Spin thermal conductivity of the Haldane chain compound Y2BaNiO5
Kordonis, K. · Sologubenko, A. V. · Lorenz, T. · Cheong, S. -W. · Freimuth, A.
Original · EN
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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