Comment on: Nonmonotonic $d_{x^{2}-y^{2}}$ Superconducting Order Parameter in Nd$_{2-x}$Ce$_x$CuO$_4$

F. Venturini; R. Hackl; U. Michelucci

doi:10.1103/PhysRevLett.90.149701

paper

Comment on: Nonmonotonic $d_{x^{2} - y^{2}}$ Superconducting Order Parameter in Nd $_{2 - x}$ Ce $_{x}$ CuO $_{4}$

arXiv:cond-mat/0205415 · doi:10.1103/PhysRevLett.90.149701

Abstract

In a recent letter Blumberg and collaborators claim that a non-monotonic $d_{x^{2} - y^{2}}$ form for the superconducting order parameter is required to explain their Raman scattering measurements in Nd $_{2 - x}$ Ce $_{x}$ CuO $_{4}$ . In this comment we show with a simple model calculation that the basis for this conclusion is insufficient. The proposed functional dependence of the gap is neither consistent with their measured spectra nor compatible with other experimental results. Therefore the issue of the superconduing gap in electron-doped systems cannot be considered solved by now.

Comment to the paper by Blumberg et al., Phys. Rev. Lett., 88, 107002 (2002)

Comment on: Nonmonotonic dx2−y2​ Superconducting Order Parameter in Nd2−x​Cex​CuO4​

Abstract

Comment on: Nonmonotonic $d_{x^{2} - y^{2}}$ Superconducting Order Parameter in Nd $_{2 - x}$ Ce $_{x}$ CuO $_{4}$