Abstract
We have shown that the unconventional temperature dependence of the static susceptibilityϰ(T) of the perovskite high-T c superconductors above the superconducting transition temperatureT c can be explained in terms of two relevant band models containing the singlet-correlated oxygen band and the copper character band. The usual copper-oxygen Hamiltonian containing hopping and Coulomb repulsion terms has been reduced to an effective Hubbard-liket-t′-t″-U eff model to describe the low-energy properties. The unusual behaviour of the susceptibility is due to thermally activated oxygen holes coming into the hybridization singularity peak in the density of states. A possible physical origin ofT max in the temperature dependence of the susceptibility is discussed.
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Eremin, M.V., Sigmund, E., Solovjanov, S.G. et al. The spin susceptibility of singlet correlated oxygen band in La2−x Sr x CuO4 . J Supercond 9, 299–305 (1996). https://doi.org/10.1007/BF00727552
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DOI: https://doi.org/10.1007/BF00727552