Ferromagnetic tendency at the surface of CE charge-ordered manganites

Simple item page
dc.creatorDong, Shuai
dc.creatorYu, Rong
dc.creatorYunoki, Seiji
dc.creatorLiu, J. -M.
dc.creatorDagotto, Elbio
dc.date2008-05-17
dc.date2008-07-10
dc.date.accessioned2026-07-07T09:56:45Z
dc.date.available2026-07-07T09:56:45Z
dc.descriptionMost 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.
dc.description8 pages, 5 figures
dc.identifierhttps://arxiv.org/abs/0805.2702
dc.identifierhttp://arxiv.org/abs/0805.2702
dc.identifierPhys. Rev. B 78 064414 (2008)
dc.identifierdoi:10.1103/PhysRevB.78.064414
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/167086
dc.subjectStrongly Correlated Electrons
dc.subjectMaterials Science
dc.titleFerromagnetic tendency at the surface of CE charge-ordered manganites
dc.typetext

Files

Collections

arXiv