Публикации 2017

Origin of the giant circular dichroism of vibronic f-f transitions

Malakhovskii, A. V. MOLECULAR PHYSICS, 115 (14):1687-1690; Doi: 10.1080/00268976.2017.1317113 2017

Taking into account the space inhomogeneity of the light electromagnetic wave, a new quantum mechanical expression for the natural optical activity (NOA) of electron transitions has been obtained, which is consistent with the phenomenological theory. It is shown that properties of the NOA of parity forbidden f–f transitions substantially differ from those of allowed transitions. The experimentally observed large NOA of the f–f transitions and extremely large (close to unity) NOA of vibrational repetitions of the f–f transitions are qualitatively explained on the basis of the obtained theoretical expression.

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BIOMEDICAL APPLICATION OF BIOGENIC FERRIHYDRITE NANOPARTICLES

Chilom, C. G.; Gazdaru, D. M.; Balasoiu, M.; Bacalum, M.; Stolyar, S. V.; Popescu, A. I. ROMANIAN JOURNAL OF PHYSICS, 62 (3-4):2017

Magnetic Properties of Co-2 2+Co1-x3+Fex3+ BO5 (x=0.10) Single Crystals with a Ludwigite Structure

Knyazev, Yu. V.; Kazak, N. V.; Bayukov, O. A.; Platunov, M. S.; Velikanov, D. A.; Bezmaternykh, L. N.; Ivanova, N. B.; Ovchinnikov, S. G. JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS, 124 (4):623-627; Doi: 10.1134/S106377611703013X APR 2017

The investigation of mixed Co–Fe ludwigite single crystals shows that their magnetic properties are close to the magnetic properties of Fe3BO5 despite the predominance of cobalt ions. The magnetic properties of Co3 – xFexBO5 single crystals with x = 0.10 are studied in detail. Magnetometric measurements demonstrate a strong magnetic anisotropy with easy magnetization axis b, and the orbital magnetic moment of cobalt is in a frozen state. The detected temperature dependence of the absorption of Mössbauer spectra allowed us to determine the magnetic ordering temperature, which agrees with the results of magnetization measurements (TC = 84 K).

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GENERALIZED KONDO LATTICE MODEL AND ITS SPIN-POLARON REALIZATION BY THE PROJECTION METHOD FOR CUPRATES

Valkov, V. V.; Dzebisashvili, D. M.; Barabanov, A. F. THEORETICAL AND MATHEMATICAL PHYSICS, 191 (2):752-763; Doi: 10.1134/S0040577917050142 MAY 2017

The spin–fermion model, which is an effective low-energy realization of the three-band Emery model after passing to the Wannier representation for the px and py orbitals of the subsystem of oxygen ions, reduces to the generalized Kondo lattice model. A specific feature of this model is the existence of spin-correlated hoppings of the current carriers between distant cells. Numerical calculations of the spectrum of spin-electron excitations highlight the important role of the long-range spin-correlated hoppings.

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Phase formation of (Y,Ce)(2)BaAl4SiO12 yellow microcrystal-glass phosphor for blue LED pumped white lighting

Ji, Haipeng; Cho, Yujin; Wang, Le; Hirosaki, Naoto; Molokeev, Maxim S.; Huang, Zhaohui; Xie, Rong-Jun CERAMICS INTERNATIONAL, 43 (8):6425-6429; Doi: 10.1016/j.ceramint.2017.02.055 JUN 1 2017

The (Y,Ce)2BaAl4SiO12 phosphor, a garnet-structured blue-to-yellow color convertor for WLED, exhibits an interesting “microcrystal-glass powder” feature, which can be regarded as the 4th form for phosphor, in addition to the “ceramic powder phosphor”, the “single crystal phosphor” and the “glass-ceramic phosphor”. The structure exhibits luminescent microcrystals embedding in non-luminescent glass matrix: the spherical crystals are mainly arranged around the glass phase forming a “necklace” pattern, while the individual crystals show a “core-shell” architecture regarding the luminescence intensity variation. Further combining the phase evolution evidence evaluated by Rietveld refinement, we propose the formation mechanism for such unique morphology/structure as a two-stage process, including an initial nucleation by solid state reaction and following liquid-assisted crystal growth, instead of a precipitation-crystallization process.

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Coherent control of light-pulse propagation in a Raman induced grating

Arkhipkin, V. G.; Myslivets, S. A. JOURNAL OF OPTICS, 19 (5): Doi: 10.1088/2040-8986/aa6498 MAY 2017

We study light-pulse propagation in a dynamically controllable periodic structure (grating) resulting from Raman interaction of a weak probe pulse with a standing-wave pump and a second control laser field in N-type four-level atomic media. The grating is induced due to periodic spatial modulation of the Raman gain in a standing pump field (Raman gain grating). We show that it is possible to control both the probe pulse amplitude and the group velocity of the pulse from subluminal to superluminal by varying the pump or control field. Such a grating is of interest for all-optical switches and transistors.

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Alignment of liquid crystals by polymers with residual amounts of solvents

Parshin, Alexander M.; Zyryanov, Victor Y.; Shabanov, Vasily F. SCIENTIFIC REPORTS, 7 Doi: 10.1038/s41598-017-03243-5 JUN 8 2017

The homogeneous nematic layers in liquid crystal cells with treated surfaces are affected by orientational transitions in the electric, magnetic, or temperature fields. The liquid crystal structures formed on solid or liquid surfaces find limited application in identifying the liquid-crystal states by the textures observed in polarized light. The use of surfaces prepared from polymer solutions makes it possible to significantly broaden the range of application of the liquid crystal structures. We investigate the structures with the continuous transformation of the nematic director orientation from radial to planar, which were formed by the polycarbonate surface in the presence of different residual solvents. The structures contained the disclination lines that aligned either by a plate rubbed to provide the homogeneous planar orientation in the LC layer or by a magnetic field applied along the polycarbonate film during the structure formation. The orientational transitions caused by surface treatment, temperature, and electric or magnetic fields in these structures are observed. The comparison of temperature critical distance as well as electric and magnetic coherence lengths with equilibrium length calculated from the expression for the free energy of the nematic is performed. The electro-optical characteristics of the nematic structures are obtained.

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Particularities of the Magnetic State of CuO Nanoparticles Produced by Low-Pressure Plasma Arc Discharge

Lepeshev, A. A.; Karpov, I. V.; Ushakov, A. V.; Balaev, D. A.; Krasikov, A. A.; Dubrovskiy, A. A.; Velikanov, D. A.; Petrov, M. I. JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, 30 (4):931-936; Doi: 10.1007/s10948-016-3885-4 APR 2017

Copper oxide nanoparticles were produced by direct plasmachemical synthesis in a plasma arc discharge of low pressure. The formation of CuO nanoparticles with an average size of 12 nm and narrow size distribution intervals was determined by using the x-ray diffraction analysis and TEM microscopy methods. It was defined by using a vibration magnetometer and a SQUID magnetometer, that the magnetic properties of CuO nanoparticles with such size were extremely different from the magnetic properties of bulk antiferromagnetic CuO. Structural defects caused the formation of a ferromagnetic state, remaining at least up to the room temperature. The temperature of corresponding antiferromagnetic ordering was significantly decreased (down to ∼ 100 K). Meanwhile, some of the copper surface spins showed a spin-glass behavior at low temperatures.

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Thermal limiting effects in optical plasmonic waveguides

Ershov, A. E.; Gerasimov, V. S.; Gavrilyuk, A. P.; Karpov, S. V.; Zakomirnyi, V. I.; Rasskazov, I. L.; Polyutov, S. P. JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER, 191 1-6; Doi: 10.1016/j.jqsrt.2017.01.023 APR 2017

We have studied thermal effects occurring during excitation of optical plasmonic waveguide (OPW) in the form of linear chain of spherical Ag nanoparticles by pulsed laser radiation. It was shown that heating and subsequent melting of the first irradiated particle in a chain can significantly deteriorate the transmission efficiency of OPW that is the crucial and limiting factor and continuous operation of OPW requires cooling devices. This effect is caused by suppression of particle's surface plasmon resonance due to reaching the melting point temperature. We have determined optimal excitation parameters which do not significantly affect the transmission efficiency of OPW.

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Phase formation sequence, magnetic and structural development during solid-state reactions in 72Pt/28fcc-Co (001) thin films

Myagkov, V. G.; Bykova, L. E.; Zhigalov, V. S.; Matsynin, A. A.; Velikanov, D. A.; Bondarenko, G. N. JOURNAL OF ALLOYS AND COMPOUNDS, 706 447-454; Doi: 10.1016/j.jallcom.2017.02.261 JUN 5 2017

The phase formation sequence during the thermally induced solid-state reaction between polycrystalline Pt and epitaxial fcc-Co (001) films in the Pt/fcc-Co(001) bilayers are systematically examined using X-ray diffraction and magnetic measurements. The films have nominal atomic ratio Co:Pt = 28:72 and total thickness 300–400 nm. Annealing to the temperature of 375 °C does not change the structural and magnetic properties of the films; this is indicative of the absence of considerable mixing at the Co/Pt interface. With the subsequent increase of the annealing temperature, the phase formation in the Pt/fcc-Co(001) bilayers has been found to have two temperature (375 °C–575 °C and 575 °C–825 °C) intervals. Solid-state reaction between Pt and Co starts above 375 °C, and nanoclusters containing the ordered L10 phase epitaxially intergrow with the disordered A1 phase of the composition CoPt3 form and exist in the first temperature interval. The distinctive feature of the first interval is the formation of in-plane rotatable magnetic anisotropy. In the second temperature interval, the (L10 + A1) two-phase mixture grows into the ordered L12-CoPt3 phase leading to the disappearance of rotatable anisotropy. Possible origin of the rotatable magnetic anisotropy is discussed. The first magnetocrystalline anisotropy constant of L12-CoPt3 has the maximum value of −5.0·105egr/cm3 and order parameter 0.55 at 675 °C. A careful analysis of thin film solid-state reactions implies the existence of low-temperature transformation (∼375 °C) on the Pt-rich side of the Co-Pt system.

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Effect of magnetic field orientation and disorder on Majorana polarization in wires with topological superconductivity

Val'kov, V. V.; Aksenov, S. V. LOW TEMPERATURE PHYSICS, 43 (4):437-441; Doi: 10.1063/1.4983331 APR 2017

Majorana polarization, previously introduced by Sticlet et al. [Phys. Rev. Lett. 108, 096802 (2012)], is studied for wires in a topological superconductive state with varying orientation of the magnetic field. Numerical calculations show that in the case of a canted field, this polarization can differ in sign, as well as absolute magnitude, at the opposite ends of a wire. Since the Majorana polarization changes sign at one end when the orientation of the magnetic field is changed from perpendicular to longitudinal, there is always a range of angles for which this quantity is significantly suppressed or equals zero. Thus, the Majorana polarization does not always appear as a local order parameter for an arbitrary angle of the magnetic field in the plane perpendicular to the effective Rashba spin-orbital interaction field. It is shown that the introduction of disorder does not lead to qualitatively new effects. At the same time, additional regions with weak Majorana polarization do show up in high magnetic fields.

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Hyperbolic Carbon Nanoforest for Phase Matching of Ordinary and Backward Electromagnetic Waves: Second Harmonic Generation

Popov, Alexander K.; Nefedov, Igor S.; Myslivets, Sergey A. ACS PHOTONICS, 4 (5):1240-1244; Doi: 10.1021/acsphotonics.7b00146 MAY 2017

We show that a deliberately engineered dispersive metamaterial slab can enable the coexistence and phase matching of ordinary fundamental and contra-propagating backward second harmonic electromagnetic waves. Energy flux and phase velocity are contra-directed in the backward waves, which is the extraordinary phenomenon that gives rise to unique nonlinear optical propagation processes. We demonstrate that frequencies, phase, and group velocities, as well as the losses inherent to the guided electromagnetic modes supported by such metamaterial, can be tailored to maximize the conversion of frequencies and to reverse the propagation direction of the generated second harmonic wave. Such a possibility, which is of paramount importance for nonlinear photonics, is proven using a numerical model describing the hyperbolic metamaterial made of carbon nanotubes standing on the metal surface. Extraordinary properties of the backward-wave second harmonic generation in the reflection direction and of the corresponding frequency doubling metareflector in the THz are investigated with a focus on the pulsed regime.

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Microwave synthesis and spectroscopic properties of ternary scheelite-type molybdate phosphors NaSrLa(MoO4)(3):Er3+, Yb3+

Lim, Chang Sung; Aleksandrovsky, Aleksandr S.; Molokeev, Maxim S.; Oreshonkov, Aleksandr S.; Atuchin, Victor V. JOURNAL OF ALLOYS AND COMPOUNDS, 713 156-163; Doi: 10.1016/j.jallcom.2017.04.060 AUG 5 2017

Ternary scheelite-type molybdate NaSrLa(1-x-y)(MoO4)3:xEr3+,yYb3+ (x = y = 0, x = 0.1 and y = 0.2, x = 0.05 and y = 0.45, x = 0.2 and y = 0) phosphors were successfully synthesized by the microwave sol-gel method for the first time. Well-crystallized particles formed after the heat-treatment at 900 °C for 16 h showed a fine and homogeneous morphology with a particle size of 2–3 μm. The crystal structures were refined by the Rietveld method in space group I41/a. The optical properties were examined comparatively using photoluminescence emission and Raman spectroscopy. Under the excitation at 980 nm, the NaSrLa0.7(MoO4)3:0.1Er3+,0.2Yb3+ and NaSrLa0.5(MoO4)3:0.05Er3+,0.45Yb3+ particles exhibited a strong 525-nm emission band, a weaker 550-nm emission band in the green region and weak 655-nm, 490-nm and 410-nm emission bands in the red, blue and violet regions. The pump power dependence and Commission Internationale de L'Eclairage chromaticity of the upconversion emission intensity were evaluated in detail. The presence of Sr in NaSrLa(MoO4)3, in comparison with NaCaLa(MoO4)3 compound, leads to frequency shift mainly in the low region of Raman spectra. The MoO4 bending vibrations are most susceptible to changes in the distance between the nearest oxygen atoms in the nearest neighboring MoO4 groups.

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Director configurations in nematic droplets with tilted surface anchoring

Krakhalev, MN; Prishchepa, OO; Sutormin, VS; Zyryanov, VY LIQUID CRYSTALS, 44 (2):355-363; Doi: 10.1080/02678292.2016.1205225 JAN 2017

The polymer dispersed nematic liquid crystal (LC) with the tilted surface anchoring has been studied. The droplet orientational structures with two point surface defects – boojums and the surface ring defect – are formed within the films. The director tilt angle α = 40° ± 4° at the droplet interface and LC surface anchoring strength Ws ~ 10–6 (J m−2) have been estimated. The bipolar axes within the studied droplets of oblate ellipsoidal form can be randomly oriented are oriented randomly relatively to the ellipsoid axes as opposed to the droplets with homeotropic and tangential anchoring.

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Untwisting of the Helical Structure of Cholesteric Droplets with Homeotropic Surface Anchoring

Krakhalev, M. N.; Gardymova, A. P.; Emel'yanenko, A. V.; Liu, Jui-Hsiang; Zyryanov, V. Ya. JETP LETTERS, 105 (1):51-54; Doi: 10.1134/S002136401701012X JAN 2017

Cholesteric droplets dispersed in a polymer with homeotropic surface anchoring are studied. A director configuration with the bipolar distribution of the axis of the helix is formed in droplets. The untwisting of the helical structure (i.e., an increase in the pitch of the helix) is experimentally observed at a decrease in the size of droplets. This dependence is analyzed for liquid crystal droplets with various concentrations of the chiral addition. A proposed empirical relation describes well the correlation of the helix pitch and the size of droplets in the studied samples.

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Uniaxial mechanical stresses and their influence on the parameters of the ferroelectric phase transition in pressure-treated barium titanate

Pugachev, A. M.; Zaytseva, I. V.; Krylov, A. S.; Malinovsky, V. K.; Surovtsev, N. V.; Borzdov, Yu. M.; Kovalevsky, V. I. FERROELECTRICS, 508 (1):161-166; Doi: 10.1080/00150193.2017.1289769 2017

The dependence of the E(TO) line in Raman spectrum of a BaTiO3 powder on applied uniaxial pressure up to 14 GPa are obtained and the values of residual mechanical stresses are evaluated. The second harmonic generation technique is used to obtain the width and temperature of the cubic-to-tetragonal phase transition in the powder treated by uniaxial pressures. The interrelations between the phase transition width, temperatures, and residual mechanical stresses are established. These interrelations differ from expectations based on known hydrostatic pressure-induced effects in BaTiO3.

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Magnetic capacitance of the Gd (x) Bi1-x FeO3 thin films

Aplesnin, S. S.; Kretinin, V. V.; Panasevich, A. M.; Yanushkevich, K. I. PHYSICS OF THE SOLID STATE, 59 (4):667-673; Doi: 10.1134/S1063783417040047 APR 2017

The capacitance, inductance, and dissipation factor of the GdxBi1–xFeO3 films were measured in the temperature range of 100 K < T < 800 K in magnetic fields of up to 8 kOe at frequencies of 0.1–100 kHz. The magnetic susceptibility maxima in the low-temperature region and dependences of the relaxation time and inductance on prehistory of the films cooled in zero and nonzero magnetic fields are established. The giant increase in magnetic capacitance in the external bias electric field is found. The results obtained are explained by the domain structure transformation in external electric and magnetic fields.

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Ludwigites: From natural mineral to modern solid solutions

Sofronova, S.; Nazarenko, I. CRYSTAL RESEARCH AND TECHNOLOGY, 52 (4): Doi: 10.1002/crat.201600338 APR 2017

Ludwigites is a type of oxyborates compounds with BO3 groups, which have low-dimensional elements: stairs, zigzag walls, tapes. Such structural features influence on the physical properties of the compounds and cause charge ordering, the existence of two magnetic subsystems, ordered at different temperatures in the perpendicular direction, the quasi-one-dimensional magnetism, spin-glass state. In this survey, we have summarized all known experimental and theoretical studies and analyzed the proposed by the authors mechanisms of phase transitions in the ludwigite structure oxyborates.

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Contribution from optically excited many-electron states to the superexchange interaction in Mott-Hubbard insulators

Gavrichkov, Vladimir A.; Polukeev, Semen I.; Ovchinnikov, Sergey G. PHYSICAL REVIEW B, 95 (14): Doi: 10.1103/PhysRevB.95.144424 APR 17 2017

We investigated the effects of excited many-electron states in the optical control of the magnetic state in undoped Mott-Hubbard insulator. To derive the spin Hamiltonian in material under optical pumping one has used a many-electron approach based on the X-operator representation. Extending the projection operators approach on arbitrary energy spectra of the Mott-Hubbard insulator, we obtained the Hamiltonian of superexchange interaction in analytical form. The Hamiltonian includes the spin-exciton variables which are usually missing in discussion on the magnetic response to optical pumping. The superexchange is also not additive over contributions from the ground and optical excited states, and nonzero contributions to the Dzyaloshinskii-Moriya interaction are induced in insulators with different spins at the ground and excited cell states. As a test, a microscopic background for the optical induced superexchange was analyzed in La2CuO4 (further La214) and FeBO3 with spins 1/2 and 5/2, respectively.

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Bifurcations of Coupled Electron-Phonon Modes in an Antiferromagnet Subjected to a Magnetic Field

Boldyrev, K. N.; Stanislavchuk, T. N.; Sirenko, A. A.; Kamenskyi, D.; Bezmaternykh, L. N.; Popova, M. N. PHYSICAL REVIEW LETTERS, 118 (16): Doi: 10.1103/PhysRevLett.118.167203 APR 18 2017

We report on a new effect caused by the electron-phonon coupling in a stoichiometric rare-earth antiferromagnetic crystal subjected to an external magnetic field, namely, the appearance of a nonzero gap in the spectrum of electronic excitations in an arbitrarily small field. The effect was registered in the low-temperature far-infrared (terahertz) reflection spectra of an easy-axis antiferromagnet PrFe3(BO3)4 in magnetic fields Bextc. Both paramagnetic and magnetically ordered phases (including a spin-flop one) were studied in magnetic fields up to 30 T, and two bifurcation points were observed. We show that the field behavior of the coupled modes can be successfully explained and modeled on the basis of the equation derived in the framework of the theory of coupled electron-phonon modes, with the same field-independent electron-phonon interaction constant |W|=14.8cm1.

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The Pockels effect in TmAl3(BO3)(4)

Bedarev, V. A.; Merenkov, D. N.; Pashchenko, M. I.; Gnatchenko, S. L.; Gudim, I. A.; Bezmaternykh, L. N.; Temerov, V. L. FERROELECTRICS, 506 (1):152-158; Doi: 10.1080/00150193.2017.1282298 2017

The Pockels effect was studied in TmAl3(BO3)4 crystal. The electro-optic coefficient of the compound was determined. The principal refractive indexes of the crystal were determined by measuring the Brewster angles. Both contributions to the electric field induced birefringence associated with the redistribution of connected charges and deformation were estimated.

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Small-Angle Light Scattering Symmetry Breaking in Polymer-Dispersed Liquid Crystal Films with Inhomogeneous Electrically Controlled Interface Anchoring

Loiko, V. A.; Konkolovich, A. V.; Zyryanov, V. Ya.; Miskevich, A. A. JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS, 124 (3):388-405; Doi: 10.1134/S1063776117020133 MAR 2017

We have described the method of analyzing and reporting on the results of calculation of the small-angle structure of radiation scattered by a polymer-dispersed liquid crystal film with electrically controlled interfacial anchoring. The method is based on the interference approximation of the wave scattering theory and the hard disk model. Scattering from an individual liquid crystal droplet has been described using the anomalous diffraction approximation extended to the case of droplets with uniform and nonuniform interface anchoring at the droplet–polymer boundary. The director field structure in an individual droplet is determined from the solution of the problem of minimizing the volume density of the free energy. The electrooptical effect of symmetry breaking in the angular distribution of scattered radiation has been analyzed. This effect means that the intensities of radiation scattered within angles +θs and–θs relative to the direction of illumination in the scattering plane can be different. The effect is of the interference origin and is associated with asymmetry of the phase shift of the wavefront of an incident wave from individual parts of the droplet, which appears due to asymmetry of the director field structure in the droplet, caused by nonuniform anchoring of liquid crystal molecules with the polymer on its surface. This effect is analyzed in the case of normal illumination of the film depending on the interfacial anchoring at the liquid crystal–polymer interface, the orientation of the optical axes of droplets, their concentration, sizes, anisometry, and polydispersity.

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Chiral Optical Tamm States: Temporal Coupled-Mode Theory

Timofeev, Ivan V.; Pankin, Pavel S.; Vetrov, Stepan Ya.; Arkhipkin, Vasily G.; Lee, Wei; Zyryanov, Victor Ya. CRYSTALS, 7 (4): Doi: 10.3390/cryst7040113 APR 2017

The chiral optical Tamm state (COTS) is a special localized state at the interface of a handedness-preserving mirror and a structurally chiral medium such as a cholesteric liquid crystal or a chiral sculptured thin film. The spectral behavior of COTS, observed as reflection resonances, is described by the temporal coupled-mode theory. Mode coupling is different for two circular light polarizations because COTS has a helical structure replicating that of the cholesteric. The mode coupling for co-handed circularly polarized light exponentially attenuates with the cholesteric layer thickness since the COTS frequency falls into the stop band. Cross-handed circularly polarized light freely goes through the cholesteric layer and can excite COTS when reflected from the handedness-preserving mirror. The coupling in this case is proportional to anisotropy of the cholesteric and theoretically only anisotropy in magnetic permittivity can ultimately cancel this coupling. These two couplings being equal result in a polarization crossover (the Kopp–Genack effect) for which a linear polarization is optimal to excite COTS. The corresponding cholesteric thickness and scattering matrix for COTS are generally described by simple expressions.

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Theoretical investigation of magnetic properties in interfaces of magnetic nanoparticles and amorphous carbons

Sun, Shih-Jye; Hsu, Hua-Shu; Ovchinnikov, Sergei; Chen, Guan-Long JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 432 102-105; Doi: 10.1016/j.jmmm.2017.02.001 JUN 15 2017

Based on the experimental finding of the exchange bias in amorphous carbon samples with embedded Co nanoparticles and on the graphited character of the amorphous carbon interface confirmed by molecular dynamics simulations we have proposed the interface of graphited carbon to be antiferromagnetic. A theoretical model, which comprises the Kondo interactions in the interfaces of Co nanoparticles and the induced antiferromagnetic interactions in the graphited carbons, is employed to evaluate the ferromagnetism of the interfaces of Co nanoparticles. We have shown that the ferromagnetism of interfaces of Co nanoparticles will be enhanced by the increase of antiferromagnetic interaction as well as the increase of electron density in the graphited carbons. In particular, we found that the antiferromagnetic interactions in graphited carbons will change the spin-wave excitation in interfaces of Co nanoparticles from the quasiacoustic mode to the quasioptical one.

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Thermal, Optical, and Dielectric Properties of Fluoride Rb2TaF7

Pogorel'tsev, E. I.; Mel'nikova, S. V.; Kartashev, A. V.; Gorev, M. V.; Flerov, I. N.; Laptash, N. M. PHYSICS OF THE SOLID STATE, 59 (5):986-991; Doi: 10.1134/S1063783417050250 MAY 2017

The thermal, optical, and dielectric properties of fluoride Rb2TaF7 were investigated. It was observed that the variation in chemical pressure in fluorides A2+TaF7 caused by the cation substitution of rubidium for ammonium does not affect the ferroelastic nature of structural distortions, but leads to stabilization of the high- and low-temperature phases and enhancement of birefringence. The entropy of the phase transition P4/nmmCmma is typical of the shift transformations, which is consistent with a model of the initial and distorted phase structures. The anisotropy of chemical pressure causes the change of signs of the anomalous strain and baric coefficient dT/dp of Rb2TaF7 as compared with the values for its ammonium analog.

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Magnetic structure of Cu2MnBO5 ludwigite: thermodynamic, magnetic properties and neutron diffraction study

Moshkina, Evgeniya; Ritter, Clemens; Eremin, Evgeniy; Sofronova, Svetlana; Kartashev, Andrey; Dubrovskiy, Andrey; Bezmaternykh, Leonard JOURNAL OF PHYSICS-CONDENSED MATTER, 29 (24): Doi: 10.1088/1361-648X/aa7020 JUN 21 2017

We report on the thermodynamic, magnetic properties and the magnetic structure of ludwigite-type Cu2MnBO5. The specific heat, low-field magnetization and paramagnetic susceptibility were studied on a single crystal and combined with powder neutron diffraction data. The temperature dependence of the specific heat and the neutron diffraction pattern reveal a single magnetic phase transition at T  =  92 K, which corresponds to the magnetic ordering into a ferrimagnetic phase. The cation distribution and the values and directions of magnetic moments of ions in different crystallographic sites are established. The magnetic moments of Cu2+ and Mn3+ ions occupying different magnetic sites in the ferrimagnetic phase are pairwise antiparallel and their directions do not coincide with the directions of the principal crystallographic axes. The small value of the magnetic moment of copper ions occupying site 2a is indicative of partial disordering of the magnetic moments on this site. The magnetization measurements show a strong temperature hysteresis of magnetization, which evidences for field-dependent transitions below the phase transition temperature.

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The optical Tamm states at the edges of a photonic crystal bounded by one or two layers of a strongly anisotropic nanocomposite

Vetrov, S. Ya.; Bikbaev, R. G.; Timofeev, I. V. OPTICS COMMUNICATIONS, 395 275-281; SI Doi: 10.1016/j.optcom.2016.08.075 JUL 15 2017

The optical Tamm states localized at the edges of a photonic crystal bounded by a nanocomposite on its one or both sides are investigated. The nanocomposite consists of metal nanoinclusions with an orientation-ordered spheroidal shape, which are dispersed in a transparent matrix, and is characterized by the effective resonance permittivity. The spectrum of transmission of the longitudinally and transversely polarized waves by such structures at the normal incidence of light was calculated. The spectral manifestation of the Tamm states caused by negative values of the real part of the effective permittivity in the visible spectral range was studied. Features of the spectral manifestation of the optical Tamm states for different degrees of extension of spheroidal nanoparticles and different periods of a photonic crystal were investigated. It is demonstrated that splitting of the frequency due to elimination of degeneracy of the Tamm states localized at the interfaces between the photonic crystal and nanocomposite strongly depends on the volume fraction of the spheroids in the nanocomposite and on the ratio between the polar and equatorial semiaxes of the spheroid. Each of the two orthogonal polarizations of the incident wave has its own dependence of splitting on the nanoparticle density, which makes the transmission spectra polarization-sensitive. It is shown that the Tamm state is affected by the size-dependent permittivity of anisotropic nanoparticles.

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Hybrid States Formed by the Optical Tamm and Defect Modes in a One-dimensional Photonic Crystal

Pankin, P. S.; Vetrov, S. Ya.; Timofeev, I. V. PROGRESS IN ELECTROMAGNETICS RESEARCH SYMPOSIUM (PIERS), 4571-4574; 2016 Unique ID: WOS:000400013904043

Temperature and Texture Dependent Spectroscopic Dielectric Model for Frozen Mineral Soils at 0.1-15GHz

Mironov, V. L.; Karavaysky, A. Y.; Molostov, I. P.; Lukin, Y. I.; Kosolapova, L. G. PROGRESS IN ELECTROMAGNETICS RESEARCH SYMPOSIUM (PIERS), 4754-4754; 2016 Unique ID: WOS:000400013904097

Temperature Dependence of SMOS/MIRAS, GCOM-W1/AMSR2 Brightness Temperature and ALOS/PALSAR Radar Backscattering at Arctic Test Sites

Muzalevskiy, K. V.; Ruzicka, Z.; Kosolapova, L. G.; Mironov, V. L. PROGRESS IN ELECTROMAGNETICS RESEARCH SYMPOSIUM (PIERS), 3578-3582; 2016. Unique ID: WOS:000400013903065