Structural phase transition induced by the Jahn-Teller effect. Antiferrodistortive ordering View Full Text


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Article Info

DATE

1976-12

AUTHORS

G. Schröder, H. Thomas

ABSTRACT

We study the phase transitions induced by the Jahn-Teller effect ofE-doublet ions in a cubic crystal with antiferrodistortive interactions. AnS=1 pseudospin model is constructed which takes the three lowest vibronic levels of the Jahn-Teller complexes into account. We find a second-order phase transition to a tetragonal phase with two inequivalent sublattices. The transitions between the vibronic levels give rise to bands of collective vibronic excitations with strongly temperature-dependent frequencies. The nature of the various modes is analyzed in detail. We also study the coupling to the elastic displacement field of the crystal. For a sufficiently large coupling constant, this coupling stabilizes a different low-temperature tetragonal phase with two equivalent sublattices. In a certain region of coupling constants, a transition occurs between the two tetragonal phases by second-order transitions to an intermediate phase of lower symmetry. The influence of the coupling on the dynamic behaviour is discussed. More... »

PAGES

369-380

References to SciGraph publications

  • 1969. Der Jahn-Teller-Effekt in FESTKÖRPERPROBLEME 9
  • Identifiers

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    http://scigraph.springernature.com/pub.10.1007/bf01315253

    DOI

    http://dx.doi.org/10.1007/bf01315253

    DIMENSIONS

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