Digitalized magnetoresistance observed in (La,Pr,Ca)MnO3 nanochannel structures
Digitalized magnetoresistance observed in (La,Pr,Ca)MnO3 nanochannel structures
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DOI：
10.1063/1.2423235
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发表时间：
2006-12
影响因子：
4
通讯作者：
Y. Yanagisawa;Hidekazu Tanaka;T. Kawai;L. Pellegrino
中科院分区：
文献类型：
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作者：
Y. Yanagisawa;Hidekazu Tanaka;T. Kawai;L. Pellegrino
我们研究了不同沟道宽度的（La，Pr，Ca）MnO3沟道结构的磁电阻。500nm沟道在低温下表现出从电荷有序绝缘体到铁磁金属的急剧金属转变，而10 μ m和1μm沟道表现出渐变的金属转变。在10K时，金属跃迁的锐度从10μm通道的1.3×102T−1增加到500nm通道的3.5×104T−1。这种极端尖锐的金属转变可以解释为电子相分离现象。
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.