Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 94: Low-Dimensional Systems: Oxide Hetero-Interfaces
TT 94.4: Vortrag
Donnerstag, 3. April 2014, 15:45–16:00, HSZ 204
Emerging magnetism and electronic phase separation at titanate interfaces — •Natalia Pavlenko1, Thilo Kopp1, and Jochen Mannhart2 — 1EKM und Institut für Physik, Universität Augsburg, 86135 Augsburg, Germany — 2Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany
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.