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1/f noise in current biased La0.82Ca0.18MnO3 crystals has been investigated.The temperature dependence of the noise follows the resistivity changes withtemperature suggesting that resistivity fluctuations constitute a fixedfraction of the total resistivity, independently of the dissipation mechanismand magnetic state of the system. The noise scales as a square of the currentas expected for equilibrium resistivity fluctuations. However, at 77 K at biasexceeding some threshold, the noise intensity starts to decrease withincreasing bias. The appearance of nonequilibrium noise is interpreted in termsof bias dependent multi-step indirect tunneling.

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