Emerging magnetism and electronic phase separation at titanate interfaces

Abstract

The emergence of magnetism in otherwise nonmagnetic compounds and its underlying mechanisms have become the subject of intense research. Here we demonstrate that the nonmagnetic oxygen vacancies are responsible for an unconventional magnetic state common for titanate interfaces and surfaces. Using an effective multiorbital modelling, we find that the presence of localized vacancies leads to an interplay of ferromagnetic order in the itinerant t2g band and complex magnetic oscillations in the orbitally-reconstructed eg-band, which can be tuned by gate fields at oxide interfaces. The magnetic phase diagram includes highly fragmented regions of stable and phase-separated magnetic states forming beyond nonzero critical defect concentrations.

5 pages, 4 figures

References in corpus (11)

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Cited by in corpus (16)

• Phase separation from electron confinement at oxide interfaces
• Competition Between Kondo Screening and Magnetism at the LaAlO${}_3$/SrTiO${}_3$ Interface
• Controlling Kondo-like Scattering at the SrTiO3-based Interfaces
• Electron correlation and magnetism at the LaAlO${}_3$/SrTiO${}_3$ interface: A DFT+DMFT investigation
• Electronic phase separation at LaAlO3/SrTiO3 interfaces tunable by oxygen deficiency
• Oxygen Vacancies on SrO-terminated SrTiO3(001) Surfaces studied by Scanning Tunneling Spectroscopy
• Interface exchange processes in LaAlO${}_3$/SrTiO${}_3$ induced by oxygen vacancies
• Oxygen vacancies and hydrogen doping in LaAlO3/SrTiO3 heterostructures: electronic properties and impact on surface and interface reconstruction
• Gate-tunability of the superconducting state at the $EuO/KTa{O}_3(111)$ interface
• Capacitance and compressibility of heterostructures with strong electronic correlations
• Oxygen-vacancy clustering and pseudogap behaviour at LaAlO3/SrTiO3 interface
• Anomalous transport near the Lifshitz transition at the LaAlO${}_3$/SrTiO${}_3$ interface
• Analysis of electronic and structural properties of surfaces and interfaces based on LaAlO3 and SrTiO3
• Structure and ferromagnetic instability of the oxygen-deficient SrTiO${}_3$ surface
• Spin-orbit controlled quantum capacitance of a polar heterostructure
• Spectral properties of heterostructures containing half-metallic ferromagnets in the presence of local many-body correlations