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Electronically driven spin-reorientation transition of the correlated polar metal Ca3Ru2O7.
Markovic, Igor; Watson, Matthew D; Clark, Oliver J; Mazzola, Federico; Abarca Morales, Edgar; Hooley, Chris A; Rosner, Helge; Polley, Craig M; Balasubramanian, Thiagarajan; Mukherjee, Saumya; Kikugawa, Naoki; Sokolov, Dmitry A; Mackenzie, Andrew P; King, Phil D C.
Affiliation
  • Markovic I; Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St Andrews, St Andrews KY16 9SS, United Kingdom.
  • Watson MD; Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany.
  • Clark OJ; Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St Andrews, St Andrews KY16 9SS, United Kingdom.
  • Mazzola F; Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St Andrews, St Andrews KY16 9SS, United Kingdom.
  • Abarca Morales E; Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St Andrews, St Andrews KY16 9SS, United Kingdom.
  • Hooley CA; Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St Andrews, St Andrews KY16 9SS, United Kingdom.
  • Rosner H; Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany.
  • Polley CM; Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St Andrews, St Andrews KY16 9SS, United Kingdom.
  • Balasubramanian T; Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany.
  • Mukherjee S; MAX IV Laboratory, Lund University, 221 00 Lund, Sweden.
  • Kikugawa N; MAX IV Laboratory, Lund University, 221 00 Lund, Sweden.
  • Sokolov DA; Diamond Light Source, Didcot, OX11 0DE, United Kingdom.
  • Mackenzie AP; National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan.
  • King PDC; Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany.
Proc Natl Acad Sci U S A ; 117(27): 15524-15529, 2020 Jul 07.
Article in En | MEDLINE | ID: mdl-32576687
ABSTRACT
The interplay between spin-orbit coupling and structural inversion symmetry breaking in solids has generated much interest due to the nontrivial spin and magnetic textures which can result. Such studies are typically focused on systems where large atomic number elements lead to strong spin-orbit coupling, in turn rendering electronic correlations weak. In contrast, here we investigate the temperature-dependent electronic structure of [Formula see text], a [Formula see text] oxide metal for which both correlations and spin-orbit coupling are pronounced and in which octahedral tilts and rotations combine to mediate both global and local inversion symmetry-breaking polar distortions. Our angle-resolved photoemission measurements reveal the destruction of a large hole-like Fermi surface upon cooling through a coupled structural and spin-reorientation transition at 48 K, accompanied by a sudden onset of quasiparticle coherence. We demonstrate how these result from band hybridization mediated by a hidden Rashba-type spin-orbit coupling. This is enabled by the bulk structural distortions and unlocked when the spin reorients perpendicular to the local symmetry-breaking potential at the Ru sites. We argue that the electronic energy gain associated with the band hybridization is actually the key driver for the phase transition, reflecting a delicate interplay between spin-orbit coupling and strong electronic correlations and revealing a route to control magnetic ordering in solids.
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