Journal
PHYSICAL REVIEW B
Volume 100, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.100.075428
Keywords
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Funding
- U.S. Department of Energy, Office of Basic Energy Sciences, Materials Science Division [DE-FG02-01ER45885]
- National Science Foundation DMREF Grant [DMR-1629059]
- Gordon and Betty Moore Foundations EPiQS Initiative [GBMF4416]
- Center for Materials Processing, a Tennessee Higher Education Commission (THEC)
- DOE Office of Science User Facility [DE-AC02-05CH11231]
- remote user program from NSLS-II [DE-SC0012704]
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We measured the near-field infrared response of MnPS3 in bulk, few-, and single-layer form and compared our findings with traditional far-field vibrational spectroscopies, a symmetry analysis, and first-principles lattice dynamics calculations. Trends in the B-u mode near 450 cm(-1) are striking, with the disappearance of this structure in the thinnest sheets. Combined with the amplified response of the activated A(g) mode and analysis of the A(u) + B-u features, we find that symmetry is unexpectedly increased in few- and single-sheet MnPS3 due to a restoration of the threefold axes of rotation. Monoclinicity in this system is therefore a consequence of the long-range stacking pattern and temperature rather than local structure.
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