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Title: S-Shaped Suppression of the Superconducting Transition Temperature in Cu-Intercalated NbSe 2

2H-NbSe 2 is the prototype and most frequently studied of the well-known transition metal dichalcogenide (TMDC) superconductors. As 2H-NbSe 2 is widely acknowledged as a conventional superconductor, its transition temperature to the superconducting state (T c) is 7.3 K, a T c that is substantially higher than those seen for the majority of TMDCs, where Tc values between 2 and 4 K are the norm. We report the intercalation of Cu into 2H-NbSe 2 to make Cu xNbSe 2. As is typically found when chemically altering an optimal superconductor, T c decreases with an increase in x, but the way that Tc is suppressed in this case is unusual: an S-shaped character is observed, with an inflection point near x = 0.03 and, at higher x values, a leveling off of the T c near 3 K, down to the usual value for a layered TMDC. Electronic characterization reveals corresponding S-like behavior for many of the parameters of the materials that influence T c. In order to illustrate its character, the superconducting phase diagram for Cu xNbSe 2 is contrasted with those of FexNbSe 2 and NbSe 2–xS x.
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [3] ;  [2] ;  [4]
  1. Princeton Univ., NJ (United States). Dept. of Chemistry; Sun Yat-Sen Univ., Guangzhou, (China). School of Materials Science and Engineering
  2. Gdansk Univ. of Technology (Poland). Faculty of Applied Physics and Mathematics
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
  4. Princeton Univ., NJ (United States). Dept. of Chemistry
Publication Date:
Report Number(s):
BNL-114323-2017-JA
Journal ID: ISSN 0897-4756; R&D Project: MA015MACA; KC0201010; TRN: US1800315
Grant/Contract Number:
SC0012704; FG02-98ER45706
Type:
Accepted Manuscript
Journal Name:
Chemistry of Materials
Additional Journal Information:
Journal Volume: 29; Journal Issue: 8; Journal ID: ISSN 0897-4756
Publisher:
American Chemical Society (ACS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1412646