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

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 Tc 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 Tc. 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 Tc 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 Tc/TF 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.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [2]; ORCiD logo [1];  [2];  [2]; ORCiD logo [1];  [2]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [2];  [2]; ORCiD logo [4]; ORCiD logo [5]
  1. Univ. of Zurich (Switzerland)
  2. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  3. Princeton Univ., NJ (United States)
  4. Columbia Univ., New York, NY (United States)
  5. Paul Scherrer Inst. (PSI), Villigen (Switzerland); Princeton Univ., NJ (United States)
Publication Date:
Research Org.:
Princeton Univ., NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
Contributing Org.:
Swiss National Science Foundation
OSTI Identifier:
1626010
Grant/Contract Number:  
FG02-05ER46200; 200021_149486; 200021_175935; PZ00P2_174015; DMR-1436095; DMR-1610633; 701647; P300P2-177832
Resource Type:
Accepted Manuscript
Journal Name:
Science Advances
Additional Journal Information:
Journal Volume: 5; Journal Issue: 11; Journal ID: ISSN 2375-2548
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Science & Technology - Other Topics

Citation Formats

von Rohr, F. O., Orain, J. -C., Khasanov, R., Witteveen, C., Shermadini, Z., Nikitin, A., Chang, J., Wieteska, A. R., Pasupathy, A. N., Hasan, M. Z., Amato, A., Luetkens, H., Uemura, Y. J., and Guguchia, Z.. Unconventional scaling of the superfluid density with the critical temperature in transition metal dichalcogenides. United States: N. p., 2019. Web. https://doi.org/10.1126/sciadv.aav8465.
von Rohr, F. O., Orain, J. -C., Khasanov, R., Witteveen, C., Shermadini, Z., Nikitin, A., Chang, J., Wieteska, A. R., Pasupathy, A. N., Hasan, M. Z., Amato, A., Luetkens, H., Uemura, Y. J., & Guguchia, Z.. Unconventional scaling of the superfluid density with the critical temperature in transition metal dichalcogenides. United States. https://doi.org/10.1126/sciadv.aav8465
von Rohr, F. O., Orain, J. -C., Khasanov, R., Witteveen, C., Shermadini, Z., Nikitin, A., Chang, J., Wieteska, A. R., Pasupathy, A. N., Hasan, M. Z., Amato, A., Luetkens, H., Uemura, Y. J., and Guguchia, Z.. Fri . "Unconventional scaling of the superfluid density with the critical temperature in transition metal dichalcogenides". United States. https://doi.org/10.1126/sciadv.aav8465. https://www.osti.gov/servlets/purl/1626010.
@article{osti_1626010,
title = {Unconventional scaling of the superfluid density with the critical temperature in transition metal dichalcogenides},
author = {von Rohr, F. O. and Orain, J. -C. and Khasanov, R. and Witteveen, C. and Shermadini, Z. and Nikitin, A. and Chang, J. and Wieteska, A. R. and Pasupathy, A. N. and Hasan, M. Z. and Amato, A. and Luetkens, H. and Uemura, Y. J. and Guguchia, Z.},
abstractNote = {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 Tc 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 Tc. 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 Tc 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 Tc/TF 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.},
doi = {10.1126/sciadv.aav8465},
journal = {Science Advances},
number = 11,
volume = 5,
place = {United States},
year = {2019},
month = {11}
}

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Figures / Tables:

Fig. 1 Fig. 1: Schematic phase diagram and TF μSR time spectra for NbSe2. (A) Crystal structure of 2H-NbSe2. (B) Pressure dependence of Tc and the CDW temperature TCDW (5). The red arrows mark the pressures at which the T dependence of the penetration depth was measured. The TF spectra, above andmore » below Tc at pressures of (C) p = 0 GPa and (D) p = 2.2 GPa, are shown. The solid lines in (C) and (D) represent fits to the data by means of Eq. 4. The dashed lines are guides to the eyes.« less

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      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.