Title
Microscopic theory of orientational disorder and lattice instability in solid <tex>$C_{70}$</tex>Microscopic theory of orientational disorder and lattice instability in solid <tex>$C_{70}$</tex>
Author
Faculty/Department
Faculty of Sciences. Physics
Research group
Condensed Matter Theory
Statistical Physics
Publication type
article
Publication
Lancaster, Pa,
Subject
Physics
Source (journal)
Physical review : B : condensed matter and materials physics. - Lancaster, Pa, 1998 - 2015
Volume/pages
52(1995):21, p. 15279-15290
ISSN
1098-0121
1550-235X
ISI
A1995TK97900042
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
We have developed a microscopic theory which describes the orientational dynamics of C-70 molecules and its coupling to lattice displacements in the face-centered-cubic phase of C-70 fullerite. The single-molecule orientational density distribution in the disordered phase is calculated. The ferroelastic transition to the rhombohedral phase is investigated. The discontinuity of the orientational order parameter at the phase transition is calculated. It is found that the transition leads to a stretching of the primitive unit cell along a [111] cubic direction. A softening of the elastic constant c(44) at the transition is predicted.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/d9a13f/4294.pdf
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