Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Unconventional Multiband Superconductivity in Bulk SrTiO3 and LaAlO3/SrTiO3 Interfaces

Full text
Author(s):
Trevisan, Thais V. [1, 2] ; Schutt, Michael [1] ; Fernandes, Rafael M. [1]
Total Authors: 3
Affiliation:
[1] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 - USA
[2] Univ Estadual Campinas, Inst Fis Gleb Wataghin, Rua Sergio Buarque de Holanda 777, BR-13083859 Campinas, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Physical Review Letters; v. 121, n. 12 SEP 18 2018.
Web of Science Citations: 12
Abstract

Although discovered many decades ago, superconductivity in doped SrTiO3 remains a topic of intense research. Recent experiments revealed that, upon increasing the carrier concentration, multiple bands cross the Fermi level, signaling the onset of Lifshitz transitions. Interestingly, T-c was observed to be suppressed across the Lifshitz transition of oxygen-deficient SrTiO3; a similar behavior was also observed in gated LaAlO3/SrTiO3 interfaces. Such a behavior is difficult to explain in the clean theory of two-band superconductivity, as the additional electronic states provided by the second band should enhance T-c. Here, we show that this unexpected behavior can be explained by the strong pair-breaking effect promoted by disorder, which takes place if the interband pairing interaction is subleading and repulsive. A consequence of this scenario is that, upon moving away from the Lifshitz transition, the two-band superconducting state changes from opposite-sign gaps to same-sign gaps. (AU)

FAPESP's process: 16/12874-3 - Pairing induced by the interplay between nematic and magnetic fluctuations in iron-based superconductors
Grantee:Thaís Victa Trevisan
Support Opportunities: Scholarships abroad - Research Internship - Doctorate