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Article Dans Une Revue Physical Review Letters Année : 2019

Pressure-Induced Collapse of the Charge Density Wave and Higgs Mode Visibility in 2H−TaS2

Résumé

The pressure evolution of the Raman active electronic excitations of the transition metal dichalcogenides 2H−TaS2 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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Dates et versions

hal-02415784 , version 1 (24-08-2023)

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Romain Grasset, Yann Gallais, Alain Sacuto, Maximilien Cazayous, Samuel Mañas-Valero, et al.. Pressure-Induced Collapse of the Charge Density Wave and Higgs Mode Visibility in 2H−TaS2. Physical Review Letters, 2019, 122 (12), pp.127001. ⟨10.1103/PhysRevLett.122.127001⟩. ⟨hal-02415784⟩
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