Gapless Fermi Surfaces in anisotropic multiband superconductors in magnetic field

Details Gapless Fermi Surfaces in anisotropic multiband superconductors in magnetic field Gapless Fermi Surfaces in anisotropic multiband superconductors in magnetic field

2006-10-11

arxiv.org/abs/cond-mat/0610315v3

Phys. Rev. Lett. 98, 087004 (2007)

Physics

Condensed Matter

Superconductivity

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.98.087004

We propose that a new state with a fully gapless Fermi surface appears in quasi-2D multiband superconductors in magnetic field applied parallel to the plane. It is characterized by a paramagnetic moment caused by a finite density of states on the open Fermi surface. We calculate thermodynamic and magnetic properties of the gapless state for both s-wave and d-wave cases, and discuss the details of the 1-st order metamagnetic phase transition that accompanies the appearance of the new phase in s-wave superconductors. We suggest possible experiments to detect this state both in the s-wave (2-H NbSe2) and d-wave (CeCoIn5) superconductors.

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