Weak localization, fluctuation, and superconductivity in thin Nb films and wires
Makoto Hikita, Yukimichi Tajima, Toshiaki Tamamura, Susumu Kurihara
DOI 10.1103/PhysRevB.42.118 · Physical Review B
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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/τφ of films with various thicknesses (25–80 Å), 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 Å exhibits unconventional temperature dependence close to Tc. We also discuss this behavior.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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