Antiferromagnetic ordering in a 90 K copper oxide superconductor
2002; American Physical Society; Volume: 66; Issue: 2 Linguagem: Inglês
10.1103/physrevb.66.020501
ISSN1095-3795
AutoresJ.A. Hodges, Y. Sidis, P. Bourges, I. Mirebeau, M. Hennion, X. Chaud,
Tópico(s)Iron-based superconductors research
ResumoUsing elastic neutron scattering, we evidence a commensurate antiferromagnetic Cu(2) order (AF) ${(T}_{N}\ensuremath{\sim}330 \mathrm{K},$ $\ensuremath{\mu}\ensuremath{\sim}0.14 {\ensuremath{\mu}}_{\mathrm{B}})$ in the superconducting (SC) high-${T}_{c}$ cuprate ${\mathrm{YBa}}_{2}({\mathrm{Cu}}_{1\ensuremath{-}y}{\mathrm{Co}}_{y}{)}_{3}{\mathrm{O}}_{7+\ensuremath{\delta}}$ ${(y=0.013,T}_{c}=93 \mathrm{K}).$ We find that the spin excitation spectrum is still dominated by a magnetic resonance peak at 41 meV as in the Co-free system, but with a reduced spectral weight. The substitution of Co leads to a state where AF and SC cohabit at a microscopic scale, without any strong interference.
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