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강상관계 물질 연구단
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Electronic and vibrational properties of the two-dimensional Mott insulator V0.9PS3 under pressure

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Title
Electronic and vibrational properties of the two-dimensional Mott insulator V0.9PS3 under pressure
Author(s)
Matthew John Coak; Yong-Hyun Kim; Yoo Soo Yi; Suhan Son; Sung Keun Lee; Je-Geun Park
Publication Date
2019-07
Journal
PHYSICAL REVIEW B, v.100, no.3, pp.035120 -
Publisher
AMER PHYSICAL SOC
Abstract
We present a Raman spectroscopic study of the layered antiferromagnetic Mott insulator V(0.9)PS(3 )and demonstrate the evolution of the spectra with applied quasihydrostatic pressure. Clear features in the spectra are seen at the pressures identified as corresponding to a structural transition between 20 and 80 kbar and the insulator-metal transition at 120 kbar. The feature at 120 kbar can be understood as a stiffening of interplanar vibrations, linking the metallization to a crossover from two- to three-dimensionality. Theoretical ab initio calculations, using the previously determined high-pressure structures, were able to reproduce the measured spectra and map each peak to specific vibration modes. We additionally show calculations of the high-pressure band structure in these materials, where the opening of a band gap with an included Hubbard U term and its subsequent closing with pressure are clearly demonstrated. This little-studied material shows great promise as a model system for the fundamental study of low-dimensional magnetism and Mott physics. ©2019 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/6525
ISSN
2469-9950
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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