Magnetotransport effects in polar versus non-polar SrTiO3 based heterostructures
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.
- Publication:
-
Physical Review B
- Pub Date:
- September 2012
- DOI:
- 10.1103/PhysRevB.86.121104
- arXiv:
- arXiv:1207.6057
- Bibcode:
- 2012PhRvB..86l1104F
- Keywords:
-
- 75.70.Cn;
- 73.40.-c;
- Magnetic properties of interfaces;
- Electronic transport in interface structures;
- Condensed Matter - Strongly Correlated Electrons;
- Condensed Matter - Mesoscale and Nanoscale Physics;
- Condensed Matter - Superconductivity
- E-Print:
- 5 pages, 5 figures