Traces of charge density waves in
- Univ. Grenoble Alpes, Grenoble (France); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Institut des Materiaux de Nantes, Nantes (France)
- The European Synchrotron, Grenoble (France)
- Univ. Grenoble Alpes, Grenoble (France)
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.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- Universities/Institutions; USDOE
- Grant/Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1440495
- Report Number(s):
- LA-UR-18-20468; PRBMDO; TRN: US1900755
- Journal Information:
- Physical Review B, Vol. 97, Issue 19; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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