• Home
  1. Home
  2. Unconventional scaling of the superfluid density with the critical temperature in transition metal dichalcogenides
Scientific article
OA Policy
English

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

Contributors

von Rohr, Fabian; Orain, J.-C.; Khasanov, R.; Witteveen, Catherine; Shermadini, Z.; Nikitin, A.; Chang, J.; Wieteska, A. R.; Pasupathy, A. N.; Hasan, M. Z.; Amato, A.; Luetkens, H.; Uemura, Y. J.; Guguchia, Z.

Published in

Science advances, vol. 5, no. 11, eaav8465

Publication date

2019-11

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.

UNIGE affiliation entities

Not a UNIGE publication

UNIGE research groups

Funding

Citation (ISO format)

VON ROHR, Fabian et al. Unconventional scaling of the superfluid density with the critical temperature in transition metal dichalcogenides. In: Science advances, 2019, vol. 5, n° 11, p. eaav8465. doi: 10.1126/sciadv.aav8465

Main files (1)

Article (Published version)
CC BY-NC-4.0

Identifiers

Additional URL for this publication

https://www.science.org/doi/10.1126/sciadv.aav8465

Journal ISSN

2375-2548
187views
559downloads

Technical informations

Creation

12/07/2022 12:25:00

First validation

12/07/2022 12:25:00

Update

16/03/2023 07:02:31

Status update

16/03/2023 07:02:29

Last indexation

01/11/2024 02:17:30
All rights reserved by Archive ouverte UNIGE and the University of Geneva
OpenAIRE Indexed & Validated