Antiferromagnetic ordering in a 90 K copper oxide superconductor

Abstract

Using elastic neutron scattering, we evidence a commensurate antiferromagnetic Cu(2) order (AF) in the superconducting (SC) high-${\mathrm{T}}_{\mathrm{c}}$ cuprate $\mathrm{YB}{\mathrm{a}}_2(\mathrm{C}{\mathrm{u}}_{1-\mathrm{y}}\mathrm{C}{\mathrm{o}}_{\mathrm{y}}{)}_3{\mathrm{O}}_{7+\delta }$ (y=0.013, ${\mathrm{T}}_{\mathrm{c}}$=93 K). As in the Co-free system, the spin excitation spectrum is dominated by a magnetic resonance peak at 41 meV but with a reduced spectral weight. The substitution of 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 sample where T${}_c$ remains optimum.

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