A new broken U(1)-symmetry in extreme type-II superconductors

Details A new broken U(1)-symmetry in extreme type-II superconductors A new broken U(1)-symmetry in extreme type-II superconductors

1998-11-11

arxiv.org/abs/cond-mat/9811149v2

EuroPhys. Lett. 46, 780 (1999)

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures

Scientific paper

10.1209/epl/i1999-00332-7

A phase transition within the molten phase of the Abrikosov vortex system without disorder in extreme type-II superconductors is found via large-scale Monte-Carlo simulations. It involves breaking a U(1)-symmetry, and has a zero-field counterpart, unlike vortex lattice melting. Its hallmark is the loss of number-conservation of connected vortex paths threading the entire system {\it in any direction}, driving the vortex line tension to zero. This tension plays the role of a generalized ``stiffness'' of the vortex liquid, and serves as a probe of the loss of order at the transition, where a weak specific heat anomaly is found.

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