期刊
PHYSICAL REVIEW LETTERS
卷 122, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.122.127001
关键词
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资金
- 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]
- European Research Council [788222]
- Spanish MINECO (Excellence Unit Mara de Maeztu) [MDM-2015-0538]
- Generalitat Valenciana [PROMETEO/2017/066]
- Spanish MECD [FPU014/04407]
The pressure evolution of the Raman active electronic excitations of the transition metal dichalcogenides 2H-Ta-2 is followed through the pressure phase diagram embedding incommensurate charge-density-wave and superconducting states. At high pressure, the charge-density wave is found to collapse at 8.5 GPa. In the coexisting charge-density-wave and superconducting orders, we unravel a strong in-gap superconducting mode, attributed to a Higgs mode, coexisting with the expected incoherent Cooper-pair breaking signature. The latter remains in the pure superconducting state reached above 8.5 GPa. Our report constitutes a new observation of such Raman active Higgs mode since the long-standing unique case 2H-NbSe2.
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