q sub 1 charge-density wave in NbSe sub 3

Journal Article · Mon Jul 09 04:00:00 EDT 1990 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.65.223· OSTI ID:6727150

Moudden, A H; Axe, J D; Monceau, P; Levy, F ^[1]

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1. Laboratoire Leon Brillouin, Commissariat a l'Energie Atomique-Centre National de la Recherche Scientifique, Centre d'Etudes Nucleaires de Saclay, F-91191 Gif-sur-Yvette (France) Department of Physics, Brookhaven National Laboratory, Upton, NY (USA) Centre de Recherche sur les Tres Basses Temperatures, Centre National de la Recherche Scientifique, Boite Postale 166X, F-38042 Grenoble CEDEX (France) Institut de Physique Appliquee, Ecole Polytechnique Federale, CH-1015 Lausanne (Switzerland)

Using synchrotron x-ray-scattering measurements on NbSe{sub 3}, we show that the diffuse scattering associated with the {ital q}{sub 1} charge-density-wave fluctiations are rods perpendicular to the ({ital a},{ital b}) planes reflecting a 2D regime of fluctuations with an in-plane anisotropy {xi}{sub {ital b}}{sup *}/{xi}{sub {ital a}}{sup *}=3.5{plus minus}0.5. The plane of the 2D fluctuations is likely to be formed by the chains with the shortest Se-Se pairing. The 3D coupling sets in within 2 K above the transition temperature {ital T}{sub 1}{approx}150 K with an out-of-plane anisotropy {xi}{sub {ital b}}{sup *}/{xi}{sub {ital c}}{sup *}=27{plus minus}2. {ital q}{sub 1} has a significant temperature variation from about 0.2445(1) at {ital T}{sub 1} to 0.2411(1) at about 80 K and then remians constant to the lowest temperatures. Upon cooling, the incommensurate wave vector is driven far away from the commensurate value 1/4. No anomaly in either the amplitude or the phase of {ital q}{sub 1} is observed at the second charge-density-wave transition.

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6727150
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 65:2; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
BREMSSTRAHLUNG
CHALCOGENIDES
COOLING
ELECTROMAGNETIC RADIATION
FLUCTUATIONS
LOW TEMPERATURE
NIOBIUM COMPOUNDS
NIOBIUM SELENIDES
PLASMA WAVES
RADIATIONS
REFRACTORY METAL COMPOUNDS
SELENIDES
SELENIUM COMPOUNDS
SYNCHROTRON RADIATION
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
TWO-DIMENSIONAL CALCULATIONS
VARIATIONS