Phonon density of states of the quasi-one-dimensional molybdenum selenides M sub 2 Mo sub 6 Se sub 6 ( M =Tl, In, Rb, and vacancy): Evidence of Einstein-like M -atom modes in the superconducting compounds

Journal Article · Sun Apr 01 00:00:00 EST 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.41.6315· OSTI ID:7121837

Brusetti, R ^[1]; Dianoux, A J ^[2]; Gougeon, P; Potel, M ^[3]; Bonjour, E; Calemczuk, R ^[4]

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1. Centre de Recherche sur les Tres Basses Temperatures, Centre National de la Recherche Scientifique, Boite Postale 166X, 38042 Grenoble CEDEX, France (FR)
2. Institut Lauee-Langevin, Boite Postale 156X, 38042 Grenoble CEDEX, France (FR)
3. Laboratoire de Chimie Minerale B, 35042 Rennes CEDEX, France (FR)
4. Service des Basses Temperatures, Centre d'Etudes Nucleaires de Grenoble, Boite Postale 85X, 38041 Grenoble CEDEX (FR) Laboratoire de Cryophysique, Centre d'Etudes Nucleaires de Grenoble, Boite Postale 85X, 38041 Grenoble CEDEX, France (FR)

We have measured the generalized phonon density of states (DOS) {ital G}({omega}) of the quasi-one-dimensional compounds {ital M}{sub 2}Mo{sub 6}Se{sub 6} ({ital M}=Tl, In, Rb, and vacancy) by inelastic neutron scattering on polycrystalline samples. From the comparison with the specific-heat data, we derived the unweighted density of states {ital g}({omega}). The DOS spectra can be consistently interpreted as the superposition of a low-energy peak corresponding to the Einstein-like vibrations of the {ital M} atoms and of the characteristic spectrum of the Mo{sub 6}Se{sub 6} skeleton. The particular features of the In{sub 2}Mo{sub 6}Se{sub 6} and Tl{sub 2}Mo{sub 6}Se{sub 6} spectra are discussed in connection with the occurrence of superconductivity in these compounds ({ital T}{sub {ital c}}{approx equal}3 and 6.5 K, respectively).

• OSTI ID: 7121837
• Journal Information: Physical Review, B: Condensed Matter; (USA), Vol. 41:10; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
INDIUM
PHONONS
MOLYBDENUM SELENIDES
RUBIDIUM SELENIDES
THALLIUM SELENIDES
ELECTRONIC STRUCTURE
INELASTIC SCATTERING
NEUTRON DIFFRACTION
POLYCRYSTALS
SPECIFIC HEAT
SUPERCONDUCTORS
ULTRALOW TEMPERATURE
VACANCIES
ALKALI METAL COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
DIFFRACTION
ELEMENTS
METALS
MOLYBDENUM COMPOUNDS
PHYSICAL PROPERTIES
POINT DEFECTS
QUASI PARTICLES
REFRACTORY METAL COMPOUNDS
RUBIDIUM COMPOUNDS
SCATTERING
SELENIDES
SELENIUM COMPOUNDS
THALLIUM COMPOUNDS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
360603* - Materials- Properties
656100 - Condensed Matter Physics- Superconductivity