期刊
PHYSICAL REVIEW LETTERS
卷 112, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.112.207002
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资金
- Agence Nationale de la Recherche as part of QUANTHERM priject
- Agence Nationale de la Recherche as part of SUPERFIELD project
- EuroMagNET II under EU [228043]
In doped SrTiO3 superconductivity persists down to an exceptionally low concentration of mobile electrons. This restricts the relevant energy window and possible pairing scenarios. We present a study of quantum oscillations and superconducting transition temperature T-c as the carrier density is tuned from 10(17) to 10(20) cm(-3) and identify two critical doping levels corresponding to the filling thresholds of the upper bands. At the first critical doping, which separates the single-band and the two-band superconducting regimes in oxygen-deficient samples, the steady increase of T-c with carrier concentration suddenly stops. Near this doping level, the energy dispersion in the lowest band displays a downward deviation from parabolic behavior. The results impose new constraints for microscopic pairing scenarios.
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