In-plane thermal conductivity of large single crystals of Sm-substituted (Y$_{1-x}$Sm$_{x}$)Ba$_{2}$Cu$_{3}$O$_{7-δ}$

Details In-plane thermal conductivity of large single crystals of Sm-substituted (Y$_{1-x}$Sm$_{x}$)Ba$_{2}$Cu$_{3}$O$_{7-δ}$ In-plane thermal conductivity of large single crystals of Sm-substituted (Y$_{1-x}$Sm$_{x}$)Ba$_{2}$Cu$_{3}$O$_{7-δ}$

2006-02-15

arxiv.org/abs/cond-mat/0602344v2

Physics

Condensed Matter

Superconductivity

7 pages,4 figures,1 table

Scientific paper

10.1088/0953-2048/19/8/015

We have investigated the in-plane thermal conductivity $\kappa_{ab}(T,H)$ of large single crystals of optimally oxygen-doped (Y$_{1-x}$,Sm$_{x}$)Ba$_{2}$Cu$_{3}$O$_{7-\delta}$ ($x$=0, 0.1, 0.2 and 1.0) and YBa$_{2}$(Cu$_{1-y}$Zn$_{y}$)$_{3}$O$_{7-\delta}$($y$=0.0071) as functions of temperature and magnetic field (along the c axis). For comparison, the temperature dependence of $\kappa_{ab}$ for as-grown crystals with the corresponding compositions are presented. The nonlinear field dependence of $\kappa_{ab}$ for all crystals was observed at relatively low fields near a half of $T_{c}$. We make fits of the $\kappa(H)$ data to an electron contribution model, providing both the mean free path of quasiparticles $\ell_{0}$ and the electronic thermal conductivity $\kappa_{e}$, in the absence of field. The local lattice distortion due to the Sm substitution for Y suppresses both the phonon and electron contributions. On the other hand, the light Zn doping into the CuO $_{2}$ planes affects solely the electron component below $T_{c}$, resulting in a substantial decrease in $\ell_{0}$ .

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