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Title: Phonon anomalies in FeS

Journal Article · · Physical Review B
 [1];  [2];  [2];  [3];  [4];  [1];  [5];  [2];  [2];  [6];  [5];  [7];  [7];  [8];  [5]
  1. Walther Meissner Institut, Bayerische Akademie der Wissenschaften, Garching (Germany); Technische Universität München, Garching (Germany). Fakultät für Physik
  2. University of Belgrade (Serbia). Center for Solid State Physics and New Materials, Institute of Physics Belgrade
  3. University of Belgrade (Serbia). Scientific Computing Laboratory, Center for the Study of Complex Systems, Institute of Physics Belgrade
  4. University of Belgrade (Serbia). Faculty of Physics
  5. Walther Meissner Institut, Bayerische Akademie der Wissenschaften, Garching (Germany)
  6. University of Belgrade (Serbia). Center for Solid State Physics and New Materials, Institute of Physics Belgrade; University of Wisconsin, Oshkosh, WI (United States)
  7. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Department
  8. University of Belgrade (Serbia). Center for Solid State Physics and New Materials, Institute of Physics Belgrade; Serbian Academy of Sciences and Arts, Belgrade (Serbia)

Here, we present results from light scattering experiments on tetragonal FeS with the focus placed on lattice dynamics. We identify the Raman active A1g and B1g 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. Additionally, 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.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704
OSTI ID:
1430875
Alternate ID(s):
OSTI ID: 1420200
Report Number(s):
BNL-203431-2018-JAAM; PRBMDO; TRN: US1802628
Journal Information:
Physical Review B, Vol. 97, Issue 5; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 17 works
Citation information provided by
Web of Science

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Cited By (2)

Temperature-Dependent Raman Study of Nanostructured and Multifunctional Materials journal March 2019
Photoinduced semiconductor-metal transition in ultrathin troilite FeS nanosheets to trigger efficient hydrogen evolution journal January 2019

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