| Issue |
Europhys. Lett.
Volume 62, Number 4, May 2003
|
|
|---|---|---|
| Page(s) | 540 - 546 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2003-00384-1 | |
| Published online | 01 May 2003 | |
Universal behavior of spin-mediated energy transport in
S=1/2 chain cuprates: 
as an example
1
Laboratorium für Festkörperphysik, ETH Hönggerberg -
CH-8093 Zürich, Switzerland
2
Laboratoire de Physico-Chimie de l'Etat Solide, Université Paris-Sud
91405 Orsay, France
Received:
27
November
2002
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
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