Gapless Fermi Surfaces of Anisotropic Multiband Superconductors in a Magnetic Field

Victor Barzykin; L. P. Gor’kov

doi:10.1103/PhysRevLett.98.087004

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Gapless Fermi Surfaces of Anisotropic Multiband Superconductors in a Magnetic Field

Victor Barzykin, L. P. Gor’kov

DOI 10.1103/PhysRevLett.98.087004 · Physical Review Letters

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Abstract

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 first 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
NbSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown