Energy gap, Tc, and density of states in high-temperature superconductors for retarded s- and d-wave interactions

C. T. Rieck; D. Fay; L. Tewordt

doi:10.1103/PhysRevB.41.7289

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Energy gap, Tc, and density of states in high-temperature superconductors for retarded s- and d-wave interactions

C. T. Rieck, D. Fay, L. Tewordt

DOI 10.1103/PhysRevB.41.7289 · Physical Review B

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Abstract

We employ strong-coupling theory to investigate the effect of the form of the spectral function α2F for isotropic and anisotropic interactions on the tunneling density of states N(ω), Tc, and the ratio 2Δ/kBTc. Resistivity data are used to fix the isotropic coupling constant λ0∼1. This severely restricts the results for s-wave pairing; high-energy spectral weight is required in addition to phonons. The anisotropic interaction is not restricted by the resistivity and thus with d-wave pairing a variety of data, including the linear behavior of N(ω) within the gap, can be fitted without high-energy interactions.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	89.6	Pressure not reported	unknown