9.
CuB
2O
4 single crystals have been grown and their magnetic and resonance properties have been investigated for the first time. The
temperature dependence of the susceptibility was found to contain features at
T=21 and 10 K. The CuB
2O
4 single crystal transformed at
T=21 K to a weakly ferromagnetic state. The sharp drop in susceptibility at
T<10 K is caused by a transition of the magnetic system of CuB
2O
4 to an antiferromagnetic state. The effective magnetic moment of the Cu
2+ ion, determined from the high-temperature part of the magnetic susceptibility, is 1.77
μ
B. The room-temperature
g factors are, respectively, 2.170 and 2.133 for magnetic field parallel and perpendicular to the
c axis of the crystal. The antiferromagnetic resonance parameters in the weakly ferromagnetic and antiferromagnetic phases
were measured.
Fiz. Tverd. Tela (St. Petersburg)
41, 1267–1271 (July 1999)
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