Large Rashba parameter for 4d strongly correlated perovskite oxide SrNbO3 ultrathin films

TL;DR

This study investigates the spin relaxation in ultrathin SrNbO3 films, revealing a large Rashba parameter and dominant D'Yakonov Perel' mechanism, indicating strong spin-orbit coupling in these strongly correlated oxide films.

Contribution

The paper reports the largest Rashba parameters observed in ultrathin metallic oxide films, advancing understanding of spin-orbit effects in strongly correlated perovskite oxides.

Findings

Spin orbit scattering time inversely proportional to momentum scattering time.

D'Yakonov Perel' mechanism dominates spin relaxation.

Record-high Rashba parameters in SrNbO3 ultrathin films.

Abstract

To elucidate the spin relaxation mechanism of SrNbO3 (SNO) ultrathin films, the transport properties of a series of SNO films with various thicknesses were measured on both sides of the metal insulator transition. The spin orbit scattering time was deduced from the analysis of the magnetoresistance with weak antilocalization theory, and it was found that the spin orbit scattering time was inversely proportional to the momentum scattering time. This result was explained in terms of the D`Yakonov Perel` mechanism, indicative of the dominant Rashba effect. The values of the Rashba parameter were largest in the values reported for other ultrathin films of metallic oxides.