1997
DOI: 10.1103/physrevb.56.5552
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Neutron-scattering profile ofQ0phonons in BCS superconductors

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Cited by 50 publications
(81 citation statements)
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“…In the normal state, on the other hand, the phonon spectrum exhibits an almost symmetric single peak with a low-energy tail, and the renormalized phonon frequency is softened by the el-ph coupling [34,39]. These features in the phonon spectra have indeed been experimentally observed in some strongly coupled SCs [44][45][46][47][48], and theoretically explained as an effect of the phonon self-energy [49] (phonon anomaly).…”
Section: A Dynamical Pair Susceptibility and Collective Amplitude Modesmentioning
confidence: 65%
“…In the normal state, on the other hand, the phonon spectrum exhibits an almost symmetric single peak with a low-energy tail, and the renormalized phonon frequency is softened by the el-ph coupling [34,39]. These features in the phonon spectra have indeed been experimentally observed in some strongly coupled SCs [44][45][46][47][48], and theoretically explained as an effect of the phonon self-energy [49] (phonon anomaly).…”
Section: A Dynamical Pair Susceptibility and Collective Amplitude Modesmentioning
confidence: 65%
“…The peak in |ReD R (ω)| around ω = 0.08 corresponds to this energy scale. This effect is known as the phonon anomaly in strongly coupled el-ph superconductors [24,[52][53][54], see also Fig. 6(c).…”
Section: B Nonequilibrium Steady States Under Phonon Drivingmentioning
confidence: 99%
“…Specifically, we evaluate the dynamical pair susceptibility under the excitation described by Eq. (53). For this, as in the equilibrium case [24], we add H ex (t) = F ex (t)B 0 on top of the phonon modulation, where…”
Section: Superconducting Fluctuations Above T C Under Phonon Drivingmentioning
confidence: 99%
“…That is, in the s ++ superconducting state, ReδΠ(Q 1 , ω) is positive for ω > 2∆ 0 . As we will see when we look at the phonon spectral weight, the negative dip for ω < ∼ 2∆ 0 leads to what Allen et al [20] have called a "vibrational/superelectronic" resonance. The structure of ReδΠ(Q 1 , ω) is quite difference in the s +− state.…”
Section: Fig 1 (Color Online)mentioning
confidence: 99%
“…Various authors [18][19][20] have shown that if the phonon frequency Ω q is greater than twice the gap ∆, but not too far above, significant spectral weight is transferred below 2∆ into a resonance. In addition, the phonon peak shifts to higher frequencies and broadens.…”
mentioning
confidence: 99%