Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.
Nano Lett. 2013 Aug 14;13(8):3749-54. doi: 10.1021/nl4016842. Epub 2013 Jul 31.
Electronically phase separated manganite wires are found to exhibit controllable metal-insulator transitions under local electric fields. The switching characteristics are shown to be fully reversible, polarity independent, and highly resistant to thermal breakdown caused by repeated cycling. It is further demonstrated that multiple discrete resistive states can be accessed in a single wire. The results conform to a phenomenological model in which the inherent nanoscale insulating and metallic domains are rearranged through electrophoretic-like processes to open and close percolation channels.
电子相分离的锰氧化物线在局部电场下表现出可控的金属-绝缘体转变。开关特性被证明是完全可逆的、与极性无关的，并且对由反复循环引起的热击穿具有高度抗性。进一步表明，可以在单根线中访问多个离散的电阻状态。结果符合一种唯象模型，其中固有纳米尺度的绝缘和金属域通过电泳样过程进行重新排列，以打开和关闭渗流通道。
