Anisotropic electron coupling as a phenomenological model for high-Tc superconductors

K. Langfeld; E. Frey

doi:10.1103/PhysRevB.48.4176

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Anisotropic electron coupling as a phenomenological model for high-Tc superconductors

K. Langfeld, E. Frey

DOI 10.1103/PhysRevB.48.4176 · Physical Review B

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Abstract

A three-dimensional weak coupling BCS model with an anisotropic pairing interaction in momentum space is reported. It exhibits an anisotropic gap in accord with recent experimental observations for high-Tc oxides. The gap ratio 2Δ/kBTc is calculated as a function of the anisotropy ratio of the electron pairing. It is found that the mean gap ratio decreases with increasing anisotropy of the electron pairing, whereas the maximum gap ratio increases. Assuming a unique strength of the effective electron interaction the transition temperature turns out to be always larger than in the isotropic case. The temperature dependence of the gap in the Cu-O plane and along the c axis of Y-Ba-Cu-O is presented.

Source-reported materials — not catalogue approval

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