Agradecimentos: We thank A. Balatsky, K. Behnia, A. Chubukov, M. Gastiasoro, B. Jalan, C. Leighton, G. Lonzarich, and V. Pribiag for fruitful discussions. This work was supported by the U. S. Department of Energy through the University of Minnesota Center for Quantum Materials, under Award No....

Agradecimentos: We thank A. Balatsky, K. Behnia, A. Chubukov, M. Gastiasoro, B. Jalan, C. Leighton, G. Lonzarich, and V. Pribiag for fruitful discussions. This work was supported by the U. S. Department of Energy through the University of Minnesota Center for Quantum Materials, under Award No. DE-SC-0016371 (R. M. F.). T. V. T. acknowledges the support from the Sao Paulo Research Foundation (Fapesp, Brazil) via the BEPE scholarship No. 2016/12874-3

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...

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

FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP

2016/12874-3

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