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Title: Traces of charge density waves in NbS 2

Among transition metal dichalcogenides (TMD), NbS 2 is often considered as the archetypal compound that does not have a charge density wave (CDW) in any of its polytypes. By comparison, close isoelectronic compounds such as NbSe 2, TaS 2, and TaSe 2 all have CDW in at least one polytype. Here we report traces of CDW in the 2H polytype of NbS 2, using diffuse x-ray scattering measurements at 77 K and room temperature. We observe 12 extremely weak satellite peaks located at ±13.9° from a* and b* around each Bragg peak in the (h,k,0) plane. These satellite peaks are commensurate with the lattice via 3 q– q'= a*, where q' is the 120° rotation of q, and define two √13a × √13a superlattices in real space. These commensurate wave vectors and tilt angle are identical to those of the CDW observed in the 1T polytype of TaS 2 and TaSe 2. In conclusion, to understand this similarity and the faintness of the peaks, we discuss possible sources of local 1T polytype environment in bulk 2H-NbS 2 crystals.
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [4]
  1. Univ. Grenoble Alpes, Grenoble (France); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Institut des Materiaux de Nantes, Nantes (France)
  3. The European Synchrotron, Grenoble (France)
  4. Univ. Grenoble Alpes, Grenoble (France)
Publication Date:
Report Number(s):
LA-UR-18-20468
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 19; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
Universities/Institutions; USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Material Science
OSTI Identifier:
1440495

Leroux, Maxime, Cario, Laurent, Bosak, Alexei, and Rodiere, Pierre. Traces of charge density waves in NbS2. United States: N. p., Web. doi:10.1103/PhysRevB.97.195140.
Leroux, Maxime, Cario, Laurent, Bosak, Alexei, & Rodiere, Pierre. Traces of charge density waves in NbS2. United States. doi:10.1103/PhysRevB.97.195140.
Leroux, Maxime, Cario, Laurent, Bosak, Alexei, and Rodiere, Pierre. 2018. "Traces of charge density waves in NbS2". United States. doi:10.1103/PhysRevB.97.195140.
@article{osti_1440495,
title = {Traces of charge density waves in NbS2},
author = {Leroux, Maxime and Cario, Laurent and Bosak, Alexei and Rodiere, Pierre},
abstractNote = {Among transition metal dichalcogenides (TMD), NbS2 is often considered as the archetypal compound that does not have a charge density wave (CDW) in any of its polytypes. By comparison, close isoelectronic compounds such as NbSe2, TaS2, and TaSe2 all have CDW in at least one polytype. Here we report traces of CDW in the 2H polytype of NbS2, using diffuse x-ray scattering measurements at 77 K and room temperature. We observe 12 extremely weak satellite peaks located at ±13.9° from →a* and →b* around each Bragg peak in the (h,k,0) plane. These satellite peaks are commensurate with the lattice via 3→q–→q'=→a*, where →q' is the 120° rotation of →q, and define two √13a × √13a superlattices in real space. These commensurate wave vectors and tilt angle are identical to those of the CDW observed in the 1T polytype of TaS2 and TaSe2. In conclusion, to understand this similarity and the faintness of the peaks, we discuss possible sources of local 1T polytype environment in bulk 2H-NbS2 crystals.},
doi = {10.1103/PhysRevB.97.195140},
journal = {Physical Review B},
number = 19,
volume = 97,
place = {United States},
year = {2018},
month = {5}
}

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