Lattice distortions and the metal-insulator transition in pure and Ti-substituted Ca3Ru2O7

V. Petkov, T. Durga Rao, A. Zafar, A. M.Milinda Abeykoon, E. Fletcher, J. Peng, Z. Q. Mao, X. Ke

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We report pair distribution function studies on the relationship between the metal-insulator transition (MIT) and lattice distortions in pure and Ti-substituted bilayer Ca3Ru2O7. Structural refinements performed as a function of temperature, magnetic field and length scale reveal the presence of lattice distortions not only within but also orthogonal to the bilayers. Because of the distortions, the local and average crystal structure differ across a broad temperature region extending from room temperature to temperatures below the MIT. The coexistence of distinct lattice distortions is likely to be behind the marked structural flexibility of Ca3Ru2O7 under external stimuli. This observation highlights the ubiquity of lattice distortions in an archetypal Mott system and calls for similar studies on other families of strongly correlated materials.

Original languageEnglish (US)
Article number015402
JournalJournal of Physics Condensed Matter
Issue number1
StatePublished - Jan 11 2023

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics


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