arXiv subjects

Evelina Tsoncheva

Publications and source records attributed to Evelina Tsoncheva.

2 recordsLinked to original sources

arXiv2007

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 $T_c$ support the idea that the $d-$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 Nd$_{2-x}$Ce$_{x}$CuO$_4$ and Pr$_{2-x}$Ce$_{x}$CuO$_4$ compounds.

cond-mat.supr-con↗

arXiv2005

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 $λ$. Second, we show that at a given $λ$, the value of the condensation energy strongly depends on the functional form of the effective pairing interaction $Γ(ω)$.

cond-mat.supr-con↗