Universal behavior of spin-mediated energy transport in S=1/2 chain cuprates: as an example
Laboratorium für Festkörperphysik, ETH Hönggerberg -
CH-8093 Zürich, Switzerland
2 Laboratoire de Physico-Chimie de l'Etat Solide, Université Paris-Sud 91405 Orsay, France
Accepted: 11 March 2003
The thermal conductivity κ of the spin-(1/2) chain cuprate was measured along different crystallographic directions in the temperature region between 0.5 and 300. The thermal conductivity along the chain direction considerably exceeds that along perpendicular directions. Near the antiferromagnetic transition at the data indicates enhanced scattering of phonons by critical fluctuations in the spin system. A comparison of the data above with available results on similar materials reveals similarities in the main features of the temperature dependence of the mean free path of itinerant spin excitations. This universal behavior is most likely caused by the spin-lattice interaction.
PACS: 66.70.+f – Nonelectronic thermal conduction and heat-pulse propagation in solids; thermal waves / 75.40.Gb – Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.) / 75.10.Pq – Spin chain models
© EDP Sciences, 2003