Nanoscale ferromagnetism in phase-separated manganites

Magnetic domain structures in phase-separated manganites were investigated by low-temperature Lorentz electron microscopy, in order to understand some unusual physical properties such as a colossal magnetoresistance (CMR) effect and a metal-to-insulator transition. In particular, we examined a spati...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2007-03, Vol.310 (2), p.870-872
Main Authors: Mori, S., Horibe, Y., Asaka, T., Matsui, Y., Chen, C.H., Cheong, S.W.
Format: Article
Language:English
Subjects:
Colossal magnetoresistance
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electron microscopy
Exact sciences and technology
Lorentz microscopy
Magnetic domains
Magnetic properties and materials
Magnetotransport phenomena, materials for magnetotransport
Manganites
Phase separation
Physics
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Summary:Magnetic domain structures in phase-separated manganites were investigated by low-temperature Lorentz electron microscopy, in order to understand some unusual physical properties such as a colossal magnetoresistance (CMR) effect and a metal-to-insulator transition. In particular, we examined a spatial distribution of the charge/orbital-ordered (CO/OO) insulator state and the ferromagnetic (FM) metallic one in phase-separated manganites; Cr-doped Nd 0.5 Ca 0.5 MnO 3 and ( La 1 - x Pr x ) 5 / 8 Ca 3 / 8 MnO 3 with x = 0.375 , by obtaining both the dark-field images and Lorentz electron microscopic ones. It is found that an unusual coexistence of the CO/OO and FM metallic states below a FM transition temperature in the two compounds. The present experimental results clearly demonstrated the coexisting state of the two distinct ground states in manganites.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2006.10.1076