Effective Connection of Phase-Separated Metallic Pathways under Low Magnetic Fields in Charge-Ordered Insulators of Micropatterned Perovskite Manganite Thin Films
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概要
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We investigated the probe size dependence of the electrical transport properties of perovskite manganite La0.67Ca0.33MnO3 (LCMO) films with electronic phase separation (EPS) between ferromagnetic metal and charge-ordered insulator phases. A micropatterned wire was fabricated by an excimer-laser-assisted metal organic deposition process. A patterned wire of an LCMO film with a width of 10 μm had a higher insulator–metal transition temperature associated with the ferromagnetic transition than that of an LCMO film with a large probe size. Moreover, a low-magnetic-field magnetoresistance (LFMR) effect was observed for the micropatterned wire film; the resistivity decreased only from $H\perp c > 0.02$ T. The origin of this LFMR effect is thought to be the effective connections of the ferromagnetic metal domains between the probe contacts with small dimensions similar to the size of the phase-separated metal and insulator domains. These properties were qualitatively explained by numerical simulations of resistance variations for different probe sizes.
- Physical Society of Japanの論文
- 2010-01-15
著者
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Manabe Takaaki
Advanced Manufacturing Research Institute National Institute Of Advanced Industrial Science And Tech
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Tsuchiya Tetsuo
Advanced Manufacturing Research Institute National Institute Of Advanced Industrial Science And Tech
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Nakajima Tomohiko
Advanced Manufacturing Research Institute National Institute Of Advanced Industrial Science And Tech
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Ueda Yutaka
Institute For Solid State Physic The University Of Tokyo
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Tsuchiya Tetsuo
Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
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Manabe Takaaki
Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
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Nakajima Tomohiko
Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
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