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Critical magnetic fields in a superconductor coupled to a superfluid

Critical magnetic fields in a superconductor coupled to a superfluid
Critical magnetic fields in a superconductor coupled to a superfluid
We study a superconductor that is coupled to a superfluid via density and derivative couplings. Starting from a Lagrangian for two complex scalar fields, we derive a temperature-dependent Ginzburg-Landau potential, which is then used to compute the phase diagram at nonzero temperature and external magnetic field. This includes the calculation of the critical magnetic fields for the transition to an array of magnetic flux tubes, based on an approximation for the interaction between the flux tubes. We find that the transition region between type-I and type-II superconductivity changes qualitatively due to the presence of the superfluid: the phase transitions at the upper and lower critical fields in the type-II regime become first order, opening the possibility of clustered flux tube phases. These flux tube clusters may be realized in the core of neutron stars, where superconducting protons are expected to be coupled to superfluid neutrons.
1550-7998
Haber, Alexander
e3efa42e-1632-49b5-9fb3-813d8a4c9af3
Schmitt, Andreas
1765159f-255f-45e7-94ea-58c1c883d65f
Haber, Alexander
e3efa42e-1632-49b5-9fb3-813d8a4c9af3
Schmitt, Andreas
1765159f-255f-45e7-94ea-58c1c883d65f

Haber, Alexander and Schmitt, Andreas (2017) Critical magnetic fields in a superconductor coupled to a superfluid. Physical Review D, 95 (11), [116016]. (doi:10.1103/PhysRevD.95.116016).

Record type: Article

Abstract

We study a superconductor that is coupled to a superfluid via density and derivative couplings. Starting from a Lagrangian for two complex scalar fields, we derive a temperature-dependent Ginzburg-Landau potential, which is then used to compute the phase diagram at nonzero temperature and external magnetic field. This includes the calculation of the critical magnetic fields for the transition to an array of magnetic flux tubes, based on an approximation for the interaction between the flux tubes. We find that the transition region between type-I and type-II superconductivity changes qualitatively due to the presence of the superfluid: the phase transitions at the upper and lower critical fields in the type-II regime become first order, opening the possibility of clustered flux tube phases. These flux tube clusters may be realized in the core of neutron stars, where superconducting protons are expected to be coupled to superfluid neutrons.

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PhysRevD.95.116016 - Version of Record
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Accepted/In Press date: 5 June 2017
e-pub ahead of print date: 30 June 2017

Identifiers

Local EPrints ID: 412908
URI: http://eprints.soton.ac.uk/id/eprint/412908
ISSN: 1550-7998
PURE UUID: f18d689e-2253-4cbb-a9cd-4f26ae8288e4
ORCID for Andreas Schmitt: ORCID iD orcid.org/0000-0003-2858-4450

Catalogue record

Date deposited: 08 Aug 2017 16:31
Last modified: 17 Dec 2019 01:33

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