Mesoscopic Percolating Resistance Network in a Strained Manganite Thin Film
Mesoscopic Percolating Resistance Network in a Strained Manganite Thin Film
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DOI：
10.1126/science.1189925
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发表时间：
2010-07-09
期刊：
影响因子：
56.9
通讯作者：
Shen, Zhi-Xun
中科院分区：
文献类型：
--
作者：
Lai, Keji;Nakamura, Masao;Shen, Zhi-Xun
复杂氧化物中许多不寻常的行为与微观相分离的自发出现有着深刻的联系。根据潜在的机制，竞争相可以在非常不同的长度尺度上形成有序或随机的图案。用微波阻抗显微镜观察到应变Nd（1/2）Sr（1/2）MnO（3）薄膜中具有100纳米的大周期取向有序的晶格网络。非晶金属畴优先沿着衬底的某些晶轴排列，表明各向异性弹性应变是该系统中的关键相互作用。局部阻抗图提供了应变薄膜锰氧化物的滞后行为的微观电学信息，表明在低温下的玻璃秩序和巨磁阻效应之间的密切联系。
Many unusual behaviors in complex oxides are deeply associated with the spontaneous emergence of microscopic phase separation. Depending on the underlying mechanism, the competing phases can form ordered or random patterns at vastly different length scales. By using a microwave impedance microscope, we observed an orientation-ordered percolating network in strained Nd(1/2)Sr(1/2)MnO(3) thin films with a large period of 100 nanometers. The filamentary metallic domains align preferentially along certain crystal axes of the substrate, suggesting the anisotropic elastic strain as the key interaction in this system. The local impedance maps provide microscopic electrical information of the hysteretic behavior in strained thin film manganites, suggesting close connection between the glassy order and the colossal magnetoresistance effects at low temperatures.