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Large Rashba spin-orbit coupling in metallic SrTaO$_3$ thin films
Hikaru Okuma, Yumiko Katayama, Fukunobu Kadowaki, Yuki Tokumoto, Kazunori Ueno
https://arxiv.org/abs/2403.12612 <…

Large Rashba spin-orbit coupling in metallic SrTaO$_3$ thin films
Epitaxial thin films of SrTaO$_3$ with thickness ($t$) smaller than 74 nm were successfully fabricated on an insulator (LaAlO$_3$)$_{0.3}$(Sr$_2$AlTaO$_6$)$_{0.7}$ substrate. Films with $t$ above 8.6 nm showed metallic conduction. Both conductivity and a mobility showed a decrease with increasing $t$ above 42 nm, suggesting the instability of thick SrTaO$_3$ films. This instability was also supported by TEM image and XRD intensity. For the metallic films with $t$ below 25 nm, energy band splitt…