Spin thermal conductivity of the Haldane chain compound Y2BaNiO5

K. Kordonis; A. V. Sologubenko; T. Lorenz; S. -W. Cheong; A. Freimuth

doi:10.1103/PhysRevLett.97.115901

Spin thermal conductivity of the Haldane chain compound Y2BaNiO5

Strongly Correlated Electrons 2007-05-23 v2 Materials Science

Authors: K. Kordonis , A. V. Sologubenko , T. Lorenz , S. -W. Cheong , A. Freimuth

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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 \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.

Keywords

spin thermal conductivity Haldane chain Y2BaNiO5 thermal transport energy diffusion constant spin excitations

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@article{arxiv.cond-mat/0603586,
  title  = {Spin thermal conductivity of the Haldane chain compound Y2BaNiO5},
  author = {K. Kordonis and A. V. Sologubenko and T. Lorenz and S. -W. Cheong and A. Freimuth},
  journal= {arXiv preprint arXiv:cond-mat/0603586},
  year   = {2007}
}

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4 pages, 2 figures

Spin thermal conductivity of the Haldane chain compound Y2BaNiO5

Abstract

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