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

Journal Article · · Chemistry of Materials
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

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.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704; FG02-98ER45706
OSTI ID:
1412646
Report Number(s):
BNL-114323-2017-JA; R&D Project: MA015MACA; KC0201010; TRN: US1800315
Journal Information:
Chemistry of Materials, Vol. 29, Issue 8; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 30 works
Citation information provided by
Web of Science

References (41)

The structure of the incommensurate superlattices of 2H–TaSe 2 journal April 1981
Visualizing the charge density wave transition in 2 H - NbSe 2 in real space journal June 2014
Quantum phase transition from triangular to stripe charge order in NbSe2 journal January 2013
Superconductivity journal January 1963
Layer structure superconductor journal August 1963
Charge-Density Waves in Metallic, Layered, Transition-Metal Dichalcogenides journal April 1974
Heat Conduction in the Vortex State of N b S e 2 : Evidence for Multiband Superconductivity journal March 2003
Pressure Induced Effects on the Fermi Surface of Superconducting 2 H NbSe 2 journal September 2005
X-ray scattering studies of 2 H -NbSe 2 , a superconductor and charge density wave material, under high external magnetic fields journal June 2000
Strongly enhanced charge-density-wave order in monolayer NbSe2 journal July 2015
Coherent long-range magnetic bound states in a superconductor journal October 2015
Fermi-surface nesting and the origin of the charge-density wave in Nb Se 2 journal May 2006
Quantum oscillations in the mixed state of the type II superconductor 2H-NbSe 2 journal June 1994
d-Wave pairing symmetry in cuprate superconductors—fundamental implications and potential applications journal February 2002
The origin of multiple superconducting gaps in MgB2 journal May 2003
Modeling MgB2 two-gap superconductivity journal April 2002
MgB 2 two-gap superconductivity with intra- and interband couplings journal January 2003
Experimental evidence for a two-gap structure of superconducting Nb Se 2 : A specific-heat study in external magnetic fields journal December 2007
Experimental evidence for a two-band superconducting state of NbSe 2 single crystals journal July 2010
Penetration Depth Study of Superconducting Gap Structure of 2 H NbSe 2 journal February 2007
STM study of multiband superconductivity in NbSe2 using a superconducting tip journal May 2004
Intrinsic atomic-scale modulations of the superconducting gap of 2 H NbSe 2 journal April 2008
Signatures of multigap superconductivity in tunneling spectroscopy journal July 2010
Gaps and kinks in the electronic structure of the superconductor 2 H -NbSe 2 from angle-resolved photoemission at 1 K journal June 2012
Fermi Surface Sheet-Dependent Superconductivity in 2H-NbSe2 journal December 2001
Charge-density-wave mechanism in the 2 H NbSe 2 family: Angle-resolved photoemission studies journal May 2001
Ising pairing in superconducting NbSe2 atomic layers journal November 2015
Photoemission studies of Cu intercalated NbSe2 journal May 2011
Intercalation of the niobium-diselenide layer structure by first-row transition metals journal January 1970
Transition Temperature of Strong-Coupled Superconductors journal March 1968
Infrared properties of the semimetal Ti Se 2 journal September 1978
Excitonic Phases journal August 1967
Temperature and Purity Dependence of the Superconducting Critical Field, H c 2 . III. Electron Spin and Spin-Orbit Effects journal July 1966
Differences in Chemical Doping Matter: Superconductivity in Ti 1– x Ta x Se 2 but Not in Ti 1– x Nb x Se 2 journal February 2016
Superconductivity in CaBi 2 journal January 2016
Upper critical field, lower critical field and critical current density of FeTe 0.60 Se 0.40 single crystals journal October 2009
Charge-order-maximized momentum-dependent superconductivity journal August 2007
Charge density wave and superconductivity in 2H- and 4H-NbSe2: A revisit journal June 2011
Characterization of collective ground states in single-layer NbSe2 journal November 2015
Effect of 3 d Impurities on the Superconducting Transition Temperature of the Layered Compound Nb Se 2 journal August 1973
Stoichiometry, structure, and physical properties of niobium disulfide journal January 1980

Cited By (8)

NbSeTe—a new layered transition metal dichalcogenide superconductor journal October 2019
Coexistence of superconductivity and ferromagnetism in defect-induced NbSe2 single crystals journal June 2019
Ion intercalation engineering of electronic properties of two-dimensional crystals of 2 H TaSe 2 journal October 2019
Study of transport properties in Se-deficient and Fe-intercalated NbSe2 single crystals: experiment and theory journal September 2019
Enhancement of superconducting properties and flux pinning mechanism on Cr0.0005NbSe2 single crystal under Hydrostatic pressure journal January 2019
Unconventional scaling of the superfluid density with the critical temperature in transition metal dichalcogenides journal November 2019
Unconventional scaling of the superfluid density with the critical temperature in transition metal dichalcogenides text January 2019
NbSeTe -A New Layered Transition Metal Dichalcogenide Superconductor text January 2019