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14N NMR study and Landau theory of phase transitions in [N(CH3)4]2ZnI4

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Zeitschrift für Physik B Condensed Matter

Abstract

The14N NMR spectra and spin-lattice relaxation timeT 1 of [N(CH3)4]2ZnI4 have been studied between room temperature and 200 K. Two phase transitions atT c 1=255 K and atT c 1=217 K are observed. The14N NMR lineshape andT 1 data suggest that the intermediate phase is commensurate rather than incommensurate in spite of the presence of a Lifshitz invariant in the expansion of the free energy density in powers of the order parameter. We also discuss the phenomenological theory of structural phase transitions in [N(CH3)4]2ZnI4.

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Authors and Affiliations

  1. “J. Stefan” Institute, Jamova 39/p.p. 100, YU-61111, Ljubljana, Yugoslavia

    A. M. Fajdiga, J. Dolinšek & R. Blinc

  2. Institute of Crystallography, USSR Academy of Sciences, Moscow, USSR

    A. P. Levanyuk

  3. Physique du Solide-UA 785, Université de Bourgonge, Dijon, France

    R. Perret

  4. Institute für Quantenelektronik, ETH, Hönggerberg, CH-8093, Zürich, Switzerland

    H. Arend & R. Kind

Authors
  1. A. M. Fajdiga
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  2. J. Dolinšek
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  3. R. Blinc
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  4. A. P. Levanyuk
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  5. R. Perret
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  6. H. Arend
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  7. R. Kind
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Fajdiga, A.M., Dolinšek, J., Blinc, R. et al. 14N NMR study and Landau theory of phase transitions in [N(CH3)4]2ZnI4 . Z. Physik B - Condensed Matter 77, 329–332 (1989). https://doi.org/10.1007/BF01313677

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  • DOI: https://doi.org/10.1007/BF01313677

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