Magnon-mediated thermal conductivity in the dimerized spin-gap compound BaCu(2)V(2)O(8)

作者：Lue C S^*; Kuo C N; Tasi D S; Kuo Y K; He Zhangzhen; Itoh Mitsuru

来源：Physical Review B, 2008, 78(1): 012406.

DOI：10.1103/PhysRevB.78.012406

We have measured the thermal conductivity (kappa) of the quasi-one-dimensional spin-gap compound BaCu(2)V(2)O(8) with heat flow parallel and perpendicular to the chain axis. Distinctive differences in the magnitude and temperature dependence between these directions have been observed. A weak but non-negligible contribution to kappa along the chain has been identified, attributed to the magnon heat transport. An analysis using a simple kinetic approach has been employed to rationalize this contribution. We also estimated the temperature dependent mean-free path for the magnon scattering. The result implies that the magnon-phonon scattering is a major process for the magnon-assisted kappa at intermediate temperatures.

• 出版日期2008-7
• 单位中国科学院福建物质结构研究所; 东华大学