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Multiband Effects in the Superconducting Phase Diagram of Oxide Interfaces

Jouan, A., Hurand, S., Singh, G., Lesne, E., Barthélémy, A., Bibes, M., et al. (2022). Multiband Effects in the Superconducting Phase Diagram of Oxide Interfaces. Advanced Materials Interfaces, 2201392, pp. 1-8. doi:10.1002/admi.202201392.

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Genre: Journal Article

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Creators:
Jouan, Alexis1, Author
Hurand, Simon1, Author
Singh, Gyanendra1, Author
Lesne, Edouard2, Author
Barthélémy, Agnés1, Author
Bibes, Manuel1, Author
Ulysse, Christian1, Author
Saiz, Guilhem1, Author
Feuillet-Palma, Chéryl1, Author
Lesueur, Jérôme1, Author
Bergeal, Nicolas1, Author
Affiliations:
1External Organizations, ou_persistent22
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425

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Abstract: A dome-shaped phase diagram of superconducting critical temperature upon doping is often considered as a hallmark of unconventional superconductors. This behavior, observed in SrTiO3-based interfaces, whose electronic density is controlled by field-effect, has not been explained unambiguously yet. Here, a generic scenario for the superconducting phase diagram of these oxide interfaces is elaborated based on transport experiments on a double-gate LaAlO3/SrTiO3 field-effect device and Schrodinger-Poisson numerical simulations of the quantum well. The optimal doping point of maximum T-c is ascribed to the transition between a single-gap and a fragile two-gap s(+/-)-wave superconducting state involving bands of different orbital character. Close to this point, a bifurcation in the dependence of T-c on the carrier density, which can be controlled by the details of the doping execution, is observed experimentally and reproduced by numerical simulations. Where doping with a back-gate triggers the filling of a new dxy${d_{{\rm{xy}}}}$ subband and initiates the overdoped regime, doping with a top-gate delays the filling of the subband and maintains the 2D electron gaz in the single-gap state of higher T-c. Such a bifurcation, whose branches can be followed reversibly, provides a generic explanation for the dome-shaped superconducting phase diagram that could be extended to other multiband superconducting materials.

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Language(s): eng - English
Dates: 2022-09-072022-09-07
Publication Status: Published in print
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