In:
npj 2D Materials and Applications, Springer Science and Business Media LLC, Vol. 6, No. 1 ( 2022-06-09)
Kurzfassung:
van der Waals solids are ideal platforms for the discovery of new states of matter and emergent properties under external stimuli. Under pressure, complex chalcogenides like M PS 3 ( M = Mn, Ni, Co, V) host sliding and structural transitions, insulator-to-metal transitions, the possibility of an orbitally-selective Mott state, piezochromism, and superconductivity. In this work, we bring together diamond anvil cell techniques, infrared and Raman scattering spectroscopies, and X-ray diffraction with a detailed symmetry analysis and first-principles calculations to uncover a series of high-pressure phases in NiPS 3 . Remarkably, we find five different states of matter between ambient conditions and 39 GPa—quite different than in the other M PS 3 materials. Even more strikingly, infrared spectroscopy and X-ray diffraction combined with a symmetry analysis reveal both metallicity and loss of the inversion center above ~23 GPa suggesting that NiPS 3 may be a polar metal with a P 3 m 1 space group under these conditions and P 1 symmetry under maximum compression. In addition to identifying a candidate polar metal ripe for further inquiry, we suggest that pressure may tune other complex chalcogenides into this elusive state.
Materialart:
Online-Ressource
ISSN:
2397-7132
DOI:
10.1038/s41699-022-00313-9
Sprache:
Englisch
Verlag:
Springer Science and Business Media LLC
Publikationsdatum:
2022
ZDB Id:
2893016-2
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