Nonequilibrium 1/f Noise in Low-doped Manganite Single Crystals

Details Nonequilibrium 1/f Noise in Low-doped Manganite Single Crystals Nonequilibrium 1/f Noise in Low-doped Manganite Single Crystals

2007-05-22

arxiv.org/abs/0705.3168v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4pages, 3figures,APL accepted

Scientific paper

10.1063/1.2748083

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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