Abstract
The superconducting property in impurity-doped YBa 2(Cu 1− x M x ) 3O 7 (M=Zn and Ni) has been investigated by measuring the nuclear spin-lattice relaxation time T 1 and the Knight shift of 63Cu in the CuO 2 plane. We have found that Zn doping into the CuO 2 plane in YBa 2Cu 3O 7 causes gapless superconductivity at low T, giving rise to a finite density of states at the Fermi surface, while magnetic Ni doping into the CuO 2 plane reduces T c moderately, although Ni spins behave as local moments. The gapless feature in Zn-doped YBCo 7 can be consistently interpreted in the framework of the d-wave model with gap zeros of lines at the Fermi surface, as argued for heavy-fermion superconductors.
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