Nonequilibrium 1/f noise in low-doped manganite single crystals

被引：20
作者：
Wu, X. D.
Dolgin, B.
Jung, G.
Markovich, V.
Yuzhelevski, Y.
Belogolovskii, M.
Mukovskii, Ya. M.
机构：
[1] Ben Gurion Univ Negev, Dept Phys, IL-84105 Beer Sheva, Israel
[2] Monash Univ, Dept Mat Engn, Clayton, Vic 3800, Australia
[3] Natl Acad Sci Ukraine, Donetsk Phys & Tech Inst, UA-83114 Donetsk, Ukraine
[4] Sci & Ind Concern Nauka, UA-04116 Kiev, Ukraine
[5] Moscow State Steel & Alloys Inst, Moscow 119049, Russia
来源：
APPLIED PHYSICS LETTERS | 2007年 / 90卷 / 24期
关键词：
D O I：
10.1063/1.2748083
中图分类号：
O59 [应用物理学];
学科分类号：
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 multistep indirect tunneling. (c) 2007 American Institute of Physics.
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