The Magnetic Behaviors of Quasi-Two Dimensional Antiferromagnet (CH₃NH₃)₂CuBr₄

Abstract

The temperature dependences of magnetic susceptibility and specific heat were measured for (CH₃NH₃)₂CuBr₄. The phase transition to the antiferromagnetically ordered state was observed at 15.8 K. From the angle and field dependence of magnetic susceptibility, it was revealed that the preferred axis for the spins was c-axis in this compound. The origin of the anisotropy along c-axis was discussed qualitatively.