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We have examined the magnetoresistances of (La,Pr,Ca)MnO3 channel structures with different channel widths. The 500nm channel showed an extremely sharp metallic transition from charge ordered insulator to ferromagnetic metal at low temperature, while the 10 and 1μm channels showed gradual metallic transitions. The sharpness of the metallic transition was increased from 1.3×102T−1 in the 10μm channel to 3.5×104T−1 in the 500nm channel at 10K. Such extremely sharp metallic transition can be accounted for electronic phase separation phenomena.
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Yanagisawa et al. (2006) studied this question.
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