Magnetic Interactions and the Pressure Phase Diagram of CuGeO{sub 3}

Journal Article · Wed Jan 01 04:00:00 EST 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.78.487· OSTI ID:439082

van Loosdrecht, P; Zeman, J; Martinez, G ^[1]; Dhalenne, G; Revcolevschi, A ^[2]

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1. Grenoble High Magnetic Field Laboratory, Max-Planck-Institut fuer Festkoerperforschung and Centre National de la Recherche Scientifique, 25 Avenue des Martyrs, BP 166, F-38042 Grenoble Cedex 9 (France)
2. Laboratoire de Chimie des Solides, Univerite de Paris-Sud, Batiment 414, F-91405 Orsay (France)

A pressure and temperature dependent Raman study of the vibrational and spin dynamics in CuGeO{sub 3} is presented. A new low temperature, high pressure phase has been identified, and a pressure-temperature phase diagram is proposed for CuGeO{sub 3}. The pressure dependence of the effective exchange interaction, of the spin-Peierls gap and of the spin-Peierls temperature, strongly supports a model in which next-nearest-neighbor interactions stabilize the spin-Peierls ground state. The Raman data allow for a quantitative estimate of the pressure dependence of the next-nearest-neighbor interactions. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 439082
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 3 Vol. 78; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COPPER OXIDES
CRYSTAL STRUCTURE
EXCHANGE INTERACTIONS
GERMANIUM OXIDES
MAGNONS
PHASE DIAGRAMS
PRESSURE DEPENDENCE
RAMAN SPECTRA
TEMPERATURE DEPENDENCE
VIBRATIONAL STATES