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We report a study on the heat transport of an S = 1 Haldane chain compoundNi(C_3H_{10}N_2)_2NO_2ClO_4 at low temperatures and in magnetic fields. Thezero-field thermal conductivities show a remarkable anisotropy for the heatcurrent along the spin-chain direction (\kappa_b) and the vertical direction(\kappa_c), implying a magnetic contribution to the heat transport along thespin-chain direction. The magnetic-field-induced change of the spin spectrumhas obviously opposite impacts on \kappa_b and \kappa_c. In particular,\kappa_b(H) and \kappa_c(H) curves show peak-like increases and dip-likedecreases, respectively, at \sim 9 T, which is the critical field thatminimizes the spin gap. These results indicate a large magnetic thermaltransport in this material.

Large magnetic heat transport in a Haldane chain material Ni(C$_3H_{10}N_2)_2NO_2ClO_4