https://doi.org/10.1140/epjb/e2004-00096-x
Thermal conductivity of doped La2CuO4 as an example for heat transport by optical phonons in complex materials
1
Département de Physique de la Matière Condensée, Université de Genève, 1211 Genève, Switzerland
2
2. Physikalisches Institut, RWTH-Aachen, 52056 Aachen, Germany
3
Leibniz-Institute for Solide State and Materials Research, IFW-Dresden, 01171 Dresden, Germany
Corresponding author: a hess@physics.unige.ch
Received:
20
October
2003
Published online:
20
April
2004
We investigate the phonon thermal conductivity 
of doped 
based on out-of-plane thermal conductivity measurements. When room temperature is approached the temperature dependence of strongly deviates from the T-1-decrease which is usually expected for heat transport by acoustic phonons. Instead, decreases much weaker or even increases with rising temperature. Simple arguments suggest that such unusual temperature dependencies of are caused by heat transport via dispersive optical phonons.
PACS: 66.70.+f – Nonelectronic thermal conduction and heat-pulse propagation in solids; thermal waves / 74.72.Dn – La-based cuprates / 44.10.+i – Heat conduction
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2004
