Amplitude Higgs mode in the 2H−NbSe2 superconductor

M.-A. Méasson; Y. Gallais; M. Cazayous; B. Clair; P. Rodière; L. Cario; A. Sacuto

doi:10.1103/PhysRevB.89.060503

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Amplitude Higgs mode in the 2H−NbSe2 superconductor

M.-A. Méasson, Y. Gallais, M. Cazayous, B. Clair, P. Rodière, L. Cario, A. Sacuto

DOI 10.1103/PhysRevB.89.060503 · Physical Review B

T1

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Abstract

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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb3Sn Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
V3Si Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown