Raman-scattering study of the charge and spin dynamics of the layered ruthenium oxide Ca{sub 3}Ru{sub 2}O{sub 7}

Journal Article · Wed Sep 01 00:00:00 EDT 1999 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.60.R6980· OSTI ID:686454

Liu, H L; Yoon, S; Cooper, S L ^[1]; Cao, G; Crow, J E ^[2]

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1. Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)
2. National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310 (United States)

We report a Raman-scattering study of the relationship among the charge, spin, and lattice dynamics of Ca{sub 3}Ru{sub 2}O{sub 7}. The metal-insulator (MI) transition (T{sub MI}{approximately}48 K) in this compound manifests itself as a rapid suppression of low-frequency electronic scattering intensity, reflecting the opening of a charge gap, {Delta}{sub c}{approximately}760 cm{sup {minus}1}, and a concomitant softening and broadening of the 438 cm{sup {minus}1} out-of-phase oxygen phonon mode. Furthermore, the transition to antiferromagnetic order below T{sub N}{approximately}56 K is associated with the development of a B{sub 1g} resonance peak near 58 cm{sup {minus}1}. We identify this feature as a two-magnon process, based upon which we estimate an in-plane antiferromagnetic exchange coupling of J{sub {parallel}}{approximately}8.7 cm{sup {minus}1} in Ca{sub 3}Ru{sub 2}O{sub 7}. {copyright} {ital 1999} {ital The American Physical Society}

• OSTI ID: 686454
• Journal Information: Physical Review, B: Condensed Matter, Vol. 60, Issue 10; Other Information: PBD: Sep 1999
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALCIUM COMPOUNDS
RAMAN SPECTRA
LATTICE PARAMETERS
SPIN
ORDER PARAMETERS
ANTIFERROMAGNETISM
ANTIFERROMAGNETIC MATERIALS
LAYERS
RUTHENIUM OXIDES
CALCIUM OXIDES
MAGNONS
ENERGY GAP
PHASE DIAGRAMS
EXCHANGE INTERACTIONS
RESONANCE
LINE BROADENING