Spin crossover in magnetic field for Cu2MnBO5:Cr

Popov, D.V., Batulin, R.G., Cherosov, M.A., (...), Fazlizhanova, D.I., Eremina, R.M.// Journal of Alloys and Compounds//

https://doi.org/10.1016/j.jallcom.2025.183213

Complex ludwigite Cu $_{2}$ MnBO $_{5}$ was doped by Cr ions in amount of 0.08 per unit cell. It demonstrates two close phase transition temperatures of 52 and 59 K into a canonical spin-glass state. It is shown that with an increase of the external magnetic field up to the magnetic field 3 T, the effective magnetic moment drops from 5.33 up to 4.38 $μ_{B}$ and Curie–Weiss temperature elevates from −70 up to −15 K. This is probably due to the transition from a high-spin state to a low-spin state for manganese ions. The magnetization, XPS and EPR spectra were measured. The temperature dependence of the specific heat in a zero magnetic field and 9T has been measured. It is shown that Einstein temperatures change in a 9T magnetic field.