Magnon heat transport in (Sr,Ca,La)14Cu24O41 -: art. no. 184305

被引：199

作者：

Hess, C ^{[1
]}

Baumann, C

Ammerahl, U

Büchner, B

Heidrich-Meisner, F

Brenig, W

Revcolevschi, A

机构：

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

[2] Rhein Westfal TH Aachen, Inst Phys 2, D-52056 Aachen, Germany

[3] Tech Univ Braunschweig, Inst Theoret Phys, D-38106 Braunschweig, Germany

[4] Univ Paris 11, Lab Physicochim, F-91405 Orsay, France

来源：

PHYSICAL REVIEW B | 2001年 / 64卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.64.184305

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have measured the thermal heat conductivity kappa of the compounds Sr14Cu24O41 and Ca9La5Cu24O41 containing doped and undoped spin ladders, respectively. We find a huge anisotropy of both, the size and the temperature dependence of kappa that we interpret in terms of a very large heat conductivity due to the magnetic excitations of the one-dimensional spin ladders. This magnon heat conductivity decreases with increasing hole doping of the ladders. Magnon heat transport is analyzed theoretically using a simple kinetic model. From this analysis we determine the spin gap and the temperature-dependent mean free path of the magnons, which measures about several thousand angstrom at low temperature. The relevance of several scattering channels for the magnon transport is discussed.

引用

页数：6

共 36 条

[1] Interplay between magnetism, charge localization, and structure in Sr14-xCaxCu24O41 [J].