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Schrieffer‐Wolff Transformation of the p–d Model for Oxide Superconductors Charge Fluctuation Regime
Author(s) -
Lovtsov S. V.,
Yu. Yushankhai V.
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.2221660123
Subject(s) - spins , superconductivity , condensed matter physics , physics , transformation (genetics) , charge (physics) , amplitude , spin (aerodynamics) , quantum mechanics , chemistry , thermodynamics , biochemistry , gene
To describe low‐energy properties of the CuO 2 plane in oxide superconductors the effective interactions up to the fourth order in the p–d hybridization amplitude, V , are derived systematically by the Schrieffer‐Wolff transformation. Contrary to other analogous derivations the value of V is assumed to be comparable to the charge transfer gap, V ≈ Δ = ϵ p − ϵ p , that corresponds to the charge fluctuation (not spin fluctuation, V < Δ) regime in the system. Among the variety of relevant phenomena only a particular problem of magnetic frustrations in the system of Cu‐spins is examined.