Magnetic Susceptibility Study of CsCuCl₃

Abstract

Susceptibilities of single crystals of CsCuCl 3 are measured in 4.2 K< T <500 K for H ⊥ c and H // c . Behaviors characteristic to a one-dimensional Heisenberg ferromagnet with weak interchain interactions are observed. The behaviors are analyzed by the high temperature expansion approximation, and intrachain and interchain exchange interaction constants, J 0 and J 1 , are estimated. The results are, J 0 / k =(24 ±3) K and J 1 / J 0 =-0.16 ±0.04. A discontinuity in the susceptibility arising from a Jahn-Teller cooperative phase transition are observed at T t ∼420 K. The discontinuity is due to a change in J 0 at T t . Relation between the phase transition and the change of J 0 is discussed.