Coexistence of Magnetic Order and Two-dimensional Superconductivity at LaAlO${}_3$/SrTiO${}_3$ Interfaces

Abstract

A two dimensional electronic system with novel electronic properties forms at the interface between the insulators LaAlO${}_3$ and SrTiO${}_3$. Samples fabricated until now have been found to be either magnetic or superconducting, depending on growth conditions. We combine transport measurements with high-resolution magnetic torque magnetometry and report here evidence of magnetic ordering of the two-dimensional electron liquid at the interface. The magnetic ordering exists from well below the superconducting transition to up to 200 K, and is characterized by an in-plane magnetic moment. Our results suggest that there is either phase separation or coexistence between magnetic and superconducting states. The coexistence scenario would point to an unconventional superconducting phase in the ground state.

10 pages, 4 figures

References in corpus (7)

• Magnetic effects at the interface between nonmagnetic oxides
• Direct imaging of the coexistence of ferromagnetism and superconductivity at the LaAlO3/SrTiO3 interface
• Coexistence of superconductivity and ferromagnetism in two dimensions
• A multi-component Fermi surface in the vortex state of an underdoped high-Tc superconductor
• Electronic structure induced reconstruction and magnetic ordering at the LaAlO${}_3|$SrTiO${}_3$ interface
• Structure-Property Relation of SrTiO3-LaAlO3 Interfaces
• Anomalous magneto-transport at the superconducting interface between LaAlO3 and SrTiO3

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