Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 26, Issue 45, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/26/45/455701
Keywords
superconducting films and low-dimensional structures; pnictides and chalcogenides; fluctuation phenomena
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Temperature-dependent electronic transport in the vicinity of the superconducting transition is reported for quasi-two-dimensional textured FeSe thin films. The conspicuous rounding of the resistive transitions and large transition widths are indications of excess conductivity due to thermal Cooper-pair fluctuations, which can be well-described by the two-dimensional Aslamazov-Larkin theory. The Halperin-Nelson form of the sheet resistance between the phase-ordering temperature TBKT and the mean-field temperature TMF, and the power-law behaviour of the voltage-current characteristics, with a distinctive jump of the exponent at TBKT, are indicative of a Berezinskii-Kosterlitz-Thouless transition. The complementary results suggest a two-dimensional character of superconductivity in the FeSe films and allow a quantitative estimate of the Ginzburg number Gi.
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