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Dynamics of xenon, krypton, and methane monolayers in registry with graphite

Journal Article · · Phys. Rev. B: Condens. Matter; (United States)
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The self-consistent phonon (SCP) theory is used to study the dynamics of monolayers of xenon, krypton, and methane adsorbed on graphite. Only the ..sqrt..3 x ..sqrt..3 solid phase is considered. It is shown that the phonon energies of the Xe monolayers are very similar to those of their floating counterparts, while the interaction of the Kr and CH/sub 4/ monolayers with the graphite significantly affects the phonon dispersion curves. The gap in the phonon dispersion curves at the center of the Brillouin zone is computed as a function of temperature. At a critical temperature, the gap goes spontaneously to zero and a transition from a locked-in commensurate phase to a floating phase takes place. This transition appears to describe the commensurate to floating transition in CH/sub 4/ well. A simple model of the floating transition is compared to the full SCP calculations. The one-phonon dynamic form factor, including the cubic anharmonic term, and phonon lifetimes are also evaluated for Kr and CH/sub 4/.
Research Organization:
Department of Physics, University of Delaware, Newark, Delaware 19716
OSTI ID:
5529599
Journal Information:
Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 37:2; ISSN PRBMD
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
656002 -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ADSORPTION
ALKANES
BRILLOUIN ZONES
CARBON
DISPERSION RELATIONS
DYNAMICS
ELEMENTAL MINERALS
ELEMENTS
FLUIDS
GASES
GRAPHITE
HYDROCARBONS
KRYPTON
LAYERS
MECHANICS
METHANE
MINERALS
NONMETALS
ORGANIC COMPOUNDS
PHASE TRANSFORMATIONS
PHONONS
QUASI PARTICLES
RARE GASES
SELF-CONSISTENT FIELD
SOLIDS
SORPTION
SORPTIVE PROPERTIES
SUBSTRATES
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
XENON
ZONES