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Using elastic neutron scattering, we evidence a commensurateantiferromagnetic Cu(2) order (AF) in the superconducting (SC) high-$\rm T_c$cuprate $\rm YBa_2(Cu_{1-y}Co_y)_3O_{7+\delta}$ (y=0.013, $\rm T_c$=93 K). Asin the Co-free system, the spin excitation spectrum is dominated by a magneticresonance peak at 41 meV but with a reduced spectral weight. The substitutionof Co thus leads to a state where AF and SC cohabit showing that the CuO$_2$plane is a highly antiferromagnetically polarizable medium even for a samplewhere T$_c$ remains optimum.Comment: 3 figure

Antiferromagnetic ordering in a 90 K copper oxide superconductor