6533b854fe1ef96bd12ae1e4
RESEARCH PRODUCT
Pressure induced collapse of the charge density wave and Higgs mode visibility in 2H-TaS$_2$
Romain GrassetYann GallaisAlain SacutoMaximilien CazayousSamuel Ma��as-valeroEugenio CoronadoMarie-aude M��assonsubject
Superconductivity (cond-mat.supr-con)Condensed Matter - Strongly Correlated ElectronsStrongly Correlated Electrons (cond-mat.str-el)Condensed Matter::SuperconductivityCondensed Matter - SuperconductivityFOS: Physical sciencesdescription
The pressure evolution of the Raman active electronic excitations of the transition metal dichalcogenides 2H-TaS$_2$ 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 the first observation of such Raman active Higgs mode since the longstanding unique case 2H-NbSe$_2$.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-06-09 |