Magnetic properties of LaCr3(BO3)4 crystal
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
National Science Center Kharkov Institute of Physics and Technology, 1 Akademicheskaya Str., Kharkiv 61108, Ukraine
V.V. Mal’tsev, N.N Kuzmin, and N.I. Leonyuk
M.V. Lomonosov Moscow State University, Moscow 119991, Russia
Received March 20, 2019, published online April 24, 2020
The magnetic susceptibility χ(Т) of two-phase (R32+C2/c) crystal LaCr3(BO3)4 in the temperature range 2–300 K for two orientations of the external magnetic field has been investigated. It is established that both phases of lanthanum chromium borate are ordered antiferromagnetically, and each phase has its own Neel temperature (6.5 and 8.5 K). It is shown that at Т > 60 K the magnetic susceptibility obeys the Curie–Weiss law with the ef-fective magnetic moment μeff = 3.86 μB/Cr3+ and Curie–Weiss temperature θ = –23 K. Within the frames of the Heisenberg model for spin chains and taking into account the interchain exchange interaction, the following exchange interaction constants were obtained: the antiferromagnetic intrachain exchange interaction J/k = 4.8 K and the ferromagnetic interchain one J'/k = –0.28 K.
Key words: antiferromagnet, low-dimensional magnetism, rare-earth chromoborate, magnetic susceptibility.