Back to Search
Start Over
BCS-BEC crossover induced by a shallow band: Pushing standard superconductivity types apart
BCS-BEC crossover induced by a shallow band: Pushing standard superconductivity types apart
- Source :
- Physical Review B. 95
- Publication Year :
- 2017
- Publisher :
- American Physical Society (APS), 2017.
-
Abstract
- 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 ${\mathrm{Fe}\mathrm{Se}}_{x}{\mathrm{Te}}_{1\ensuremath{-}x}$ and $\mathrm{FeSe}$.
- Subjects :
- Condensed Matter::Quantum Gases
Superconductivity
Physics
Condensed matter physics
Condensed Matter::Other
Crossover
02 engineering and technology
Radius
021001 nanoscience & nanotechnology
01 natural sciences
Square (algebra)
Condensed Matter::Superconductivity
0103 physical sciences
Domain (ring theory)
010306 general physics
0210 nano-technology
Phase diagram
Subjects
Details
- ISSN :
- 24699969 and 24699950
- Volume :
- 95
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi.dedup.....a224f011123b5196ae9b170a32a5c36f
- Full Text :
- https://doi.org/10.1103/physrevb.95.094521