Large Rashba spin-orbit coupling in metallic SrTaO$_3$ thin films
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866913271920984064 |
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| author | Okuma, Hikaru Katayama, Yumiko Kadowaki, Fukunobu Tokumoto, Yuki Ueno, Kazunori |
| author_facet | Okuma, Hikaru Katayama, Yumiko Kadowaki, Fukunobu Tokumoto, Yuki Ueno, Kazunori |
| contents | 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 splitting due to spin-orbit coupling ($Δ$$_{so}$) and Rashba parameter ($α$$_R$) were deduced from an analysis of a magnetoresistance using two-dimensional weak antilocalization theory. The values of $Δ$$_{so}$ ranged from 26 to 120 meV, which were the largest among other metallic oxide films, such as SrNbO$_3$, SrIrO$_3$, and La$_{2/3}$Sr$_{1/3}$MnO$_3$ thin films, indicating that spin-orbit coupling in SrTaO$_3$ was the largest among the metallic perovskite oxides reported so far. The values of $α$$_R$ for our SrTaO$_3$ films ranged from $8.8 \times$10$^{-13}$ to $1.7 \times$10$^{-12}$ eV m, which were much larger than those reported for other metallic oxide thin films. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2403_12612 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Large Rashba spin-orbit coupling in metallic SrTaO$_3$ thin films Okuma, Hikaru Katayama, Yumiko Kadowaki, Fukunobu Tokumoto, Yuki Ueno, Kazunori Strongly Correlated Electrons 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 splitting due to spin-orbit coupling ($Δ$$_{so}$) and Rashba parameter ($α$$_R$) were deduced from an analysis of a magnetoresistance using two-dimensional weak antilocalization theory. The values of $Δ$$_{so}$ ranged from 26 to 120 meV, which were the largest among other metallic oxide films, such as SrNbO$_3$, SrIrO$_3$, and La$_{2/3}$Sr$_{1/3}$MnO$_3$ thin films, indicating that spin-orbit coupling in SrTaO$_3$ was the largest among the metallic perovskite oxides reported so far. The values of $α$$_R$ for our SrTaO$_3$ films ranged from $8.8 \times$10$^{-13}$ to $1.7 \times$10$^{-12}$ eV m, which were much larger than those reported for other metallic oxide thin films. |
| title | Large Rashba spin-orbit coupling in metallic SrTaO$_3$ thin films |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2403.12612 |