Spin thermal conductivity of the Haldane chain compound Y2BaNiO5

被引：30

作者：

Kordonis, K. ^{[1
]}

Sologubenko, A. V.

Lorenz, T.

Cheong, S. -W.

Freimuth, A.

机构：

[1] Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany

[2] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.97.115901

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have measured the thermal conductivity of the spin S=1 chain compound Y2BaNiO5. 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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页数：4

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