Magnetic phase transitions and linear magnetic dichroism in manganese-doped copper metaborate (Cu,Mn)B2O4

Molchanova, A. D.; Boldyrev, K. N.; Erofeev, A. S.; Moshkina, E. M.; Bezmaternykh, L. N. 4TH INTERNATIONAL SCHOOL AND CONFERENCE ON OPTOELECTRONICS, PHOTONICS, ENGINEERING AND NANOSTRUCTURES (SAINT PETERSBURG OPEN 2017), 917 10.1088/1742-6596/917/7/072003 2017

The work presents a study of manganese-doped copper metaborate (Cu,Mn)B₂O₄ using optical spectroscopy. The temperature of the antiferromagnetic phase transition T_N = 19 K has been defined according to the absorption spectra. Polarization studies (Cu,Mn)B₂O₄ in isotropic ab-plane show the presence of linear antiferromagnetic dichroism in the magnetically ordered state previously observed in pure copper metaborate CuB₂O₄. This measurement allows to find the magnetic phase transition into an elliptical structure at the temperature T* = 7.0 K.