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

Abstract

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}

Authors:
; ;  [1]; ;  [2]
  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)
Publication Date:
OSTI Identifier:
686454
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 60; Journal Issue: 10; Other Information: PBD: Sep 1999
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Liu, H.L., Yoon, S., Cooper, S.L., Cao, G., and Crow, J.E. Raman-scattering study of the charge and spin dynamics of the layered ruthenium oxide Ca{sub 3}Ru{sub 2}O{sub 7}. United States: N. p., 1999. Web. doi:10.1103/PhysRevB.60.R6980.
Liu, H.L., Yoon, S., Cooper, S.L., Cao, G., & Crow, J.E. Raman-scattering study of the charge and spin dynamics of the layered ruthenium oxide Ca{sub 3}Ru{sub 2}O{sub 7}. United States. doi:10.1103/PhysRevB.60.R6980.
Liu, H.L., Yoon, S., Cooper, S.L., Cao, G., and Crow, J.E. Wed . "Raman-scattering study of the charge and spin dynamics of the layered ruthenium oxide Ca{sub 3}Ru{sub 2}O{sub 7}". United States. doi:10.1103/PhysRevB.60.R6980.
@article{osti_686454,
title = {Raman-scattering study of the charge and spin dynamics of the layered ruthenium oxide Ca{sub 3}Ru{sub 2}O{sub 7}},
author = {Liu, H.L. and Yoon, S. and Cooper, S.L. and Cao, G. and Crow, J.E.},
abstractNote = {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}},
doi = {10.1103/PhysRevB.60.R6980},
journal = {Physical Review, B: Condensed Matter},
number = 10,
volume = 60,
place = {United States},
year = {1999},
month = {9}
}