Heat transport of the quasi-one-dimensional Ising-like antiferromagnet BaCo2V2O8 in longitudinal and transverse fields

Article

关键词: THERMAL-CONDUCTIVITY;    CHAIN;    EXCITATIONS;   

DOI  :  10.1103/PhysRevB.85.134412

来源: SCIE

【 摘 要 】

The very-low-temperature thermal conductivity (kappa) is studied for BaCo2V2O8, a quasi-one-dimensional Ising-like antiferromagnet exhibiting an unusual magnetic-field-induced order-to-disorder transition. The nearly isotropic transport in the longitudinal field indicates that the magnetic excitations scatter phonons rather than conduct heat. The field dependence of kappa shows a sudden drop at similar to 4 T, where the system undergoes the transition from the Neel order to the incommensurate state. Another dip at lower field of similar to 3 T indicates an unknown magnetic transition, which is likely due to the spin-flop transition. Moreover, the kappa(H) in the transverse field shows a very deep valleylike feature, which moves slightly to higher field and becomes sharper upon lowering the temperature. This indicates a magnetic transition induced by the transverse field, which however is not predicted by the present theories for this low-dimensional spin system.

【 授权许可】

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