Comment on ``Quasiparticle Decay Effects in the Superconducting Density of States Evidence.pdfVIP
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Comment on ``Quasiparticle Decay Effects in the Superconducting Density of States Evidence
Comment on “Quasiparticle Decay Effects in the
Superconducting Density of States: Evidence for
d-Wave Pairing in the Cuprates”
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1 Georgios VARELOGIANNIS
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7 Dipartimento di Fisica
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0 Universit`a degli studi di Roma ”La Sapienza”
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9 Ple. A.Moro 2, 00185 Roma, Italy
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In a recent letter [1], D.Coffey and L.Coffey analyzed some characteristic anomalous
structures in tunneling and photoemission spectra of cuprates. They concluded that the
dip-like structure which appears above the gap might be considered as evidence for d-wave
pairing. In the analysis of [1], this structure is due to “deviations from weak coupling
mean-field behavior of the superconductivity in those materials”. While we perfectly agree
with this statement, we disagree with the analysis and conclusions of [1] as well with the
supposed origin of the deviations from mean-field behavior.
When quasiparticle lifetime effects become important, for the descritption of supercon-
ductivity it is necessary to consider a retarded strong coupling approach. The necessity
of a strong coupling approach is valid even if the symmetry of the pairing is d-wave [2].
The errors in the analysis and conclusions of [1] are due to the use of a non-retarded
framework, which should exclude quantitative comparison with experiment. In the case
of d-wave pairing for example, the use of a retarded formalism led to the reduction of
the critical temperature by an order of magnitude [2] compared to that obtained by a
non-retarded approach.
The arguments advanced in [1] related with a system
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