Pressure induced FFLO instability in multi-band superconductors

Abstract

Multi-band systems as intermetallic and heavy fermion compounds have quasi-particles arising from different orbitals at their Fermi surface. Since these quasi-particles have different masses or densities, there is a natural mismatch of the Fermi wave-vectors associated with different orbitals. This makes these materials potential candidates to observe exotic superconducting phases as Sarma or FFLO phases, even in the absence of an external magnetic field. The distinct orbitals coexisting at the Fermi surface are generally hybridized and their degree of mixing can be controlled by external pressure. In this Communication we investigate the existence of an FFLO phase in a two-band BCS superconductor controlled by hybridization. At zero temperature, as hybridization (pressure) increases we find that the BCS state becomes unstable with respect to an inhomogeneous superconducting state characterized by a single wave-vector q.

5 pages, 1 figure

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• Avoided Antiferromagnetic Order and Quantum Critical Point in CeCoIn${}_5$
• Phase separation in asymmetrical fermion superfluids
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Cited by in corpus (10)

• Phase transitions in superconductor liquid crystals
• Mechanism for enhancement of superconductivity in multi-band systems with odd parity hybridization
• Dimensional Crossover in a Spin-imbalanced Fermi gas
• Quantum normal-to-inhomogeneous superconductor phase transition in nearly two-dimensional metals
• Multiband superconductivity in $\mathrm{Bi}{\mathrm{S}}_2$-based layered compounds
• Quantum criticality in inter-band superconductors
• Superconductivity near Pomeranchuk instabilities in the spin channel
• Fluctuations in a superconducting quantum critical point of multi-band metals
• One-dimensional physics in transition-metal nanowires: Phases and elementary excitations
• The connection between Superconductors of Type I and II due polarons and Itinerant Antiferromagnetism in weak's coupling regime