Large magnetic heat transport in a Haldane chain material Ni(C$_3H_{10}N_2)_2NO_2ClO_4
arXiv:1212.4725 · doi:10.1063/1.4796180
Abstract
We report a study on the heat transport of an S = 1 Haldane chain compound Ni(C_3H_{10}N_2)_2NO_2ClO_4 at low temperatures and in magnetic fields. The zero-field thermal conductivities show a remarkable anisotropy for the heat current along the spin-chain direction (κ_b) and the vertical direction (κ_c), implying a magnetic contribution to the heat transport along the spin-chain direction. The magnetic-field-induced change of the spin spectrum has obviously opposite impacts on κ_b and κ_c. In particular, κ_b(H) and κ_c(H) curves show peak-like increases and dip-like decreases, respectively, at \sim 9 T, which is the critical field that minimizes the spin gap. These results indicate a large magnetic thermal transport in this material.
3 pages, 2 figures, accepted for publication in J. Appl. Phys. (Proceedings of the 12th Joint MMM/Intermag Conference)