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We propose a new model for impurity center formed by a cathion substitute forCu, like Zn, in CuO_{2} planes. Its main effect on superconducting electrons isdue to the non-zero exchange field on O sites, neighbors to the (non-magnetic)impurity. We discuss a strong suppression of d-wave order parameter, a zero-energy resonance in local density of states, and spin polarization of chargecarriers, which can be related to the experimentally observed effects inZn-doped copper oxides. These results are obtained \emph{without} using theunitary scattering limit.Comment: 4 pages, 3 figures, submitted to Europhys. Let

Magnetic effect from non-magnetic impurity in superconducting CuO 2 plane

Magnetic effect from non-magnetic impurity in superconducting CuO ₂ plane