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Magnon‐Induced O‐Hole Interaction in a pd t J Model for CuO 2 Superconductors
Author(s) -
Bryja L.,
Kolley E.,
Kolley W.
Publication year - 1993
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.2221770222
Subject(s) - brillouin zone , pairing , quasiparticle , condensed matter physics , physics , antiferromagnetism , superconductivity , magnon , vertex (graph theory) , mathematical physics , ferromagnetism , mathematics , combinatorics , graph
An effective model for O‐hole quasiparticles is derived from the t ˜ pp – J pd – J dd – J pp (or pd t J ) model stemming from the minimal version of the Emery model. The underlying procedure involves an antiferromagnetic (AF) Holstein‐Primakoff transformation, a Schrieffer‐Wolff transformation, and an AF Bogolyubov transformation. The investigation of the diagonal part of the effective vertex shows the dominance of the AF magnon‐mediated repulsion over the a priori attraction between O‐hole quasiparticles along the boundaries of the magnetic Brillouin zone. In view of the pairing, formal similarities to the spin‐bag mechanism are pointed out.