Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1803395 | Journal of Magnetism and Magnetic Materials | 2006 | 4 Pages |
Abstract
The magnetic, transport, and optical properties of electron-doped Ca1âxLaxMnO3âδ single crystals with x⩽0.12 were studied. The magnetic measurements show that in single crystals with x=0 and 0.05 the G-type AFM phase with weak FM component is realized and in crystals with x=0.10 and 0.12 the G- and C-type AFM phases coexist. The C-type magnetic structure arises at less concentration of La than in polycrystalline samples as a result of oxygen vacancies being additional source of electrons. Under magnetic transitions in the G- and C-type phases, resistivity and magnetoresistance of the doped single crystals have anomalies. Optical absorption in IR range indicates formation of a charge gap in crystals with x=0.10 and 0.12 at appearance of the C-AFM and monoclinic phase with orbital/charge ordering. By comparing optical and transport properties, heterogeneous electronic state and its relation with heterogeneous magnetic state are shown.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
N.N. Loshkareva, A.V. Korolyov, N.I. Solin, E.V. Mostovshchikova, Yu.P. Sukhorukov, S.V. Naumov, A.M. Balbashov,