Superconducting fluctuation magnetoconductance in a tungsten carbide film

Ralph Rosenbaum, Shih Ying Hsu, Jing Yin Chen, Yong Han Lin, Juhn Jong Lin

Research output: Contribution to journalArticlepeer-review


Magnetoconductance (MC) measurements have been performed on a 2140 Å thick tungsten carbide film at temperatures very close to the superconducting transition temperature Tc of the film. The data are dominated by superconducting fluctuations. A novel three-dimensional phenomenological model is proposed to explain the MC data, yielding good fits. The Larkin beta factor, ΒLarkin, appeared as a fitting parameter. An expression proposed by Larkin for βLarkin failed badly for temperatures extremely close to Tc. But at intermediate and high temperatures compared to Tc, Larkin's expression gave very good agreement in fits to the MC data. At temperatures very close to Tc, a crossover from three dimensions to two dimensions was observed in the behaviour of the MC of the film.

Original languageEnglish
Pages (from-to)10041-10056
Number of pages16
JournalJournal of Physics Condensed Matter
Issue number44
StatePublished - 5 Nov 2001


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