Abstract
The anomalous properties of a pairing gap in cuprate superconductors have been explained under the assumption that their electron systems in the normal phase exhibit a fermion condensate, i.e., a set of dispersionless states close to the nominal Fermi surface. It has been shown that exactly the fermion condensate is responsible for D-state pairing in cuprates. More specifically, the effective Coulomb repulsion in the Cooper channel, which prevents the existence of superconductivity in normal metals in the S channel, makes it high-temperature in the D channel.
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Original Russian Text © V.A. Khodel, J.W. Clark, M.V. Zverev, 2017, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2017, Vol. 105, No. 4, pp. 238–244.
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Khodel, V.A., Clark, J.W. & Zverev, M.V. Role of a fermion condensate in the structure of high-temperature pairing in cuprates. Jetp Lett. 105, 267–272 (2017). https://doi.org/10.1134/S0021364017040099
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DOI: https://doi.org/10.1134/S0021364017040099