Phys Rev Lett. 2007 Oct 5;99(14):147206. Epub 2007 Oct 3.

Distinct effects of homogeneous weak disorder and dilute strong scatterers on phase competition in manganites.

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Harish-Chandra Research Institute, Jhusi, Allahabad, India.

Abstract

We study the two orbital double-exchange model in two dimensions including antiferromagnetic (AFM) superexchange, Jahn-Teller coupling, and substitutional disorder. At hole doping x = 0.5 we focus on phase competition between the ferromagnetic metal (FMM) and the charge-ordered (CO) and orbital-ordered (OO) CE state and compare the impact of weak homogeneous disorder to that of a low density of strong scatterers. Even moderate homogeneous disorder suppresses the CE-CO-OO phase and leads to a glass with nanoscale correlations, while dilute strong scatterers of comparable strength convert the CE-CO-OO phase to a phase separated state with ferromagnetic metal and AFM-CO-OO clusters.

PMID:: 17930717; [PubMed]

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Distinct effects of homogeneous weak disorder and dilute strong scatterers on phase competition in manganites.

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