Soft longitudinal modes in spin-singlet CuGeO[sub 3]

Journal Article · Fri Jul 01 04:00:00 EDT 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.50.1278· OSTI ID:7045037

Lorenzo, J E; Hirota, K; Shirane, G; Tranquada, J M ^[1]; Hase, M; Uchinokura, K ^[2]; Kojima, H; Tanaka, I; Shibuya, Y ^[3]

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1. Department of Physics, Brookhaven National Laboratory, Upton, New York 11973 (United States)
2. Department of Applied Physics, The University of Tokyo, Bunkyo-ku, Tokyo 113 (Japan)
3. Institute of Inorganic Synthesis, Yamanashi University, Kofu-shi, Yamanashi 400 (Japan)

We present results from a neutron-scattering study of lattice anomalies associated with the transition to the gapped spin-singlet state observed in the spin-1/2 linear-chain compound CuGeO[sub 3]. Instead of the lattice dimerization along the chain direction ([ital c] axis) expected for a spin-Peierls system, we observe a remarkable softening of the longitudinal acoustic phonons in a direction (along the [ital b] axis) perpendicular to the chains. A spontaneous strain appears in the same direction below the magnetic transition temperature of 14 K.

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 7045037
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 50:2; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360606* -- Other Materials-- Physical Properties-- (1992-)
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
DIFFRACTION
DISPERSIONS
GERMANIUM COMPOUNDS
GERMANIUM OXIDES
MIXTURES
NEUTRON DIFFRACTION
OXIDES
OXYGEN COMPOUNDS
PHONONS
PHYSICAL PROPERTIES
QUASI PARTICLES
SCATTERING
STRAINS
TEMPERATURE RANGE
TEMPERATURE RANGE 0000-0013 K
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE