1998
DOI: 10.1103/physrevb.57.r11093
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Phenomenology of the low-energy spectral function in high-Tcsuperconductors

Abstract: We introduce a simple phenomenological form for the self-energy which allows us to extract important information from angle resolved photoemission data on the high Tc superconductor Bi2212. First, we find a rapid suppression of the single particle scattering rate below Tc for all doping levels. Second, we find that in the overdoped materials the gap ∆ at all k-points on the Fermi surface has significant temperature dependence and vanishes near Tc. In contrast, in the underdoped samples such behavior is found o… Show more

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Cited by 367 publications
(473 citation statements)
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“…E-E F (meV) affected by the temperature broadening effects 15 . Figure 4b presents the temperature dependence of the symmetrized EDCs at the Fermi momentum for the unrotated domains in FeSe B , and the gap decreases with increasing temperature and eventually closes above 73 K. In Fig.…”
Section: E-e F (Mev) E-e F (Mev)mentioning
confidence: 99%
“…E-E F (meV) affected by the temperature broadening effects 15 . Figure 4b presents the temperature dependence of the symmetrized EDCs at the Fermi momentum for the unrotated domains in FeSe B , and the gap decreases with increasing temperature and eventually closes above 73 K. In Fig.…”
Section: E-e F (Mev) E-e F (Mev)mentioning
confidence: 99%
“…For example, gap values have been predominantly measured using the approximate 'midpoint of leading edge' 15 or 'peak separation of symmetrized spectra' 1,2 techniques, each of which is known to fail in many limits. Phenomenological models 16 have also been used to fit gapped energy distribution curves 17 (EDCs), but because the EDC lineshape is not yet understood 18 , these fittings are not obviously better than the approximate measures.…”
mentioning
confidence: 99%
“…This alternative has to be explored especially for LBCO-1/8, where Γ ∆ near the node. Thus, we fit the E F -symmetrized EDCs at k F to a phenomenological model 25 that assumes a self-energy, (k F , ω) = −iΓ + (∆ 2 /ω) (Fit Model), where Γ and ∆ are subject to the fit (Fig. 3a).…”
mentioning
confidence: 99%