Hall conductivity dominated by fluctuations near the superconducting transition in disordered thin films

Nicholas P. Breznay, Karen Michaeli, Konstantin S Tikhonov, Alexander M Finkel’stein, Mihir Tendulkar, and Aharon Kapitulnik

Physical Review B 86 (2012) 14514

Abstract

We have studied the Hall effect in superconducting tantalum nitride films. We find a large contribution to the Hall conductivity near the superconducting transition, which we can track to temperatures well above \( T_c \) and magnetic fields well above the upper critical field, \( \mathrm{H}_{c2}(0) \). This contribution arises from Aslamazov-Larkin superconducting fluctuations, and we find quantitative agreement between our data and recent theoretical analysis based on time dependent Ginzburg-Landau theory.

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