Effect of disorder on superconductivity and Rashba spin-orbit coupling in LaAlO3/SrTiO3 interfaces

Abstract

A rather unique feature of the two-dimensional electron gas (2-DEG) formed at the interface between the two insulators LaAlO3 and SrTiO3 is to host both gate-tunable superconductivity and strong spin-orbit coupling. In the present work, we use the disorder generated by Cr substitution of Al atoms in LaAlO3 as a tool to explore the nature of superconductivity and spin-orbit coupling in these interfaces. A reduction of the superconducting Tc is observed with Cr doping consistent with an increase of electron-electron interaction in presence of disorder. In addition, the evolution of spin-orbit coupling with gate voltage and Cr doping suggests a D'Yakonov-Perel mechanism of spin relaxation in the presence of a Rashba-type spin-orbit interaction.

References in corpus (14)

• Why Some Interfaces Cannot be Sharp
• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• Tunable Rashba spin-orbit interaction at oxide interfaces
• Direct imaging of the coexistence of ferromagnetism and superconductivity at the LaAlO3/SrTiO3 interface
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• Nonlinear Hall effect and multichannel conduction in LaTiO3/SrTiO3 superlattices
• Anisotropic magneto-transport effects at SrTiO3\LaAlO3 interfaces
• Dynamical response and confinement of the electrons at the LaAlO3/SrTiO3 interface
• Phase separation from electron confinement at oxide interfaces
• Multi-band superconductivity and nanoscale inhomogeneity at oxide interfaces
• Enhanced spin-orbit interaction and Kondo scattering in $\delta$-doped LaTiO${}_3$/SrTiO${}_3$ interfaces
• Enhanced spin-orbit coupling and charge carrier density suppression in LaAl1-xCrxO3/SrTiO3 heterointerfaces

Cited by in corpus (8)

• Physics of SrTiO${}_3$-based heterostructures and nanostructures: a review
• Superfluid stiffness of a KTaO3-based two-dimensional electron gas
• Competition between electron pairing and phase coherence in superconducting interfaces
• From low-field Sondheimer oscillations to high-field very large and linear magnetoresistance in a SrTiO${}_3$-based two-dimensional electron gas
• 2D versus 3D-like electrical behavior of MXene thin films: insights from weak localization in the role of thickness, interflake coupling and defects
• Quantized conductance in a one-dimensional ballistic oxide nanodevice
• Single-band to two-band superconductivity transition in two-dimensional oxide interfaces
• Origin of the dome-shaped superconducting phase diagram in ${\mathrm{SrTiO}}_3$-based interfaces