2013/08/24 by N. Pavlenko, Н. В. Павленко, T. Kopp +2
Materials Science · Physics and Astronomy · #Condensed matter physics #Electronic and Structural Properties of Oxides #Ferroelectric and Piezoelectric Materials #Ferromagnetism #Magnetic and transport properties of perovskites and related materials #Magnetism #Materials science #Phase (matter) #Phase diagram #Physics #Quantum mechanics #cond-mat.mes-hall #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.88.201104
published as Phys. Rev. B 88, 201104(R) (2013) · 5 pages, 4 figures
arxiv created 2013/08/24 · openalex publication_date 2013/11/14 · arxiv updated 2013/11/15 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 modeling, 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.