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

Abstract

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:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1412646
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
Resource Type:
Journal Article: 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)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Luo, Huixia, Strychalska-Nowak, Judyta, Li, Jun, Tao, Jing, Klimczuk, Tomasz, and Cava, Robert J. S-Shaped Suppression of the Superconducting Transition Temperature in Cu-Intercalated NbSe 2. United States: N. p., 2017. Web. doi:10.1021/acs.chemmater.7b00655.
Luo, Huixia, Strychalska-Nowak, Judyta, Li, Jun, Tao, Jing, Klimczuk, Tomasz, & Cava, Robert J. S-Shaped Suppression of the Superconducting Transition Temperature in Cu-Intercalated NbSe 2. United States. doi:10.1021/acs.chemmater.7b00655.
Luo, Huixia, Strychalska-Nowak, Judyta, Li, Jun, Tao, Jing, Klimczuk, Tomasz, and Cava, Robert J. Tue . "S-Shaped Suppression of the Superconducting Transition Temperature in Cu-Intercalated NbSe 2". United States. doi:10.1021/acs.chemmater.7b00655. https://www.osti.gov/servlets/purl/1412646.
@article{osti_1412646,
title = {S-Shaped Suppression of the Superconducting Transition Temperature in Cu-Intercalated NbSe 2},
author = {Luo, Huixia and Strychalska-Nowak, Judyta and Li, Jun and Tao, Jing and Klimczuk, Tomasz and Cava, Robert J.},
abstractNote = {2H-NbSe2 is the prototype and most frequently studied of the well-known transition metal dichalcogenide (TMDC) superconductors. As 2H-NbSe2 is widely acknowledged as a conventional superconductor, its transition temperature to the superconducting state (Tc) is 7.3 K, a Tc 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-NbSe2 to make CuxNbSe2. As is typically found when chemically altering an optimal superconductor, Tc 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 Tc 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 Tc. In order to illustrate its character, the superconducting phase diagram for CuxNbSe2 is contrasted with those of FexNbSe2 and NbSe2–xSx.},
doi = {10.1021/acs.chemmater.7b00655},
journal = {Chemistry of Materials},
number = 8,
volume = 29,
place = {United States},
year = {Tue Mar 21 00:00:00 EDT 2017},
month = {Tue Mar 21 00:00:00 EDT 2017}
}

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