Magnetic properties and electronic conduction of superconducting La2−xSrxCuO4

Abstract

Magnetic susceptibility χ and resistivity were measured in La2−xSrxCuO4. Enhancement of χ due to a ferromagnetic correlation, which is inherent 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≲x≲0.2, χ exhibits a broad peak at a temperature Tmax. The T-dependent part of χ, χs(T), follows a single curve F regardless of x when χs and T are normalized with the peak value χmaxs and Tmax, as has been reported. However, the present scaling curve F decreases much more at T≪Tmax than the reported one. The resistivity exhibits a T-linear dependence above a temperature T* and deviates downward from the T-linear dependence below T*. For x>0.1 the temperature T* agrees well with Tmax, indicating that the deviation from a T-linear resistivity is related to the decrease of χ below Tmax. On the other hand, for x<0.1 a large reduction of χ is seen below ∼T* in the data up to 1000 K by Yoshizaki et al., although no peak is seen in the χ-T curve. The T dependence of χ in La2−xSrxCu1−yZnyO4 is also reported for x=0.16 and 0.22.

Source-reported materials — not catalogue approval

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