S-Shaped Suppression of the Superconducting Transition Temperature in Cu-Intercalated NbSe2

Huixia Luo, Judyta Strychalska-Nowak, Jun Li, Jing Tao, Tomasz Klimczuk, Robert J. Cava

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35 Scopus citations


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. Here 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.

Original languageEnglish (US)
Pages (from-to)3704-3712
Number of pages9
JournalChemistry of Materials
Issue number8
StatePublished - Apr 25 2017

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Chemical Engineering
  • Materials Chemistry


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