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Temperature effects in a spin‐orbital model for manganites
Author(s) -
Daghofer M.,
Neuber D. R.,
Oleś Andrzej M.,
von der Linden Wolfgang
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.200562464
Subject(s) - superexchange , antiferromagnetism , condensed matter physics , spins , ferromagnetism , spin (aerodynamics) , manganite , order (exchange) , physics , electron , phase (matter) , quantum mechanics , thermodynamics , finance , economics
We study a two‐dimensional effective orbital superexchange model derived for strongly correlated e g electrons coupled to t 2 g core spins in layered manganites. One finds that the ferromagnetic (FM) and antiferromagnetic (AF) correlations closely compete, and small changes of parameters can switch the type of magnetic order. For the same reason, spin order is easily destroyed with rising temperature, while alternating orbital correlations can persist to temperatures where FM order has already melted. A scenario for the AF phase observed in LaSrMnO 4 is presented. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)