Interplay between density and superconducting quantum critical fluctuations. (29th September 2015)

• Record Type: Journal Article
• Authors: Caprara, S; Bergeal, N; Lesueur, J; Grilli, M
• Is Part Of: Journal of physics. Volume 27:Number 42(2015)
• Publication Date: 2015-09-29
• Subjects: inhomogeneous superconductors -- quantum critical phenomena -- coupled density and superconducting fluctuations; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/0953-8984/27/42/425701
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: We consider the case of a density-driven metal-superconductor transition in the proximity of an electronic phase separation. In particular, we investigate the interplay between superconducting fluctuations and density fluctuations, which become quantum critical when the electronic phase separation vanishes at zero temperature into a quantum critical point. In this situation, the critical dynamical density fluctuations strongly affect the dynamics of the Cooper-pair fluctuations, which acquire a more singular character with a z = 3 dynamical critical index. This gives rise to a scenario that possibly rules the disappearance of superconductivity when the electron density is reduced by electrostatic gating at the LaAlO3 /SrTiO3 interface.