Microscopic free energy functional of superconductive amplitude and phase: Superfluid density in disordered superconductors

Mandal, SS and Ramakrishnan, TV (2020) Microscopic free energy functional of superconductive amplitude and phase: Superfluid density in disordered superconductors. In: Physical Review B, 102 (2).

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Abstract

Recent experiments on disordered superconductors find that the superfluid density ns(T) decreases dramatically and characteristically with disorder, differently from what is expected for a mean order parameter field or BCS, amplitude only, picture for the superconductor. We describe here a new microscopic free energy functional which explicitly describes its dependence on both the amplitude and phase of superconducting order, in a gauge invariant manner. We use this here in an approximation of noninteracting phase fluctuations (Gaussian or harmonic approximation) to obtain ns(T) in the presence of (static) disorder. We compare our results successfully with experiment. © 2020 American Physical Society.

Item Type:	Journal Article
Publication:	Physical Review B
Publisher:	American Physical Society
Additional Information:	The copyright of this article beolongs to American Physical Society
Keywords:	Free energy, Disordered superconductors; Energy functionals; Gauge-invariant manner; Harmonic approximation; Order parameter; Phase fluctuation; Superconducting ordering; Superfluid density, Superconducting materials
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	25 Sep 2020 11:03
Last Modified:	25 Sep 2020 11:03
URI:	http://eprints.iisc.ac.in/id/eprint/66539

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