Spin thermal conductivity of the haldane chain compound Y(2)BaNiO(5) |
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Authors: | Kordonis K Sologubenko A V Lorenz T Cheong S-W Freimuth A |
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Institution: | II. Physikalisches Institut, Universit?t zu K?ln, 50937 K?ln, Germany. |
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Abstract: | We have measured the thermal conductivity of the spin S=1 chain compound Y(2)BaNiO(5). Analyzing the anisotropy of the thermal transport allows us to identify a definite spin-mediated thermal conductivity kappa(s) along the chain direction. The calculated spin-related energy diffusion constant D(E)(T) shows a broad peak around 120 K. Close to room temperature, D(E)(T) approaches the theoretically predicted high-temperature value, while scattering of spin excitations by magnetic impurities seems to be the major limiting factor of kappa(s) at low temperature. |
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