Symmetry-mode and spontaneous strain analysis of the structural transitions in Fe1+yTe and REFeAsO compounds (Articolo in rivista)

Type
Label
  • Symmetry-mode and spontaneous strain analysis of the structural transitions in Fe1+yTe and REFeAsO compounds (Articolo in rivista) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/0953-8984/25/12/125703 (literal)
Alternative label
  • Martinelli A. (2013)
    Symmetry-mode and spontaneous strain analysis of the structural transitions in Fe1+yTe and REFeAsO compounds
    in Journal of physics. Condensed matter (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Martinelli A. (literal)
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  • 25 (literal)
Rivista
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  • 9 (literal)
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  • 12 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • SPIN-CNR, Corso Perrone 24, I-16152 Genova, Italy (literal)
Titolo
  • Symmetry-mode and spontaneous strain analysis of the structural transitions in Fe1+yTe and REFeAsO compounds (literal)
Abstract
  • Symmetry-mode and spontaneous strain analysis has been carried out for the structural transitions taking place in Fe(1+y)Te and REFeAsO compounds on cooling from room temperature. The P4/nmm -> P21/m structural transition occurring in Fe(1+y)Te is induced by a single irreducible representation E(g), indicating a pure ferroelastic transition. The increase of the interstitial Fe content hinders the displacement of the Te atoms according to the E(g) mode; as a result this mode is progressively suppressed in favour of the A(2g) mode. As a consequence the Pmmn polymorphic modification is stabilized, but in this case the P4/nmm -> Pmmn transition is not ferroelastic. The P4/nmm -> Cmme structural transition taking place in REFeAsO compounds is induced by a single irreducible representation B(2g), which is not active at the occupied sites. Hence, the transition is not driven by the condensation of a collective atomic displacement, but is likely characterized by a pseudo-proper ferroelastic behaviour. (literal)
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