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A Functional‐Integral Study of the t̃ pp ‐ J pd ‐ J dd Model for CuO 2 ‐Based Superconductors
Author(s) -
Bryja L.,
Kolley E.,
Kolley W.
Publication year - 1991
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221650219
Subject(s) - superexchange , saddle point , pairing , superconductivity , saddle , condensed matter physics , homogeneous , physics , doping , mathematical physics , mean field theory , function (biology) , t j model , hubbard model , mathematics , thermodynamics , geometry , mathematical optimization , evolutionary biology , antiferromagnetism , biology
A functional‐integral representation of the ˜ pp ‐ J pd ‐ J dd model for a CuO 2 layer in high‐T c superconductors is exploited in the saddle‐point approximation. The self‐consistent mean‐field scheme resulting from the static and homogeneous approximation of the saddle‐point equations is solved numerically at T = 0. The O‐hole pairing connected with the superconductivity is investigated as a function of the doping concentration of O holes. The interplay between the Cu–O Kondo‐type and the Cu–Cu superexchange interactions is illustrated.