Magnetotransport effects in polar versus non-polar SrTiO3 based heterostructures

E. Flekser; M. Ben Shalom; M. Kim; C. Bell; Y. Hikita; H. Y. Hwang; Y. Dagan; Chris Bell

doi:10.1103/PhysRevB.86.121104

Magnetotransport effects in polar versus non-polar SrTiO3 based heterostructures

E. Flekser^*, M. Ben Shalom, M. Kim, C. Bell, Y. Hikita, H. Y. Hwang, Y. Dagan, Chris Bell

^*Corresponding author for this work

School of Physics

Research output: Contribution to journal › Article (Academic Journal) › peer-review

24 Citations (Scopus)

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
Article number	121104
Number of pages	5
Journal	Physical Review B: Condensed Matter and Materials Physics
Volume	86
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevB.86.121104
Publication status	Published - 11 Sept 2012

Keywords

LAALO3/SRTIO3 INTERFACE
ELECTRON-GAS
SUPERCONDUCTIVITY
FERROMAGNETISM
COEXISTENCE
SURFACE
OXIDES
FIELD
STATE

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@article{0b96bad177b1410f870a3220b932695b,

title = "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.",

keywords = "LAALO3/SRTIO3 INTERFACE, ELECTRON-GAS, SUPERCONDUCTIVITY, FERROMAGNETISM, COEXISTENCE, SURFACE, OXIDES, FIELD, STATE",

author = "E. Flekser and \{Ben Shalom\}, M. and M. Kim and C. Bell and Y. Hikita and Hwang, \{H. Y.\} and Y. Dagan and Chris Bell",

year = "2012",

month = sep,

day = "11",

doi = "10.1103/PhysRevB.86.121104",

language = "English",

volume = "86",

journal = "Physical Review B: Condensed Matter and Materials Physics",

issn = "1098-0121",

publisher = "American Physical Society (APS)",

number = "12",

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TY - JOUR

T1 - Magnetotransport effects in polar versus non-polar SrTiO3 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.

AU - Bell, Chris

PY - 2012/9/11

Y1 - 2012/9/11

N2 - 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.

AB - 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.

KW - LAALO3/SRTIO3 INTERFACE

KW - ELECTRON-GAS

KW - SUPERCONDUCTIVITY

KW - FERROMAGNETISM

KW - COEXISTENCE

KW - SURFACE

KW - OXIDES

KW - FIELD

KW - STATE

U2 - 10.1103/PhysRevB.86.121104

DO - 10.1103/PhysRevB.86.121104

M3 - Article (Academic Journal)

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 -

Magnetotransport effects in polar versus non-polar SrTiO3 based heterostructures

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Keywords

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