Spin excitons — a new mechanism of superconducting pairing in copper oxides |
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Authors: | S G Ovchinnikov |
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Institution: | (1) L. V. Kirenskii Institute of Physics, Russian Academy of Sciences, 660036 Krasnoyarsk, Russia |
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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.
Pis'ma Zh. éksp. Teor. Fiz. 64, No. 1, 23–28 (10 July 1996) |
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