Investigations on the relationship between $T_c$ and the superconducting gap under magnetic and non-magnetic impurity substitutions in YBa${}_2$Cu${}_3$O${}_{7-\delta }$

Abstract

We report electronic Raman scattering measurements on optimally doped YBa2Cu3O7 where Zn or Ni impurities have been substituted by Cu. Using Raman selection rules, we have probed the superconducting gap in the nodal and antinodal regions. We show that under impurity substitutions, the energy of the antinodal peak detected in the superconducting state is not related to the critical temperature Tc and that signatures of superconductivity disappear in the nodal regions. Our experimental findings advocate in favor of gapless arcs around the nodes. The breakdown of the relationship between the antinodal gap amplitude and Tc is discussed in terms of local superconducting gap and pseudogap.

arXiv comment7 pages, 6 figures

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• Electronic and phononic Raman scattering in detwinned YBa${}_2$Cu${}_3$O${}_{6.95}$ and Y${}_{0.85}$Ca${}_{0.15}$Ba${}_2$Cu${}_3$O${}_{6.95}$: s-wave admixture to the $d_{x^2-y^2}$-wave order parameter
• Lattice dynamical signature of charge density wave formation in underdoped YBa2Cu3O6+x
• Superconducting pairing and the pseudogap in nematic striped La2-xSrxCuO4
• Suppression of Superfluid Density and the Pseudogap State in the Cuprates by Impurities
• Exploration of the Hg-based cuprate superconductors by Raman spectroscopy under hydrostatic pressure
• Energy Scales in the Raman spectrum of electrons and hole doped cuprates within competing scenarios
• Self-energy renormalization around the flux phase in the $t-J$ model: Possible implications in underdoped cuprates
• Bosonic excitation spectra of superconducting $\mathrm{B}{\mathrm{i}}_2\mathrm{S}{\mathrm{r}}_2\mathrm{CaC}{\mathrm{u}}_2{\mathrm{O}}_{8+\delta }$ and $\mathrm{YB}{\mathrm{a}}_2\mathrm{C}{\mathrm{u}}_3{\mathrm{O}}_{6+\mathrm{x}}$ extracted from scanning tunneling spectra