MAGNETIC-PROPERTIES AND ELECTRONIC CONDUCTION OF SUPERCONDUCTING LA2-XSRXCUO4

Magnetic susceptibility chi and resistivity were measured in La2-xSrxC uO4. Enhancement of chi due to a ferromagnetic correlation, which is i nherent in the orthorhombic phase at low Sr concentrations, disappears at around x = 0.05, near the margin of the superconducting regime. In superconducting samples with 0.1 less than or similar x less than or similar 0.2, chi exhibits a broad peak at a temperature T(max). The T- dependent part of chi, chi(s)(T), follows a single curve F regardless of x when chi(s) and T are normalized with the peak value chi(max)s an d T(max), as has been reported. However, the present scaling curve F d ecreases much more at T much less than T(max) than the reported one. T he resistivity exhibits a T-linear dependence above a temperature T a nd deviates downward from the T-linear dependence below T. For x > 0. 1 the temperature T agrees well with T(max), indicating that the devi ation from a T-linear resistivity is related to the decrease of chi be low T(max). On the other hand, for x < 0.1 a large reduction of chi is seen below approximately T in the data up to 1000 K by Yoshizaki et al., although no peak is seen in the chi-T curve. The T dependence of chi in La2-xSrxCu1-yZnyO4 is also reported for x = 0.16 and 0.22.