Thermodynamic and other properties of a high-Tc excitonic superconductor

F. Marsiglio; J. P. Carbotte

doi:10.1103/PhysRevB.36.3937

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Thermodynamic and other properties of a high-Tc excitonic superconductor

F. Marsiglio, J. P. Carbotte

DOI 10.1103/PhysRevB.36.3937 · Physical Review B

T1

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Abstract

We have calculated the isotope effect, the thermodynamics, and the gap (Δ0) to critical temperature (Tc) ratio for an excitonic superconductor. We consider the possibility that some contribution to the pairing interaction is due to the electron-phonon interaction. As the amount of electron-phonon contribution is increased from zero, the thermodynamic ratios start deviating from Bardeen-Cooper-Schrieffer behavior, but in the opposite direction from conventional strong-coupling superconductors. The isotope effect increases very slowly from zero and 2Δ0kBTc remains close to 3.54 for a significant range of phonon coupling strength.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Ba2YCu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Ba2EuCu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	36	Pressure not reported	unknown
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	96	Pressure not reported	unknown