Phonon thermal conductivity in doped $\mathbf{L}{\mathbf{a}}_2\mathbf{Cu}{\mathbf{O}}_4$: Relevant scattering mechanisms

Abstract

Results of in-plane and out-of-plane thermal conductivity measurements on $\mathrm{L}{\mathrm{a}}_{1.8-\mathrm{x}}\mathrm{E}{\mathrm{u}}_{0.2}\mathrm{S}{\mathrm{r}}_{\mathrm{x}}\mathrm{Cu}{\mathrm{O}}_4$ ($0\le x\le 0.2$) single crystals are presented. The most characteristic features of the temperature dependence are a pronounced phonon peak at low temperatures and a steplike anomaly at $T_{LT}$, i.e., at the transition to the low temperature tetragonal phase (LTT-phase), which gradually decrease with increasing Sr-content. Comparison of these findings with the thermal conductivity of $\mathrm{L}{\mathrm{a}}_{2-\mathrm{x}}\mathrm{S}{\mathrm{r}}_{\mathrm{x}}\mathrm{Cu}{\mathrm{O}}_4$ and $\mathrm{L}{\mathrm{a}}_2\mathrm{Ni}{\mathrm{O}}_4$ clearly reveals that in $\mathrm{L}{\mathrm{a}}_{2-\mathrm{x}}\mathrm{S}{\mathrm{r}}_{\mathrm{x}}\mathrm{Cu}{\mathrm{O}}_4$ the most effective mechanism for phonon scattering is impurity-scattering (dopants), as well as scattering by soft phonons that are associated with the lattice instability in the low temperature orthorhombic phase (LTO-phase). There is no evidence that stripe correlations play a major role in suppressing the phonon peak in the thermal conductivity of $\mathrm{L}{\mathrm{a}}_{2-\mathrm{x}}\mathrm{S}{\mathrm{r}}_{\mathrm{x}}\mathrm{Cu}{\mathrm{O}}_4$.

7 pages, 4 figures

References in corpus (3)

• Magnon Heat Transport in doped $\mathrm{L}{\mathrm{a}}_2\mathrm{Cu}{\mathrm{O}}_4$
• Thermal conductivity of lightly Sr- and Zn-doped La${}_2$CuO${}_4$ single crystals
• Heat transport of La${}_{2-y}$Eu${}_y$CuO${}_4$ and La${}_{1.88-y}$Eu${}_y$Sr${}_{0.12}$CuO${}_4$ single crystals

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