Spin thermal conductivity of the haldane chain compound Y(2)BaNiO(5).
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.
Kordonis
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II. Physikalisches Institut, Universität zu Köln, 50937 Köln, Germany.
Sologubenko
A V
AV
Lorenz
T
T
Cheong
S-W
SW
Freimuth
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A