Gapless Fermi Surfaces in anisotropic multiband superconductors in magnetic field

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 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.

arXiv comment4 pages, 2 figures

References in corpus (12)

• Interior Gap Superfluidity
• Ginzburg-Landau theory of vortices in a multi-gap superconductor
• Texture in the Superconducting Order Parameter of CeCoIn_5 Revealed by Nuclear Magnetic Resonance
• Inhomogeneous LOFF phase revisited for surface superconductivity
• Breached pairing superfluidity: Possible realization in QCD
• Conventional mechanisms for "exotic" superconductivity
• Anisotropy of Thermal Conductivity and Possible Signature of the Fulde-Ferrell-Larkin-Ovchinnikov state in CeCoIn_5
• Phase Diagram and Spectroscopy of FFLO states of two-dimensional d-wave superconductors
• Observation of Spin Susceptibility Enhancement in the Possible FFLO State in CeCoIn${}_5$
• Topological Structure of a Vortex in Fulde-Ferrell-Larkin-Ovchinnikov State
• Breached Superfluidity via P-Wave Coupling
• Unusual magnetic field-induced phase transition in the mixed state of superconducting NbSe2

Cited by in corpus (10)

• Experimental evidence for a two-gap structure of superconducting NbSe_2: a specific heat study in external magnetic fields
• Primary role of the barely occupied states in the charge density wave formation of NbSe2
• Multiband Superconductivity in KFe2As2: Evidence for one Isotropic and several Liliputian Energy Gaps
• Evolution of the superconducting energy gap structure concomitant with Fermi surface reconstruction in the heavy-fermion superconductor CeCoIn5
• High-field phase-diagram of Fe arsenide superconductors
• Magnetic field-induced gapless state in multiband superconductors
• Field-induced gapless electron pocket in the superconducting vortex phase of YNi2B2C as probed by magnetoacoustic quantum oscillations
• Quantum critical quasiparticle scattering within the superconducting state of CeCoIn5
• Orbital and Pauli limiting effects in heavily doped Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Enhanced Fulde-Ferrell-Larkin-Ovchinnikov and Sarma superfluid states near an orbital Feshbach resonance