Abstract
The in-plane thermal conductivity ( κ ab ) of single crystals of YBa 2(Cu 1− x Zn x ) 3O y (Zn-doped YBCO) has been studied as functions of temperature and magnetic field. The κ ab value of pure YBCO shows a rapid enhancement below T c but a small amount of Zn doping into the CuO 2 plane suppresses dramatically the observed superconducting enhancement in κ ab . The thermal conductivity value of the Zn-doped crystals exhibits the weak field dependence compared with that of pure crystals. The κ ab behavior of pure and Zn-doped YBCO in the superconducting state has been discussed on the basis of the carrier–carrier scattering model.
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