Lower critical field of a Josephson-coupled layer model of high-Tc superconductors

John R. Clem; Mark W. Coffey; Zhidong Hao

doi:10.1103/PhysRevB.44.2732

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Lower critical field of a Josephson-coupled layer model of high-Tc superconductors

John R. Clem, Mark W. Coffey, Zhidong Hao

DOI 10.1103/PhysRevB.44.2732 · Physical Review B

T1

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Abstract

We calculate the lower critical field Hc1 for a magnetic field applied parallel to the layers of a Josephson-coupled layer model of high-Tc superconductors. This result is obtained by using an expression for the vortex line energy that explicitly involves the gauge-invariant phase difference between superconducting layers. We examine the behavior of Hc1 as a function of temperature and discuss the manifestation of the superconductor discreteness below a crossover temperature where the coherence length ξc(T) becomes comparable to the lattice constant c. This temperature dependence is contrasted with the standard result for Hc1 for a continuous anisotropic type-II superconductor.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
(BEDT-TTF)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown