TY - JOUR
T1 - Magnetotransport effects in polar versus non-polar SrTiO 3 based heterostructures
AU - Flekser, E.
AU - Ben Shalom, M.
AU - Kim, M.
AU - Bell, C.
AU - Hikita, Y.
AU - Hwang, H. Y.
AU - Dagan, Y.
PY - 2012/9/11
Y1 - 2012/9/11
N2 - Anisotropic magnetoresistance and negative magnetoresistance for in-plane fields are compared for the LaAlO 3/SrTiO 3 interface and the symmetric Nb-doped SrTiO 3 heterostructure. Both effects are exceptionally strong in LaAlO 3/SrTiO 3. 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 SrTiO 3. These results clarify contradicting transport interpretations in SrTiO 3 based heterostructures.
AB - Anisotropic magnetoresistance and negative magnetoresistance for in-plane fields are compared for the LaAlO 3/SrTiO 3 interface and the symmetric Nb-doped SrTiO 3 heterostructure. Both effects are exceptionally strong in LaAlO 3/SrTiO 3. 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 SrTiO 3. These results clarify contradicting transport interpretations in SrTiO 3 based heterostructures.
UR - http://www.scopus.com/inward/record.url?scp=84866523176&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.86.121104
DO - 10.1103/PhysRevB.86.121104
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AN - SCOPUS:84866523176
SN - 1098-0121
VL - 86
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 12
M1 - 121104
ER -