Abstract
The Fermi and Bose quasiparticle spectrum in copper oxides is studied in a many-band p-d model taking account of the strong electronic correlations. It is shown that hole-doped systems possess a Bose mode — a spin exciton — which is associated with the singlet-triplet excitation of the two-hole ground-state term of CuO4 clusters. Intercluster hopping leads to fermion-boson interaction with a spin exciton as the intermediate boson. Such a mechanism does not exist for n-type systems.
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Pis'ma Zh. Éksp. Teor. Fiz. 64, No. 1, 23–28 (10 July 1996)
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Ovchinnikov, S.G. Spin excitons — a new mechanism of superconducting pairing in copper oxides. Jetp Lett. 64, 25–31 (1996). https://doi.org/10.1134/1.567153
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DOI: https://doi.org/10.1134/1.567153