Heat transport of La${}_{2-y}$Eu${}_y$CuO${}_4$ and La${}_{1.88-y}$Eu${}_y$Sr${}_{0.12}$CuO${}_4$ single crystals

Abstract

To study the rare-earth doping effect on the phonon heat transport of La-based cuprates and shed light on the mechanism of phonon scattering, both $ab$-plane and c-axis thermal conductivities (${\kappa }_{ab}$ and ${\kappa }_c$) are measured for La${}_{2-y}$Eu${}_y$CuO${}_4$ ($y$ = 0, 0.02 and 0.2) and La${}_{1.88-y}$Eu${}_y$Sr${}_{0.12}$CuO${}_4$ ($y$ = 0 and 0.2) single crystals. It is found that the phonon peak (at 20 -- 25 K) in ${\kappa }_{ab}(T)$ of La${}_{2-y}$Eu${}_y$CuO${}_4$ shows an anomalous Eu-doping dependence: it completely disappears for $y$ = 0.02, which is discussed to be due to the local lattice distortions around Eu dopants, and reappears for $y$ = 0.2 with much smaller peak magnitude compared to $y$ = 0 sample. In contrast to the strong suppression of the phonon peak in Eu-doped La${}_2$CuO${}_4$, Eu-doping to La${}_{1.88}$Sr${}_{0.12}$CuO${}_4$ enhances the low-$T$ phonon heat transport that results in the reappearance of the phonon peak in this charge-carrier-doped system. The data clearly show that the establishment of static stripe phase rather than the structural change is responsible for the reappearance of phonon peak.

arXiv comment7 pages, 5 figures, final version published in Phys. Rev. B

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