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

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

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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 Perfil; Méasson, Marie-Aude
This document is a artículoDate2019
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.

    Grasset, Romain Gallais, Yann Sacuto, Alain Cazayous, Maximilien Mañas Valero, Samuel Coronado Miralles, Eugenio Méasson, Marie-Aude 2019 Pressure-Induced Collapse of the Charge Density Wave and Higgs Mode Visibility in 2H−TaS2 Physical Review Letters 122 127001-1 127001-6
https://doi.org/10.1103/PhysRevLett.122.127001

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