Superconducting energy gap of 2H−NbSe2 in phonon spectroscopy
F. Weber, S. Rosenkranz, R. Heid, A. H. Said
DOI 10.1103/PhysRevB.94.140504 · Physical Review B
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Abstract
We present a high-energy-resolution inelastic x-ray scattering data investigation of the charge-density-wave (CDW) soft phonon mode upon entering the superconducting state in 2H−NbSe2. Measurements were done close to the CDW ordering wave vector qCDW at q=qCDW+(0,0,l),0.15≤l≤0.5, for T=10K (CDW order) and 3.8K (CDW order+superconductivity). We observe changes of the phonon line shape that are characteristic for systems with strong electron-phonon coupling in the presence of a superconducting energy gap 2Δc and from which we can demonstrate an l dependence of the superconducting gap. Reversely, our data imply that the CDW energy gap is strongly localized along the c* direction. The confinement of the CDW gap to a very small momentum region explains the rather low competition and easy coexistence of CDW order and superconductivity in 2H−NbSe2. However, the energy gained by opening ΔCDW seems to be too small to be the driving force of the phase transition at TCDW=33K, which is better described as an electron-phonon coupling driven structural phase transition.
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