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Results of in-plane and out-of-plane thermal-conductivity measurements on ${\mathrm{La}}_{1.8\ensuremath{-}x}{\mathrm{Eu}}_{0.2}{\mathrm{Sr}}_{x}{\mathrm{CuO}}_{4}$ $(0l~xl~0.2)$ 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 ${T}_{\mathrm{LT}},$ 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 ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{CuO}}_{4}$ and ${\mathrm{La}}_{2}{\mathrm{NiO}}_{4}$ clearly reveals that in ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{CuO}}_{4}$ 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 ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{CuO}}_{4}.$

physical review. b, condensed matter

Phonon thermal conductivity in doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mo>:</mml:mo></mml:math>Relevant scattering mechanisms

Phonon thermal conductivity in dopedLa2CuO4:Relevant scattering mechanisms