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 J∥8.7 cm-1 in Ca3Ru2O7.
|Physical Review B - Condensed Matter and Materials Physics
|Published - 1999
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics