Observation of transient superconductivity at the LaAlO${}_3$/SrTiO${}_3$ interface

Abstract

We report the observation of a magnetic field assisted transient superconducting state in the two dimensional electron gas existing at the interface of LaAlO${}_3$/SrTiO${}_3$ heterostructures. This metastable state depends critically on the density of charge carriers in the system. It appears concomitantly with a Lifshitz transition as a consequence of the interplay between ferromagnetism and superconductivity and the finite relaxation time of the in-plane magnetization. Our results clearly demonstrate the inherently metastable nature of the superconducting state competing with a magnetic order in these systems. The co-existence of superconductivity and ferromagnetism in the conducting electronic layer formed at the interface of insulating oxides has thrown up several intriguing and as yet unanswered questions. An open question in this field is the energetics of the interplay between these two competing orders and the present observation goes a long way in understanding the underlying mechanism.

11 pages, 14 figures

References in corpus (13)

• Magnetic effects at the interface between nonmagnetic oxides
• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• A polarity-induced defect mechanism for conductivity and magnetism at polar-nonpolar oxide interfaces
• Nanoscale Phenomena in Oxide Heterostructures
• Polarity-induced oxygen vacancies at LaAlO3|SrTiO3 interfaces
• Large adiabatic temperature and magnetic entropy changes in EuTiO3
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• Surface magnetism of strontium titanate
• Evidence for charge-vortex duality at the LaAlO${}_3$/SrTiO${}_3$ interface
• Electron-phonon Coupling and the Superconducting Phase Diagram of the LaAlO3-SrTiO3 Interface
• Enhanced spin-orbit coupling and charge carrier density suppression in LaAl1-xCrxO3/SrTiO3 heterointerfaces
• Multi-band theory of superconductivity at the LaAlO${}_3$/SrTiO${}_3$ interface
• Dynamics of photo-generated non-equilibrium electronic states in Ar${}^{+}$ ion irradiated SrTiO${}_3$

Cited by in corpus (5)

• Modulation of the superconducting critical temperature due to quantum confinement at the LaAlO${}_3$/SrTiO${}_3$ interface
• Effect of multiband transport on charge carrier density fluctuations at the LaAlO${}_3$/SrTiO${}_3$ interface
• Long-lived non-equilibrium superconductivity in a non-centrosymmetric Rashba semiconductor
• Effect of spin-orbit interaction on the vortex dynamics in LaAlO${}_3$/SrTiO${}_3$ interfaces near the superconducting transition
• Novel Emergent Phases in a Two-Dimensional Superconductor