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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