Nature of Decoupling in the Mixed Phase of Extremely Type-II Layered Superconductors
J.P. Rodriguez
TL;DR
This paper analyzes the layered XY model to identify a decoupled vortex liquid phase and its transition lines, explaining flux-lattice melting and depinning in high-temperature superconductors.
Contribution
It introduces a detailed analysis of the decoupling phenomena in the mixed phase of layered superconductors using the Villain form of the XY model.
Findings
Identification of a decoupled pancake vortex liquid phase
Boundaries of first-order and second-order decoupling lines
Explanation of flux-lattice melting and depinning phenomena
Abstract
The uniformly frustrated layered XY model is analyzed in its Villain form. A decouple pancake vortex liquid phase is identified. It is bounded by both first-order and second-order decoupling lines in the magnetic field versus temperature plane. These transitions, respectively, can account for the flux-lattice melting and for the flux-lattice depinning observed in the mixed phase of clean high-temperature superconductors.
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