Magnetotransport effects in polar versus non-polar SrTiO${}_{3}$ based heterostructures

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Magnetotransport effects in polar versus non-polar SrTiO $_{3}$ based heterostructures

E. Flekser, M. Ben Shalom, M. Kim, C. Bell, Y. Hikita, H. Y. Hwang, and Y. Dagan

Phys. Rev. B 86, 121104(R) – Published 11 September 2012

Abstract

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.

Received 28 May 2012

DOI:https://doi.org/10.1103/PhysRevB.86.121104

Authors & Affiliations

E. Flekser¹, M. Ben Shalom¹, M. Kim², C. Bell², Y. Hikita², H. Y. Hwang², and Y. Dagan¹

¹Raymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv University, Tel Aviv 69978, Israel
²Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA

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Issue

Vol. 86, Iss. 12 — 15 September 2012

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Physical Review B

covering condensed matter and materials physics