期刊
PHYSICAL REVIEW B
卷 97, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.97.054306
关键词
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资金
- German Research Foundation (DFG) [SPP 1458, Ha2071/7]
- Serbian Ministry of Education, Science and Technological Development [III45018, ON171017]
- DAAD [56267076, 57142964]
- Center for Emergent Superconductivity, an Energy Frontier Research Center - U.S. DOE, Office of Basic Energy Sciences
- UW Oshkosh [FDS498]
We present results from light scattering experiments on tetragonal FeS with the focus placed on lattice dynamics. We identify the Raman active A(1g) and B-1g phonon modes, a second order scattering process involving two acoustic phonons, and contributions from potentially defect-induced scattering. The temperature dependence between 300 and 20 K of all observed phonon energies is governed by the lattice contraction. Below 20 K the phonon energies increase by 0.5-1 cm(-1), thus indicating putative short range magnetic order. Along with the experiments we performed lattice-dynamical simulations and a symmetry analysis for the phonons and potential overtones and find good agreement with the experiments. In particular, we argue that the two-phonon excitation observed in a gap between the optical branches becomes observable due to significant electron-phonon interaction.
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