Negative Magnetoresistance in Homogeneous Amorphous Superconducting Pb Wires

Journal Article · Sat Feb 01 04:00:00 EST 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.78.927· OSTI ID:450446

Xiong, P; Herzog, A; Dynes, R ^[1]

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1. Department of Physics, University of California, San Diego, La Jolla, California 92093 (United States)

We report systematic magnetotransport measurements on a series of {ital 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 {ital negative} magnetoresistance (MR) below the mean-field T{sub c} at low fields. Both the magnitude of the negative MR and the crossover field increase with decreasing T{sub c} 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. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 450446
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 5 Vol. 78; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AMORPHOUS STATE
LEAD
MAGNETORESISTANCE
SUPERCONDUCTING WIRES
TEMPERATURE DEPENDENCE