Vortex and critical fields in charged Bose liquids and unconventional superconductors

Details Vortex and critical fields in charged Bose liquids and unconventional superconductors Vortex and critical fields in charged Bose liquids and unconventional superconductors

2003-08-25

arxiv.org/abs/cond-mat/0308491v1

Physica C, v.404, 22 (2004)

Physics

Condensed Matter

Superconductivity

12 pages, 3 figures, invited paper at the International Conference 'Vortex III', Crete (September 2003)

Scientific paper

10.1016/j.physc.2003.10.038

A single vortex in the charged Bose gas (CBG) has a charged core and its profile different from the vortex in neutral and BCS superfluids. Lower and upper critical fields of CBG are discussed. The unusual resistive upper critical field, Hc2(T), of many cuprates and a few other unconventional superconductors is described as the Bose-Einstein condensation field of preformed bosons-bipolarons. Its nonlinear temperature dependence follows from the scaling arguments. Exceeding the Pauli paramagnetic limit is explained. Controversy in the determination of Hc2(T) of cuprates from kinetic and thermodynamic measurements is addressed in the framework of the bipolaron theory.

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