Microscopic model for high-Tc oxide superconductors

Jian Ping Lu; K. Arya; Joseph L. Birman

doi:10.1103/PhysRevB.40.7372

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Microscopic model for high-Tc oxide superconductors

Jian Ping Lu, K. Arya, Joseph L. Birman

DOI 10.1103/PhysRevB.40.7372 · Physical Review B

T1

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Abstract

We report results of a BCS-pairing theory of high-Tc superconductors based on a model using interlayer charge-transfer excitation as the intermediate boson. We apply the model specifically to YBa2Cu3O7. The relevant electronic band structure is calculated analytically using the tight-binding approximation, which is in agreement with numerical results. A specific interlayer charge-transfer excitation is identified. The Eliashberg equations are solved in the Kirzhnits-Maksimov-Khomskii approximation to obtain Tc and the gap Δ. We find 2Δ/KTc∼10–14, and Tc increasing exponentially with a decrease in the Cu(2)-O(4) bond length. These results are in general agreement with some recent experiments.

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.	—	Pressure not reported	unknown