Abstract
Mössbauer spectroscopy is used to study electron self-localization in the superconducting cuprate paramagnetic compound Y–Ba–Cu–O. It is shown that the electrons in chains with self-localization form a phase with local magnetic ordering and relaxation time greater than 10−7 s. Analysis of the magnitude of the accompanying charge redistribution suggests that when an electron undergoes self-localization a pair of exchange-coupled electrons localized predominantly on the oxygen is formed. Such a quasiparticle, consisting of a pair of antiferromagnetically oriented atomic moments and a pair of self-localized electrons, possesses integral spin and can form a Bose condensate.
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