Pairing Fluctuation Theory of Superconducting Properties in Underdoped to Overdoped Cuprates

1998/07/31 by Qijin Chen, Ioan Kosztin, Boldizsar Janko +2 · 7 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.81.4708

published as Phys. Rev. Lett. 81, 4708 (1998) · 4 pages, 3 figures, REVTeX, submitted to Phys. Rev. Lett

arxiv created 1998/07/31 · openalex publication_date 1998/11/23 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We propose a theoretical description of the superconducting state of under- to overdoped cuprates, based on the short coherence length of these materials and the associated strong pairing fluctuations. The calculated T_c and the zero temperature excitation gap \ensuremathΔ(0), as a function of hole concentration x, are in semiquantitative agreement with experiment. Although T_c/\ensuremathΔ(0) has a strong non-BCS x dependence, and \ensuremathΔ(T) deviates significantly from the BCS prediction, we obtain, remarkably, quasiuniversal behavior for the superfluid density \ensuremathρ_s(T)/\ensuremathρ_s(0) and the Josephson critical current I_c(T)/I_c(0) as a function of T/T_c. Comparison with experiment is addressed.

Citations

• Relationship between the pseudo- and superconducting gaps: Effects of residual pairing correlations belowTc

Cited by

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• Magnetic-field effects in the pseudogap phase: A competing energy gap scenario for precursor superconductivity
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