Magnetic properties of DyCr3(BO3)4
A.N. Bludov, Yu.O. Savina, V.A. Pashchenko, S.L. Gnatchenko
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Nauky Ave., Kharkiv 61103, Ukraine
T. Zajarniuk, A. Lynnyk, M.U. Gutowska, A. Szewczyk
Institute of Physics, Polish Academy of Sciences, Warsaw 02-668, Poland
National Science Center Kharkov Institute of Physics and Technology, 1 Akademicheskaya Str., Kharkiv 61108, Ukraine
V.V. Mal’tsev, N.N. Kuzmin, N.I. Leonyuk
M.V. Lomonosov Moscow State University, Moscow 119991, Russia
Received April 16, 2020, published online May 26, 2020
Structural, magnetic, and thermal studies of DyCr3(BO3)4 were carried out. Structural studies showed that the sample contains two phases, the contents of the rhombohedral (R32) and monoclinic (C2/c) phases are the same within the accuracy of the method. The lattice parameters for each phase were determined (the rhombohedral: а = 9.461 Å, с = 7.488 Å; the monoclinic: а = 7.394 Å, b = 9.450 Å, с = 11.357 Å, β = 103.9°). It was found that both structural modifications of dysprosium-chromium borate are ordered antiferromagnetically, with its own Néel temper-ature (rhombohedral: ТN1 = 9.1 K, monoclinic: ТN2 = 7.5 K). Spontaneous magnetic phase transitions were detected at temperatures of 3.6; 4.6; 5.5; 5.7 К. The nature of these transitions was discussed.
Key words: dysprosium-chromium borate, spontaneous spin-orientation transition.