Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2012-03-28
Phys. Rev. B 85, 134412 (2012)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 4 figures, accepted for publication in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.85.134412
The very-low-temperature thermal conductivity (\kappa) is studied for BaCo_2V_2O_8, 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 \sim 4 T, where the system unndergoes the transition from the N\'eel order to the incommensurate state. Another dip at lower field of \sim 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 valley-like 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.
Chen Ming-Lun
Fan Chang
He Zhengying
Ke W. P.
Li Jing-Qian
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