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SM ISO690:2012 WANG, Yuejian, RAHMAN, Saqib, SUN, Elaine, KNILL, Christopher, ZHANG, Dongzhou Zhou, WANG, Lin, TSURKAN, Vladimir, KEZSMARKI, Istvan. From semiconducting to metallic: Jahn−Teller-induced phase transformation in skyrmion host Gav4S8. In: Journal of Physical Chemistry C, 2021, vol. 125, pp. 5771-5780. ISSN 1932-7447. DOI: https://doi.org/10.1021/acs.jpcc.0c10527 |
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Journal of Physical Chemistry C | |
Volumul 125 / 2021 / ISSN 1932-7447 /ISSNe 1932-7455 | |
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DOI:https://doi.org/10.1021/acs.jpcc.0c10527 | |
Pag. 5771-5780 | |
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Rezumat | |
Lacunar spinels, GaM4X8 (M = V, Nb, Mo, Ta, W; X = S, Se, Te), constitute a rare class of compounds with multiferroic properties. Recently, one member of this family, GaV4S8, received global attention due to the Neél-type skyrmions discovered in this material. Previous investigations strongly indicate the important role of the structure behind the multiferroicity, for example, the strong impact of ferroelectric transition on the exchange interactions at ∼40 K. Inspired by the delicate entanglement of lattice, spin, and charge degrees of freedom, in the present work, we aimed to use pressure to alter the structure and thus change the material's properties to establish the inter-relation between the structural, optical, and electrical properties for a better understanding of this skyrmion host material. Upon this objective, in situ high-pressure measurements of single crystal/powder X-ray diffraction, electrical conductivity, and Raman spectroscopy were carried out by using a diamond anvil cell. These studies revealed the pressure-induced structural transformation from cubic to orthorhombic, along with a transition from semiconductor to metallic state in GaV4S8. The phase changes coincide with the variation in the optical property in this material explored by Raman spectra. We also determined the bulk modulus of the two phases of GaV4S8 by fitting the data set of unit cell volumes against pressure with the second-order birth-Murnaghan equation of state, and explained the mechanisms of phase transitions by means of the Jahn−Teller effect and the anisotropic changes in bonding lengths during compression. |
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Cuvinte-cheie Degrees of freedom (mechanics), Equations of state, Gallium compounds, Jahn-Teller effect, multiferroics, Optical lattices, optical properties, single crystals, structural properties, Sulfur compounds |
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