Abstract
Anisotropic magnetoresistance and negative magnetoresistance for in-plane fields are compared for the LaAlO3/SrTiO3 interface and the symmetric Nb-doped SrTiO3 heterostructure. Both effects are exceptionally strong in LaAlO3/SrTiO3. We analyze their temperature, magnetic field, and gate voltage dependencies and find them to arise from a Rashba-type spin-orbit coupling with magnetic scatterers that have two contributions to their potential: spin exchange and Coulomb interaction. Atomic spin-orbit coupling is sufficient to explain the small effects observed in Nb-doped SrTiO3. These results clarify contradicting transport interpretations in SrTiO3 based heterostructures.
Original language | English |
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Article number | 121104 |
Number of pages | 5 |
Journal | Physical Review B: Condensed Matter and Materials Physics |
Volume | 86 |
Issue number | 12 |
DOIs | |
Publication status | Published - 11 Sept 2012 |
Keywords
- LAALO3/SRTIO3 INTERFACE
- ELECTRON-GAS
- SUPERCONDUCTIVITY
- FERROMAGNETISM
- COEXISTENCE
- SURFACE
- OXIDES
- FIELD
- STATE