Antiferromagnetic ordering in a 90 K copper oxide superconductor

J. A. Hodges; Y. Sidis; P. Bourges; I. Mirebeau; M. Hennion; X. Chaud

doi:10.1103/physrevb.66.020501

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Antiferromagnetic ordering in a 90 K copper oxide superconductor

J. A. Hodges·Y. Sidis·P. Bourges·I. Mirebeau·M. Hennion·X. Chaud

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Abstract

Using elastic neutron scattering, we evidence a commensurate antiferromagnetic Cu(2) order (AF) in the superconducting (SC) high-$\rm T_c$ cuprate $\rm YBa_2(Cu_{1-y}Co_y)_3O_{7+δ}$ (y=0.013, $\rm T_c$=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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J. A. Hodges, Y. Sidis, P. Bourges, I. Mirebeau, M. Hennion, X. Chaud. 2001-12-11. Antiferromagnetic ordering in a 90 K copper oxide superconductor. https://doi.org/10.1103/physrevb.66.020501

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