Impact of electron-electron interactions on the superfluid density of dirty superconductors

V. A. Khodel; J. W. Clark; M. V. Zverev

doi:10.1103/PhysRevB.99.184503

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Impact of electron-electron interactions on the superfluid density of dirty superconductors

V. A. Khodel, J. W. Clark, M. V. Zverev

DOI 10.1103/PhysRevB.99.184503 · Physical Review B

T1

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Abstract

Landau's theory of the Fermi liquid is adapted to analyze the impact of electron-electron (interactions on the deficit of the superfluid density ρs0=ρs(T=0) in dirty superconducting electron systems in which the damping γ of single-particle excitations exceeds the zero-temperature BCS gap Δ0. In the dirty strong-coupling limit γ/Δ0≫1,m*/me≫1, the formula derived for ρs0 is shown to coincide with the well-known empirical Uemura relation provided pair-breaking contributions are nonexistent. The roles of the crystal lattice and magnetic pair-breaking effects in the observed decline of the zero-temperature superfluid density ρs0 in overdoped La1−xSrxCuO4 compounds are also discussed, and our procedure is applied to elucidation of results from the pioneering experimental studies performed recently by Bozovic and collaborators in these compounds.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La1-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
SrTiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown