Effects of Magnetic and non-Magnetic Impurities on the Superconducting State of YBa₂Cu₃O₇₋δ
Tacon, M. Le · Sacuto, A. · Gallais, Y. · Sherman, E. · Forget, A. · Colson, D.
الأصل · EN
We report Electronic Raman Scattering measurements on optimally doped Zn and Ni substituted YBCO in A₁g and B₁g channels. We show that the superconducting gap energy is independant of magnetic Ni and non-magnetic Zn substitutions. On the contrary the collective A₁g mode follows the critical temperature Tc with two distinct slopes for Ni and Zn, and tracks the magnetic resonance seen in inelastic neutron scattering. We explain the unconventionnal energy dependence of the superconducting gap and discuss the behaviour of the A₁g mode within magnetic and non-magnetic impurities.
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