For {ital l}{gt}8 nd {ital J} not too small, phases with two-dimensional fluxon correlations occur near {ital T}{sub {ital c}}; this accounts for the observed {ital V}{similar to}{ital l}{sup {ital a}({ital T})} current-voltage relation in high-{ital T}{sub {ital c}} superconductors.

Paper

Vortex and fluxon phase transitions in layered superconductors.

Citations: 19

1991

Full text

Abstract

The system of superconducting layers with Josephson coupling {ital J} is studied. The ordering temperature {ital T}{sub {ital f}} for the fluxon loops parallel to the layers is shown to determine the transition temperature {ital T}{sub {ital c}} of the system, except when {ital J} is exponentially small; in the latter case {ital T}{sub {ital c}} drops towards the {ital J}=0 vortex transition, accounting for data on YBa{sub 2}Cu{sub 3}O{sub 7}/PrBa{sub 2}Cu{sub 3}O{sub 7} superlattices. A magnetic field parallel to the layers produces a sequence of phases in which the induced fluxon lines are {ital l} layers apart. For {ital l}{gt}8 nd {ital J} not too small, phases with two-dimensional fluxon correlations occur near {ital T}{sub {ital c}}; this accounts for the observed {ital V}{similar to}{ital l}{sup {ital a}({ital T})} current-voltage relation in high-{ital T}{sub {ital c}} superconductors.

Authors

Horovitz

Journal

Physical review letters

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