Abstract
Since the discovery of the high temperature superconductivity in cuprates, it has been believed by many researchers that an electronic mechanism could be responsible for the high values of Tc [1], A distinctive feature of high-Tc copper oxide superconductors is strong antiferromagnetic (AFM) exchange interaction (see, for example, [2]). The exchange binding energy of two holes with spin 1/2 in copper Cu(3d9) and oxygen O(2p6)ions comprises a value of order 1 eV, and the indirect (through oxygen ions) AFM exchange energy of holes in copper ions is of order 0.13 eV. If cuprates had a three- dimensional network of bonds for copper spins, the AFM Néel temperature in these materials could reach a record value 1500 K. However, because of the layered structure of cuprates the Néel temperature turns out to be much lower, TN ≃ 300 – 500 K, though still very high.
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Plakida, N.M., Anton, L., Adam, S., Adam, G. (2002). Exchange and Spin-Fluctuation Pairing in the Two-Band Hubbard Model. In: Annett, J.F., Kruchinin, S. (eds) New Trends in Superconductivity. NATO Science Series, vol 67. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0544-9_3
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