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Two-gap s±-wave superconductivity at an oxide interface
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DOI：10.1103/PhysRevB.105.064512.png)
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After half a century of debate, superconductivity in doped SrTiO3 has come to the fore again with the discovery of interfacial superconductivity in the LaAlO3/SrTiO3 heterostructures. While these interfaces share the interesting properties of bulk SrTiO3, quantum confinement generates a complex band structure involving bands with different orbital symmetries whose occupancy is tunable by electrostating doping. Multigap superconductivity has been predicted to emerge in LaAlO3/SrTiO3 at large doping, with a Bose-Einstein condensation character at the Lifshtiz transition. In this article, we report on the measurement of the upper critical magnetic field H-c2 of superconducting (110)-oriented LaAlO3/SrTiO3 heterostructures and evidence a two-gap superconducting regime at high doping. Our results are quantitatively explained by a theoretical model based on the formation of an unconventional s(+/-)-wave superconducting state with a repulsive coupling between the two condensates.
Keyword:
2-BAND SUPERCONDUCTIVITY
MECHANISM
BEHAVIOR
期刊
IF:
3.7
论文数:
15.4W
被引数:
41.0W
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Strong correlations elucidate the electronic structure and phase diagram of LaAlO3/SrTiO3 interface.png)
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