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Jahn–Teller effect and superexchange in half‐doped manganites
Author(s) -
Sikora O.,
Oleś A. M.
Publication year - 2003
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.200301684
Subject(s) - superexchange , condensed matter physics , phase diagram , coulomb , jahn–teller effect , doping , electron , phase (matter) , exchange interaction , physics , chemistry , ion , antiferromagnetism , quantum mechanics , ferromagnetism
We investigate the stability of the charge exchange (CE) phase within a microscopic model which describes a single plane as in La 0.5 Sr 1.5 MnO 4 . The model includes Coulomb interactions (on‐site and intersite), the Jahn–Teller term and the superexchange interactions due to e g and t 2 g electrons. By investigating the phase diagram at T = 0 in mean‐field approximation we conclude that the superexchange interactions can stabilize the CE phase, but only if they are stronger than estimated from spectroscopy.