Signature of enhanced spin-orbit interaction in the magnetoresistance of LaTiO3/SrTiO3 interfaces on delta doping

Article

关键词: SEMICONDUCTOR QUANTUM-WELL;    MAGNETIC-FIELD PARALLEL;    WEAK-LOCALIZATION;    CONDUCTION ELECTRONS;    INVERSION-LAYERS;    ANTILOCALIZATION;    PRECESSION;    TRANSITION;    ANISOTROPY;    LACOO3;   

DOI  :  10.1103/PhysRevB.94.115165

来源: SCIE

【 摘 要 】

We present a study of modulation of spin-orbit interaction ( SOI) at the interface of LaTiO3/SrTiO3 by delta doping with an isostructural ferromagnetic perovskite LaCoO3. The sheet carrier density at the interface decreases exponentially with delta-doping thickness. We have explored that the spin-orbit scattering time ( tau(so)) can be decreased by nearly three orders of magnitude, whereas the inelastic scattering time ( tau(i)) remains almost constant with delta-doping thickness. We have also observed that the tau(i) varies almost inversely proportional to temperature and tau(so) remains insensitive to temperature, which suggest that the spin relaxation in these interfaces follows D'yakonov-Perel mechanism. The observed in-plane anisotropic magnetoresistance is attributed to the mixing of the spin-up and spin-down states of the d band at the Fermi level due to SOI.

【 授权许可】

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