Pairing Fluctuation Theory of Superconducting Properties in Underdoped to Overdoped Cuprates

Qijin Chen; Ioan Kosztin; Boldizsár Jankó; K. Levin

doi:10.1103/PhysRevLett.81.4708

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Pairing Fluctuation Theory of Superconducting Properties in Underdoped to Overdoped Cuprates

Qijin Chen, Ioan Kosztin, Boldizsár Jankó, K. Levin

DOI 10.1103/PhysRevLett.81.4708 · Physical Review Letters

T1

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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 Tc and the zero temperature excitation gap Δ(0), as a function of hole concentration x, are in semiquantitative agreement with experiment. Although Tc/Δ(0) has a strong non-BCS x dependence, and Δ(T) deviates significantly from the BCS prediction, we obtain, remarkably, quasiuniversal behavior for the superfluid density ρs(T)/ρs(0) and the Josephson critical current Ic(T)/Ic(0) as a function of T/Tc. Comparison with experiment is addressed.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown