Two-gap s± -wave superconductivity at an oxide interface
Artikel i vetenskaplig tidskrift, 2022

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 Hc2 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.

Författare

Gyanendra Singh

Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)

Université de recherche Paris Sciences et Lettres

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

G. Venditti

Sapienza, Università di Roma

Istituto Dei Sistemi Complessi, Rome

G. Saiz

Université de recherche Paris Sciences et Lettres

G. Herranz

Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)

F. Sánchez

Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)

A. Jouan

Université de recherche Paris Sciences et Lettres

C. Feuillet-Palma

Université de recherche Paris Sciences et Lettres

J. Lesueur

Université de recherche Paris Sciences et Lettres

M. Grilli

Sapienza, Università di Roma

Istituto Dei Sistemi Complessi, Rome

S. Caprara

Istituto Dei Sistemi Complessi, Rome

Sapienza, Università di Roma

N. Bergeal

Université de recherche Paris Sciences et Lettres

Physical Review B

24699950 (ISSN) 24699969 (eISSN)

Vol. 105 6 064512

Ämneskategorier

Annan fysik

Teoretisk kemi

Den kondenserade materiens fysik

DOI

10.1103/PhysRevB.105.064512

Mer information

Senast uppdaterat

2022-03-21