Spin thermal conductivity of the Haldane chain compound Y2BaNiO5
K. Kordonis, A. V. Sologubenko, T. Lorenz, S. -W. Cheong, A. Freimuth
Abstract
We have measured the thermal conductivity of the spin S=1 chain compound Y2BaNiO5. Analyzing the anisotropy of the thermal transport allows to identify a definite spin-mediated thermal conductivity κs along the chain direction. The calculated spin-related energy diffusion constant DE(T) shows a broad peak around 120 K. Close to room temperature, DE(T) approaches the theoretically predicted high-temperature value, while scattering of spin excitations by magnetic impurities seems to be the major limiting factor of κs at low temperature.
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