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Unconventional scaling of the superfluid density with the critical temperature in transition metal dichalcogenides.

  • Author(s): von Rohr, FO;
  • Orain, J-C;
  • Khasanov, R;
  • Witteveen, C;
  • Shermadini, Z;
  • Nikitin, A;
  • Chang, J;
  • Wieteska, AR;
  • Pasupathy, AN;
  • Hasan, MZ;
  • Amato, A;
  • Luetkens, H;
  • Uemura, YJ;
  • Guguchia, Z
  • et al.
Abstract

We report on muon spin rotation experiments probing the magnetic penetration depth λ(T) in the layered superconductors in 2H-NbSe2 and 4H-NbSe2. The current results, along with our earlier findings on 1T'-MoTe2 (Guguchia et al.), demonstrate that the superfluid density scales linearly with T c in the three transition metal dichalcogenide superconductors. Upon increasing pressure, we observe a substantial increase of the superfluid density in 2H-NbSe2, which we find to correlate with T c. The correlation deviates from the abovementioned linear trend. A similar deviation from the Uemura line was also observed in previous pressure studies of optimally doped cuprates. This correlation between the superfluid density and T c is considered a hallmark feature of unconventional superconductivity. Here, we show that this correlation is an intrinsic property of the superconductivity in transition metal dichalcogenides, whereas the ratio T c/T F is approximately a factor of 20 lower than the ratio observed in hole-doped cuprates. We, furthermore, find that the values of the superconducting gaps are insensitive to the suppression of the charge density wave state.

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