We have measured the thermal conductivity (κ) of the quasi-one-dimensional spin-gap compound BaCu2 V2 O8 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 κ 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 κ at intermediate temperatures.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2008 Jul 16|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics