Strong-coupling calculation of the lower critical field in high-Tc superconductors

J. Rammer

doi:10.1103/PhysRevB.36.5665

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Strong-coupling calculation of the lower critical field in high-Tc superconductors

J. Rammer

DOI 10.1103/PhysRevB.36.5665 · Physical Review B

T1

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Abstract

Using the strong-coupling version of Usadel's dirty-limit theory, the lower critical field Hc1 of high-Tc superconductors is calculated. It is shown that the strong-coupling theory predicts a marked plateau in Hc1(T) at low temperatures, which is most pronounced for large electron-phonon coupling parameters λ. This effect can be used as a criterion for conventional electron-phonon superconductivity in high-Tc superconductors. The plateau has not been observed in early measurements of Hc1 in granular samples.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La1.85(BaSr)0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	35	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.	35	Pressure not reported	unknown
Ba2YCu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	91	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