Two-band ferromagnetic Kondo lattice model on a ladder with quantum S = 3/2 core spins

✍ Scribed by D. R. Neuber; M. Daghofer; Andrzej M. Olés; Wolfgang von der Linden

• Book ID: 104557785
• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 177 KB
• Volume: 3
• Category: Article
• ISSN: 1862-6351
• DOI: 10.1002/pssc.200562404

✦ Synopsis

Abstract

The interplay of spin and orbital correlations in doped manganites is investigated on a ladder described by the ferromagnetic (FM) Kondo model. Upon doping, the one‐band model exhibits phase separation into an antiferromagnetic (AF) background due to t ~2__g__~ superexchange J ′ and either a hole‐rich FM phase or islandlike region of antiferromagnetically stacked polarons. In contrast, separated polarons are favored by the two‐band model at low doping. For suitable parameters, both the one‐orbital and two‐orbital model yield FM chains with AF coupling between them, reminiscent of the C ‐AF phase observed in manganites. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)