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Title: Traces of charge density waves in NbS 2

Abstract

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 3q–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.

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:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
Universities/Institutions; USDOE
OSTI Identifier:
1440495
Report Number(s):
LA-UR-18-20468
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1900755
Grant/Contract Number:  
AC52-06NA25396
Resource 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)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Material Science

Citation Formats

Leroux, Maxime, Cario, Laurent, Bosak, Alexei, and Rodiere, Pierre. Traces of charge density waves in NbS2. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.97.195140.
Leroux, Maxime, Cario, Laurent, Bosak, Alexei, & Rodiere, Pierre. Traces of charge density waves in NbS2. United States. https://doi.org/10.1103/PhysRevB.97.195140
Leroux, Maxime, Cario, Laurent, Bosak, Alexei, and Rodiere, Pierre. Tue . "Traces of charge density waves in NbS2". United States. https://doi.org/10.1103/PhysRevB.97.195140. https://www.osti.gov/servlets/purl/1440495.
@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 = {Tue May 15 00:00:00 EDT 2018},
month = {Tue May 15 00:00:00 EDT 2018}
}

Journal Article:
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Cited by: 27 works
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Figures / Tables:

FIG. 1 FIG. 1: Cristallographic structures of the three known polytypes of NbS2: 1T reported only in thin film7 or monolayer form8, and 2H and 3R found in bulk crystals form9. In the 1T polytype, the transition metal atom is in octahedral coordination and layers are stacked without rotation or in-plane translation.more » The 2H and 3R polytypes are composed of 1H single layers with the metal atom in trigonal prismatic coordination, but they differ by their stacking: rotation and no in-plane translation for 2H, in-plane translation and no rotation for 3R. The unit cell is indicated by solid red lines.« less

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Works referencing / citing this record:

Optical Properties of 2D 3R Phase Niobium Disulfide and Its Applications as a Saturable Absorber
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Niobium disulphide (NbS 2 )-based (heterogeneous) electrocatalysts for an efficient hydrogen evolution reaction
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Coexistence of the Kondo effect and spin glass physics in Fe-doped NbS 2
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Impact ionization dynamics in small band-gap two-dimensional materials from a coherent phonon mechanism
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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.