J. Phys. Soc. Jpn. 86, 094602 (2017) [8 Pages]
FULL PAPERS

Field-Induced Transitions in Anisotropic Kondo Lattice — Application to CeT2Al10

+ Affiliations
1Department of Physics, Tohoku University, Sendai 980-8578, Japan2RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan3Institute of Materials Structure Science, KEK, Tsukuba, Ibaraki 305-0801, Japan

The magnetic properties of an anisotropic Kondo lattice are investigated under a magnetic field using dynamical mean field theory and the continuous-time quantum Monte Carlo method. The magnetic phase diagram is determined from the temperature dependence of both uniform and staggered magnetizations in magnetic fields. We find a spin-flop transition inside the antiferromagnetic (AF) phase, whose transition field increases with increasing Kondo coupling while the AF transition temperature decreases. These results cannot be described by a simple spin Hamiltonian and are consistent with the experimental results of the field-induced transition observed in CeT2Al10 (T = Ru, Os). The anisotropic susceptibilities of CeT2Al10 are reproduced in the whole temperature range by incorporating the effects of the crystalline electric field (CEF) in the anisotropic Kondo lattice. We also propose a possible explanation for the difference in anisotropies between the magnetic susceptibility and AF moments observed in experiments.

©2017 The Physical Society of Japan

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