Magnetotransport effects in polar versus non-polar SrTiO3 based heterostructures

Article

关键词: ELECTRON-GAS;    INTERFACE;    SUPERCONDUCTIVITY;    FERROMAGNETISM;    COEXISTENCE;    FIELD;   

DOI  :  10.1103/PhysRevB.86.121104

来源: SCIE

【 摘 要 】

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.

【 授权许可】

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