Negative Magnetoresistance in Homogeneous Amorphous Superconducting Pb Wires

P. Xiong; A. V. Herzog; R. C. Dynes

doi:10.1103/PhysRevLett.78.927

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Negative Magnetoresistance in Homogeneous Amorphous Superconducting Pb Wires

P. Xiong, A. V. Herzog, R. C. Dynes

DOI 10.1103/PhysRevLett.78.927 · Physical Review Letters

T1

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Abstract

We report systematic magnetotransport measurements on a series of in situ grown homogeneous amorphous Pb wires. Corresponding to the broadening of the superconducting transitions as the wires cross over from 2D to 1D, we observe a negative magnetoresistance (MR) below the mean-field Tc at low fields. Both the magnitude of the negative MR and the crossover field increase with decreasing Tc and wire cross-sectional area. We speculate that these observations are the result of superfluid density fluctuations in sign as well as in magnitude along these wires close to the superconductor-insulator transition.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.63	Pressure not reported	midpoint
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.9	Pressure not reported	midpoint
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.93	Pressure not reported	midpoint
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5.78	Pressure not reported	midpoint