Abstract
We study the spin singlet superconductivity exhibited in an itinerant Ising model Hamiltonian. This Hamiltonian models the Cu−O layers in highT c oxide superconductors. Electrons are itinerant through nearest neighbor hopping. An Ising term is introduced to describe the antiferromagnetic superexchange interaction between electrons nominally on nearest neighbor Cu sites. We discuss various symmetry states allowed by the model, and give detailed predictions of the superconducting energy gap, specific heat, susceptibility, andT c variation with carrier concentration. Results are compared to experimental data on highT c superconductors and reasonable agreement is obtained.
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Que, Wm., Kirczenow, G. HighT c superconductivity in the itinerant ising model: Spin singlet pairing. Z. Physik B - Condensed Matter 73, 425–432 (1989). https://doi.org/10.1007/BF01319372
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DOI: https://doi.org/10.1007/BF01319372