Direct Measurement of Quasiparticle-Lifetime Broadening in a Strong-Coupled Superconductor

Temperature dependence of transport spin polarization inNdNi5from point-contact Andreev reflection

“…This slight increase is in qualitative agreement with the intrinsic decrease of the quasiparticle lifetime of the superconductor as theoretically predicted, 35 and experimentally observed in strong-coupling superconductors. 36,37 Figure 6͑a͒ shows the PCAR spectra on the CaFe 4 Sb 12 . In this case the PCAR spectra recorded at 3.5 K can be fitted only by incorporating a finite value of ⌫͑=0.35 meV͒.…”

Comparative photoemission studies on the superconducting gap of the filled skutterudite superconductors LaPt4Ge12and PrPt4Nakamura1, Okazaki2, Yoshida3 et al. 2012Phys. Rev. B246221View full textAdd to dashboardCite

“…In addition, we observed an identical spectral difference for The Dynes function is a modified BCS function that introduces phenomenological broadening effects into the BCS function and is known to describe a superconducting gap with isotropic s-wave symmetry very well. 16 The Dynes function is defined by…”

Strong-coupling analysis of scanning tunneling spectra in Bi2Sr2Ca2CuBerthod1, Fasano2, Maggio-Aprile3 et al. 2013Phys. Rev. B

“…(3) reduces to the BCS Green's function, with ξ k ≡ ε k − μ the noninteracting electron dispersion, μ the chemical potential, and a phenomenological scattering rate. 59 We use a tight-binding model for the band ε k , which reads (setting the lattice parameter a ≡ 1)…”