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BCS-BEC crossover induced by a shallow band : Pushing standard superconductivity types apart

Title data

Wolf, Sebastian ; Vagov, Alexei ; Shanenko, A. A. ; Axt, Vollrath M. ; Perali, A. ; Aguiar, J. Albino:
BCS-BEC crossover induced by a shallow band : Pushing standard superconductivity types apart.
In: Physical Review B. Vol. 95 (2017) Issue 9 . - Art.Nr. 094521.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.95.094521

Project information

Project financing: Supported by the Brazilian agencies CNPq (Grants No. 307552/2012-8 and No. 141911/2012-3) and FACEPE (APQ-0936-1.05/15).

Abstract in another language

The appearance of a shallow band(s) drives a superconductor towards the BCS-BEC crossover, conventionally associated with notable changes in single-particle properties and an elevated critical temperature. Here we demonstrate that the proximity to the crossover induced by a shallow band has also a dramatic effect on the phase diagram of the superconducting magnetic properties. When the system passes from the BCS to BEC regime, the intertype domain between superconductivity types I and II enlarges systematically, being inversely proportional to the square of the Cooper-pair radius, the main parameter that controls the BCS-BEC superconductivity. We also show that despite the presence of a shallow band, the condensate fluctuations are suppressed when it coexists in one material with standard deep bands, as in recent iron chalcogenides FeSexTe1−x and FeSe.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: superconductivity; multiband superconductor; BCS; BEC; extended Landau Ginzburg theory; intertype superconductivity; exotic superconductors; shallow band; BCS-BEC crossover; condensate flustuations
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III > Chair Theoretical Physics III - Univ.-Prof. Dr. Martin Axt
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 06 Nov 2017 12:48
Last Modified: 06 Nov 2017 12:48
URI: https://eref.uni-bayreuth.de/id/eprint/40301