低掺杂锰氧化物单晶的非平衡1/f噪声
Nonequilibrium 1/f Noise in Low-doped Manganite Single Crystals
摘要：
本文研究了电流偏置La_（0.82）Ca_（0.18）MnO_3晶体的1/f噪声。噪声的温度依赖性如下的电阻率随温度的变化表明，电阻率波动构成一个固定的分数的总电阻率，独立的耗散机制和磁状态的系统。如对于平衡电阻率波动所预期的，噪声按电流的平方缩放。然而，在77 K，在偏置超过一些阈值，噪声强度开始随着偏置的增加而降低。非平衡噪声的出现解释偏置依赖的多步间接隧穿。
英文摘要：
1/f noise in current biased La0.82Ca0.18MnO3 crystals has been investigated. The temperature dependence of the noise follows the resistivity changes with temperature suggesting that resistivity fluctuations constitute a fixed fraction of the total resistivity, independently of the dissipation mechanism and magnetic state of the system. The noise scales as a square of the current as expected for equilibrium resistivity fluctuations. However, at 77 K at bias exceeding some threshold, the noise intensity starts to decrease with increasing bias. The appearance of nonequilibrium noise is interpreted in terms of bias dependent multi-step indirect tunneling.
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