Journal
PHYSICAL REVIEW B
Volume 97, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.97.094502
Keywords
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Funding
- Labex SEAM [ANR-11-IDEX-0005-02]
- French Agence Nationale de la Recherche (ANR PRINCESS) [ANR-11-BS04-002]
- French Agence Nationale de la Recherche (ANR SEO-HiggS2) [ANR-16-CE30-0014]
- Italian MIUR [PRINRIDEIRON-2012X3YFZ2]
- Italian MAECI under the Italia-India collaborative project SuperTop [PGR04879]
- Graphene Flagship
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Despite being usually considered two competing phenomena, charge-density wave and superconductivity coexist in few systems, the most emblematic one being the transition-metal dichalcogenide 2H-NbSe2. This unusual condition is responsible for specific Raman signatures across the two phase transitions in this compound. While the appearance of a soft phonon mode is a well-established fingerprint of the charge-density-wave order, the nature of the sharp subgap mode emerging below the superconducting temperature is still under debate. In this work we use external pressure as a knob to unveil the delicate interplay between the two orders, and consequently the nature of the superconducting mode. Thanks to an advanced extreme-conditions Raman technique, we are able to follow the pressure evolution and the simultaneous collapse of the two intertwined charge-density-wave and superconducting modes. The comparison with microscopic calculations in a model system supports the Higgs-type nature of the superconducting mode and suggests that charge-density wave and superconductivity in 2H-NbSe2 involve mutual electronic degrees of freedom. These findings fill the knowledge gap on the electronic mechanisms at play in transition-metal dichalcogenides, a crucial step to fully exploit their properties in few-layer systems optimized for device applications.
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