Magnetoresistance as a probe of superconducting islands in La-Sr-Cu-O

C. Uher; A. B. Kaiser

doi:10.1103/PhysRevB.37.127

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Magnetoresistance as a probe of superconducting islands in La-Sr-Cu-O

C. Uher, A. B. Kaiser

DOI 10.1103/PhysRevB.37.127 · Physical Review B

T1

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Abstract

We have measured a large magnetoresistance below a temperature of 35 K in a La2−xSrxCuO4 (x=0.1) sample, which shows no zero-resistance state and has a resistivity following the Mott hopping law at low temperatures. A magnetoresistance of comparable magnitude is seen below 38 K in high-Tc (x=0.2 and 0.25) samples. These observations suggest that the magnetoresistance detects superconducting islands in the x=0.1 sample, and that the main difference as Sr concentration varies is a change in the connectivity of the superconducting network rather than in its intrinsic occurrence. At the same time, the thermopower decreases as temperature decreases with no detectable anomaly.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	zero_resistance
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	15	Pressure not reported	zero_resistance
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	35	Pressure not reported	onset