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We have investigated the in-plane thermal conductivity $\kappa_{ab}(T,H)$ oflarge 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 functionsof temperature and magnetic field (along the c axis). For comparison, thetemperature dependence of $\kappa_{ab}$ for as-grown crystals with thecorresponding compositions are presented.  The nonlinear field dependence of $\kappa_{ab}$ for all crystals was observedat 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 meanfree path of quasiparticles $\ell_{0}$ and the electronic thermal conductivity$\kappa_{e}$, in the absence of field. The local lattice distortion due to theSm substitution for Y suppresses both the phonon and electron contributions. Onthe other hand, the light Zn doping into the CuO $_{2}$ planes affects solelythe electron component below $T_{c}$, resulting in a substantial decrease in$\ell_{0}$ .Comment: 7 pages,4 figures,1 tabl

superconductor science and technology/superconductor science and technology

In-plane thermal conductivity of large single crystals of Sm-substituted (Y1−xSmx)Ba2Cu3O7−δ