Phase transitions in layered superconductors

Baruch Horovitz

doi:10.1103/PhysRevB.45.12632

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Phase transitions in layered superconductors

Baruch Horovitz

DOI 10.1103/PhysRevB.45.12632 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

A system of superconducting layers with Josephson coupling J between them is studied. When the in-layer penetration depth λe is larger than the spacing d between layers, as in CuO2-based superconductors, there is a single three-dimensional transition temperature Tc. The ratio Tc/τ, where τ=φ02/4π2λe, is found to vary from ∼1/8 to ∼1, being near 1/8 when J/Tc is exponentially small. When λe≲d a two-dimensional (2D) behavior is possible; in particular, bulk superconductors separated by 2D junctions exhibit a 2D transition, below the bulk transition, in which the junctions become ordered. This 2D behavior is due to the gauge coupling and is absent in an XY model where λe→∞.

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.	90	Pressure not reported	unknown
PrBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	20	Pressure not reported	unknown
Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	59	Pressure not reported	unknown
Bi2Sr2CuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	unknown