Abstract.
We investigate the phonon thermal conductivity \(\kappa_{\mathrm{ph}}\) of doped \(\rm La_2CuO_4\) based on out-of-plane thermal conductivity measurements. When room temperature is approached the temperature dependence of \(\kappa_{\mathrm{ph}}\) strongly deviates from the T -1-decrease which is usually expected for heat transport by acoustic phonons. Instead, \(\kappa_{\mathrm{ph}}\) decreases much weaker or even increases with rising temperature. Simple arguments suggest that such unusual temperature dependencies of \(\kappa_{\mathrm{ph}}\) are caused by heat transport via dispersive optical phonons.
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Received: 20 October 2003, Published online: 20 April 2004
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
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Hess, C., Büchner, B. Thermal conductivity of doped \(\mathsf{La_2CuO_4}\) as an example for heat transport by optical phonons in complex materials. Eur. Phys. J. B 38, 37–41 (2004). https://doi.org/10.1140/epjb/e2004-00096-x
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DOI: https://doi.org/10.1140/epjb/e2004-00096-x