Electronically driven spin-reorientation transition of the correlated polar metal Ca3Ru2O7

Igor Markovic, Matthew David Watson, Oliver Jon Clark, Federico Mazzola, Edgar Abarca Morales, Chris Hooley, Helge Rosner, Craig M. Polley, Thiagarajan Balasubramanian, Saumya Mukherjee, Naoki Kikugawa, Dmitry A. Sokolov, Andrew Mackenzie, Phil D. C. King

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


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 Ca3Ru2O7, a 4d 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.
Original languageEnglish
Pages (from-to)15524-15529
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number27
Early online date23 Jun 2020
Publication statusPublished - 7 Jul 2020


  • Ruthenate
  • Magnetism
  • Correlated oxide
  • Rashba spin-orbit
  • Angle-resolved photoemission


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