Re-entrant superconductivity at an oxide heterointerface
Abstract
A magnetic field typically suppresses superconductivity by either breaking Cooper pairs via the Zeeman effect or inducing vortex formation. However, under certain circumstances, a magnetic field can stabilize superconductivity instead. This seemingly counterintuitive phenomenon is associated with magnetic interactions and has been extensively studied in three-dimensional materials. By contrast, this phenomenon, hinting at unconventional superconductivity, remains largely unexplored in two-dimensional systems, with moir\'e-patterned graphene being the only known example. Here, we report the observation of re-entrant superconductivity (RSC) at the epitaxial (110)-oriented LaTiO3-KTaO3 interface. This phenomenon occurs across a wide range of charge carrier densities, which, unlike in three-dimensional materials, can be tuned in-situ via electrostatic gating. We attribute the re-entrant superconductivity to the interplay between a strong spin-orbit coupling and a magnetic-field driven modification of the Fermi surface. Our findings offer new insights into re-entrant superconductivity and establish a robust platform for exploring novel effects in two-dimensional superconductors.
Cite
@article{arxiv.2510.01682,
title = {Re-entrant superconductivity at an oxide heterointerface},
author = {D. Maryenko and M. Kawamura and I. V. Maznichenko and S. Ostanin and D. Zhang and M. Kriener and V. K. Dugaev and E. Ya. Sherman and A. Ernst and M. Kawasaki},
journal= {arXiv preprint arXiv:2510.01682},
year = {2025}
}