Charge Density Wave and Narrow Energy Gap at Room Temperature in 2D Pb3–xSb1+xS4Te2-δ with Square Te Sheets
Journal Article
·
· Journal of the American Chemical Society
- Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry; Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
- Univ. of Illinois, Urbana-Champaign, IL (United States). Dept. of Physics
- Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
We report a new two-dimensional compound Pb3–xSb1+xS4Te2-δ has a charge density wave (CDW) at room temperature. The CDW is incommensurate with q-vector of 0.248(6)a* + 0.246(8)b* + 0.387(9)c* for x = 0.29(2) and d = 0.37(3) due to positional and occupational long range ordering of Te atoms in the sheets. The modulated structure was refined from the single crystal X-ray diffraction data with a superspace group P$$\bar{1}$$(αβγ)0 using (3 + 1)-dimensional crystallography. The resistivity increases with decreasing temperature, suggesting semiconducting behavior. The transition temperature (TCDW) of the CDW is ~ 345 K above which the Te square sheets become disordered with no q-vector. Lastly, first-principles density functional theory calculations on the undistorted structure and an approximate commensurate supercell reveal that the gap is due to the structure modulation.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (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) (SC-22)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1393841
- Journal Information:
- Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 32 Vol. 139; ISSN 0002-7863
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
NpSe 2 : a Binary Chalcogenide Containing Modulated Selenide Chains and Ambiguous‐Valent Metal
|
journal | September 2019 |
NpSe 2 : a Binary Chalcogenide Containing Modulated Selenide Chains and Ambiguous‐Valent Metal
|
journal | November 2019 |
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OSTI ID:6265493