Critical doping for the onset of a two-band superconducting ground state in SrTiO${}_{3-\delta }$

Abstract

In doped SrTiO${}_3$ 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 $10^{20}$ $c{m}^{-3}$ 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.

5 pages of main article and 4 pages of supplement

References in corpus (5)

• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• Electron-phonon interaction and charge carrier mass enhancement in SrTiO3
• Fermi surface of the most dilute superconductor
• BCS theory of superconductivity: the world's largest Madoff scheme?
• Structure and Correlation Effects in Semiconducting SrTiO${}_3$

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