Raman-scattering study of the charge and spin dynamics of the layered ruthenium oxide Ca3Ru2O7

H. L. Liu, S. Yoon, S. L. Cooper, G. Cao, J. E. Crow

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Abstract

We report a Raman-scattering study of the relationship among the charge, spin, and lattice dynamics of Ca3Ru2O7. The metal-insulator (MI) transition (TMI48K) in this compound manifests itself as a rapid suppression of low-frequency electronic scattering intensity, reflecting the opening of a charge gap, Δc760 cm-1, and a concomitant softening and broadening of the 438 cm-1 out-of-phase oxygen phonon mode. Furthermore, the transition to antiferromagnetic order below TN56K is associated with the development of a B1g resonance peak near 58 cm-1. We identify this feature as a two-magnon process, based upon which we estimate an in-plane antiferromagnetic exchange coupling of J8.7 cm-1 in Ca3Ru2O7.

Original languageEnglish
Pages (from-to)R6980-R6983
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume60
Issue number10
DOIs
Publication statusPublished - 1999 Jan 1

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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