RT Journal Article
T1 Electrically switchable and tunable rashba-type spin splitting in covalent perovskite oxides
A1 Varignon, Julien
A1 Santamaría Sánchez-Barriga, Jacobo
A1 Bibes, Manuel
AB In transition-metal perovskites (ABO_3) most physical properties are tunable by structural parameters such as the rotation of the BO_6 octahedra. Examples include the Neel temperature of orthoferrites, the conductivity of mixed-valence manganites, or the band gap of rare-earth scandates. Since oxides often hold large internal electric dipoles and can accommodate heavy elements, they also emerge as prime candidates to display Rashba spin-orbit coupling, through which charge and spin currents may be efficiently interconverted. However, despite a few experimental reports in SrTiO_3-based interface systems, the Rashba interaction has been little studied in these materials, and its interplay with structural distortions remains unknown. In this Letter, we identify a bismuth-based perovskite with a large, electrically switchable Rashba interaction whose amplitude can be controlled by both the ferroelectric polarization and the breathing mode of oxygen octahedra. This particular structural parameter arises from the strongly covalent nature of the Bi-O bonds, reminiscent of the situation in perovskite nickelates. Our results not only provide novel strategies to craft agile spin-charge converters but also highlight the relevance of covalence as a powerful handle to design emerging properties in complex oxides.
PB American Physical Society
SN 0031-9007
YR 2019
FD 2019-03-22
LK https://hdl.handle.net/20.500.14352/13324
UL https://hdl.handle.net/20.500.14352/13324
LA eng
NO ©2019 American Physical SocietyThis work has been supported by the European Research Council (ERC) Consolidator Grant MINT under the Contract No. 615759. Calculations took advantage of the Occigen machines through the DARI project EPOC No. A0020910084 and of the DECI resource FIONN in Ireland at Irish Centre for High-End Computing (ICHEC) through the PRACE project FiPSCO. J. V. acknowledges technical help from Adam Ralph from ICHEC.
NO Unión Europea. FP7
NO DARI project EPOC
DS Docta Complutense
RD 27 abr 2024