Abstract
The competition between ferromagnetic metallic state due to double exchange and antiferromagnetic nonmetallic state due to an ordering of Mn 3+/Mn 4+ with 1/1 (charge ordering) has been studied with use of single crystals of perovskite-type manganese oxides prepared by the floating zone method. The charge-ordered state can be altered to a ferromagnetic metallic state by application of a magnetic field, which accompanies a change in resistivity by several orders of magnitude. This is one of the major origin of the colossal magnetoresistance (CMR) in these manganese oxides.
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