Weak localization, fluctuation, and superconductivity in thin Nb films and wires

Makoto Hikita, Yukimichi Tajima, Toshiaki Tamamura, Susumu Kurihara

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Weak localization, fluctuation conductivity, and related problems have been investigated based on a comprehensive set of experiments on transition metal Nb films and wires. The temperature dependence of the inelastic scattering rate 1/ of films with various thicknesses (25 80), estimated from magnetoresistance data above Tc, is well fitted to a function of C0+C1T+C3T3. The coefficient C1 is in excellent quantitative agreement with the theoretical prediction of the electron-electron scattering mechanism for two-dimensional dirty metals. The coefficient C3 shows no thickness dependence and is in semiquantitative agreement with theories of three-dimensional electron-phonon scattering mechanisms. The upper critical field of thin Nb wires with a width of less than 1000 exhibits unconventional temperature dependence close to Tc. We also discuss this behavior.

Original languageEnglish
Pages (from-to)118-126
Number of pages9
JournalPhysical Review B
Volume42
Issue number1
DOIs
Publication statusPublished - 1990
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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