Charge and magnetic ordering in the electron-doped magnetoresistive materials CaMnO3-δ (δ=0.06,0.11)

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DOIResolve DOI: http://doi.org/10.1103/PhysRevB.64.064421
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TypeArticle
Journal titlePhysical review. B, Condensed matter and materials physics
Volume64
Issue6
Pages064421–; # of pages: 7
AbstractThe magnetoresistive “electron”-doped materials CaMnO3-δ (δ=0.06,0.11) have been investigated using powder neutron diffraction. The two materials are n-type semiconductors which exhibit antiferromagnetic ordering at TN∼125K, but they have different magnetic structures. The CaMnO2.94 sample orders in a simple G-type antiferromagnetic structure, which is also observed in CaMnO3. The CaMnO2.89 sample, on the other hand, exhibits two magnetic features: the G-type reflections as noted above, and a set of reflections that can be indexed on a k=(0,0,1/4) ordering wave vector. A model for the magnetic structure is proposed which involves Mn3+/Mn4+ charge ordering concomitant with the magnetic ordering. The presence of a set of weak, temperature independent structural reflections which can also be indexed on a k=(0,0,1/4) supercell suggests an oxygen vacancy ordering which may play a role in the charge ordering.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Steacie Institute for Molecular Sciences
Peer reviewedNo
NPARC number12339286
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Record identifierfceba597-4a90-4498-adbd-cd2567003990
Record created2009-09-11
Record modified2016-05-09
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