Physics – Condensed Matter – Superconductivity
Scientific paper
2007-10-11
Phys. Rev. B 76, 144505 (2007)
Physics
Condensed Matter
Superconductivity
7 pages, 6 figures
Scientific paper
10.1103/PhysRevB.76.144505
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.
Colson Dorothee
Forget Anne
Gallais Yann
Sacuto A.
Tacon M. Le
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