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Magnetic Models of Non‐Stoichiometric High‐Temperature Superconductors
Author(s) -
Sikakana I. Q.,
Lowther J. E.
Publication year - 1993
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221780219
Subject(s) - stoichiometry , superconductivity , condensed matter physics , copper , valence (chemistry) , magnetic susceptibility , oxygen , high temperature superconductivity , transition temperature , lattice (music) , materials science , charge ordering , cuprate , charge (physics) , chemistry , physics , organic chemistry , quantum mechanics , metallurgy , acoustics
Abstract Valence charge fluctuations on copper in high‐temperature superconductors can only give a spin‐½ system when copper is in the charge state Cu 2+ . As charge on the copper fluctuates because of lattice stoichiometry in turn related to the concentration of oxygen atoms, so the concentration of spin‐½ atoms varies. This is modelled with the magnetic interaction topology varying from being cubic to rectangular planar. In all cases various magnetic properties especially the magnetic transition temperature and susceptibility are calculated. It is suggested that the observed magnetic behaviour of oxygen deficient high‐temperature superconducting materials may be interpreted within such a magnetic model, with the magnetic interaction between adjacent superconducting layers varying with oxygen stoichiometry.