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Measson, M. .-A., Gallais, Y., Cazayous, M., Clair, B., Rodiere, P., Cario, L. & Sacuto, A. (2014) Amplitude Higgs mode in the 2H-NbSe2 superconductor. Phys. Rev. B, 89 060503.
Added by: Florent Boucher (2016-04-29 09:26:44) |
| Type de référence: Article DOI: 10.1103/PhysRevB.89.060503 Numéro d'identification (ISBN etc.): 1098-0121 Clé BibTeX: Measson2014 Voir tous les détails bibliographiques  |
Catégories: PMN Mots-clés: a15 compounds, boson, charge-density waves, gap excitations, light, nbs2, phase, phonon, raman-scattering, transition Créateurs: Cario, Cazayous, Clair, Gallais, Measson, Rodiere, Sacuto Collection: Phys. Rev. B |
Consultations : 1/575
Indice de consultation : 4% Indice de popularité : 1% |
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We report experimental evidence for the observation of the superconducting amplitude mode, the so-called "Higgs" mode, in the charge density wave superconductor 2H-NbSe2 using Raman scattering. By comparing 2H-NbSe2 and its isostructural partner 2H-NbS2 which shows superconductivity but lacks the charge density wave order, we demonstrate that the superconducting mode in 2H-NbSe2 owes its spectral weight to the presence of the coexisting charge density wave order. In addition, temperature dependent measurements in 2H-NbSe2 show a full spectral weight transfer from the charge density wave mode to the superconducting mode upon entering the superconducting phase. Both observations are fully consistent with a superconducting amplitude mode or Higgs mode.
Added by: Florent Boucher |