Cooperative Cluster Jahn-Teller Effect as a Possible Route to Antiferroelectricity
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GEIRHOS, Korbinian, LANGMANN, Jan, PRODAN, Lilian, TSIRLIN, Alexander A., MISSIUL, A., EICKERLING, Georg, JESCHE, Anton, TSURKAN, Vladimir, LUNKENHEIMER, Peter, SCHERER, Wolfgang, KEZSMARKI, Istvan. Cooperative Cluster Jahn-Teller Effect as a Possible Route to Antiferroelectricity. In: Physical Review Letters, 2021, nr. 18(126), p. 0. ISSN 0031-9007. DOI: https://doi.org/10.1103/PhysRevLett.126.187601
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Physical Review Letters
Numărul 18(126) / 2021 / ISSN 0031-9007

Cooperative Cluster Jahn-Teller Effect as a Possible Route to Antiferroelectricity

DOI: https://doi.org/10.1103/PhysRevLett.126.187601

Pag. 0-0

Geirhos Korbinian1, Langmann Jan1, Prodan Lilian12, Tsirlin Alexander A.1, Missiul A.3, Eickerling Georg1, Jesche Anton1, Tsurkan Vladimir12, Lunkenheimer Peter1, Scherer Wolfgang1, Kezsmarki Istvan1
 
1 University of Augsburg,
2 Institute of Applied Physics,
3 CELLS-ALBA Synchrotron Light Source
 
Disponibil în IBN: 22 mai 2021


Rezumat

We report the observation of an antipolar phase in cubic GaNb4S8 driven by an unconventional microscopic mechanism, the cooperative Jahn-Teller effect of Nb4S4 molecular clusters. The assignment of the antipolar nature is based on sudden changes in the crystal structure and a strong drop of the dielectric constant at TJT=31 K, also indicating the first-order nature of the transition. In addition, we found that local symmetry lowering precedes long-range orbital ordering, implying the presence of a dynamic Jahn-Teller effect in the cubic phase above TJT. Based on the variety of structural polymorphs reported in lacunar spinels, also including ferroelectric phases, we argue that GaNb4S8 may be transformable to a ferroelectric state, which would further classify the observed antipolar phase as antiferroelectric.

Cuvinte-cheie
Antiferroelectricity, crystal structure, Ferroelectricity, Gallium compounds, Jahn-, Teller effect, Niobium compounds