Thermal conductivity of doped $\mathbf{L}{\mathbf{a}}_2\mathbf{Cu}{\mathbf{O}}_4$ as an example for heat transport by optical phonons in complex materials

Abstract

We investigate the phonon thermal conductivity ${\kappa }_{\mathrm{ph}}$ of doped $\mathrm{L}{\mathrm{a}}_2\mathrm{Cu}{\mathrm{O}}_4$ 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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