NORMAL AND SUPERCONDUCTIVE PROPERTIES OF ZN-SUBSTITUTED SINGLE-CRYSTAL YBA2(CU1-XZNX)3O7-DELTA

Zn-impurity-induced anisotropy reduction of superconductivity is obtai ned from a resistive transition analysis of single-crystal YBa2(Cu1-xZ nx)3O7-delta. The out-of-plane resistivity (rho(c)) increases with Zn doping, while the carrier concentration remains almost unchanged. The results are not consistent with the simple Lawrence-Doniach model. Ins tead, an anisotropic three-dimensional metal model seems to be promisi ng. A Zeeman-contribution-subtracted magnetoresistance analysis indica tes that a Zn impurity does not cause any magnetic pair breaking.