Two dimensional model for correlated eg electrons in doped nickelates

We investigate the magnetic, orbital and charge instabilities in eg band for the average filling by n = 2 – x electrons per site, as in La2–x Srx NiO4. The calculations were performed on 8 × 8 clusters, with electron correlations included within the local ansatz method. The C ‐type antiferromagnetic...

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Veröffentlicht in:	Physica Status Solidi (b) 2006-01, Vol.243 (1), p.155-158
Hauptverfasser:	ROSCISZEWSKI, Krzysztof, OLES, Andrzej M
Format:	Artikel
Sprache:	eng
Schlagworte:	71.10.Fd 71.15.Nc 71.27.+a 75.25.+z Collective effects Condensed matter: electronic structure, electrical, magnetic, and optical properties Electron states Exact sciences and technology Exchange, correlation, dielectric and magnetic functions, plasmons General theory and models of magnetic ordering Magnetic properties and materials Physics
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Beschreibung
Zusammenfassung:	We investigate the magnetic, orbital and charge instabilities in eg band for the average filling by n = 2 – x electrons per site, as in La2–x Srx NiO4. 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)
ISSN:	0370-1972 1521-3951
DOI:	10.1002/pssb.200562406