Magnetic Excitations in Superconducting YBa_2Cu_3O_<6+x> Crystals Studied by Neutron Inelastic Scattering

概要

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Magnetic excitation spectra in single crystals of YBa_2 Cu_3O_<6+x> with superconducting transition temperature T_c≃66 K (x≃0.75) and 90 K (x≃0.9) are reported. For excitation energies in the range 25-45 meV, a scan at fixed energy yields a single peak with a large q-width centered on the antiferromagnetic wave vector, (π, π), in agreement with the work of Rossat-Mignod and coworkers. However, in contrast to the results of the latter group, we have not observed, despite significant effort, any q-dependent magnetic scattering in either crystal at energies below 〜20 meV, even at temperatures far above T_c.
社団法人日本物理学会の論文
1993-01-15