Effects of Magnetic and non-Magnetic Impurities on the Superconducting State of YBa${}_2$Cu${}_3$O${}_{7-\delta }$

M. Le Tacon, A. Sacuto, Y. Gallais +3

We report Electronic Raman Scattering measurements on optimally doped Zn and Ni substituted YBCO in A${}_{1g}$ and B${}_{1g}$ channels. We show that the superconducting gap energy is i…