Pressure-Induced Collapse of the Charge Density Wave and Higgs Mode Visibility in 2H−TaS2
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Grasset, Romain; Gallais, Yann; Sacuto, Alain; Cazayous, Maximilien; Mañas Valero, Samuel; Coronado Miralles, Eugenio; Méasson, Marie-Aude
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Aquest document és un/a article, creat/da en: 2019
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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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