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Two dimensional model for correlated e g electrons in doped nickelates
Author(s) -
Rościszewski Krzysztof,
Oleś Andrzej M.
Publication year - 2006
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.200562406
Subject(s) - antiferromagnetism , electron , doping , non blocking i/o , condensed matter physics , charge (physics) , spin (aerodynamics) , ansatz , physics , order (exchange) , range (aeronautics) , phase (matter) , chemistry , materials science , quantum mechanics , finance , economics , composite material , thermodynamics , biochemistry , catalysis
We investigate the magnetic, orbital and charge instabilities in e g band for the average filling by n = 2 – x electrons per site, as in La 2– x Sr x NiO 4 . The calculations were performed on 8 × 8 clusters, with electron correlations included within the local ansatz method. The C ‐type antiferromagnetic phase was found in a broad range of doping, but distinct stripe phases could not be identified. The nonuniform orbital order is present for some dopings and couples to charge and spin order. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)