Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-05-17
Phys. Rev. B 78 064414 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 5 figures
Scientific paper
10.1103/PhysRevB.78.064414
Most previous investigations have shown that the surface of a ferromagnetic material may have antiferromagnetic tendencies. However, experimentally the opposite effect has been recently observed: ferromagnetism appears in some nano-sized manganites with a composition such that the antiferromagnetic charge-ordered CE state is observed in the bulk. A possible origin is the development of ferromagnetic correlations at the surface of these small systems. To clarify these puzzling experimental observations, we have studied the two-orbital double-exchange model near half-doping n=0.5, using open boundary conditions to simulate the surface of either bulk or nano-sized manganites. Considering the enhancement of surface charge density due to a possible AO termination (A = trivalent/divalent ion composite, O = oxygen), an unexpected surface phase-separated state emerges when the model is studied using Monte Carlo techniques on small clusters. This tendency suppresses the CE charge ordering and produces a weak ferromagnetic signal that could explain the experimental observations.
Dagotto Elbio
Dong Shuai
Liu Jian-Miin
Yu Rong
Yunoki Seiji
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