2 research outputs found
Signatures of non-monotonic d-wave gap in electron-doped cuprates
We address the issue whether the data on optical conductivity and Raman
scattering in electron-doped cuprates below support the idea that the
wave gap in these materials is non-monotonic along the Fermi surface. We
calculate the conductivity and Raman intensity for elastic scattering, and find
that a non-monotonic gap gives rise to several specific features in optical and
Raman response functions. We argue that all these features are present in the
experimental data on NdCeCuO and PrCeCuO
compounds.Comment: 7 pages, 6 figure
Condensation energy in Eliashberg theory -- from weak to strong coupling
We consider two issues related to the condensation energy in superconductors
described by the Eliashberg theory for various forms of the pairing
interaction, associated either with phonon or electronic mechanisms of
superconductivity. First, we derive a leading correction to the BCS formula for
the condensation energy to first order in the coupling . Second, we
show that at a given , the value of the condensation energy strongly
depends on the functional form of the effective pairing interaction .Comment: 6 pages, 5 figures, published in PRB; missing reference has been
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