Antiferromagnetic ordering in superconducting YBa2Cu3O6.5
Abstract
Commensurate antiferromagnetic ordering has been observed in the superconducting high-Tc cuprate YBa2Cu3O6.5 ( Tc=55 K) by polarized and unpolarized elastic neutron scattering. The magnetic peak intensity exhibits a marked enhancement at Tc. Zero-field μ SR experiments demonstrate that the staggered magnetization is not truly static but fluctuates on a nanosecond time scale. These results point towards an unusual spin density wave state coexisting with superconductivity.
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