Coexistence of magnetic order and two-dimensional superconductivity at LaAlO3/SrTiO3 interfaces

2011/05/02 by Lu Li, Lü Li, Christoph Richter +3 · 857 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Condensed matter physics #Electronic and Structural Properties of Oxides #Magnetic and transport properties of perovskites and related materials #Magnetic field #Magnetic moment #Magnetization #Magnetometer #Physics #Quantum mechanics #Strontium titanate #Superconductivity #Thin film #cond-mat.mes-hall #cond-mat.mtrl-sci

paper · pdf · doi:10.1038/nphys2080

published in Nature Physics 7(10), 762-766 (Nature Portfolio) · 10 pages, 4 figures

arxiv created 2011/05/02 · openalex publication_date 2011/09/04 · arxiv updated 2015/05/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

A two dimensional electronic system with novel electronic properties forms at the interface between the insulators LaAlO₃ and SrTiO₃. 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.

Citations

• 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

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