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

Abstract

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.

arXiv comment4pages, 3figures,APL accepted

References in corpus (5)

• Noise Probe of the Dynamic Phase Separation in La2/3Ca1/3MnO3
• $1/f$ noise in variable range hopping conduction
• Orbital domain state and finite size scaling in ferromagnetic insulating manganites
• Low frequency 1/f noise in doped manganite grain-boundary junctions
• Direct Correlation between 1/f-magneto-noise and magnetoresistance in La0.7Sr0.3MnO3 and (La0.5Pr0.2)Ba0.3MnO3 manganites

Cited by in corpus (4)

• Carrier-number fluctuations in the 2-dimensional electron gas at the LaAlO3/SrTiO3 interface
• Non-Gaussian resistance noise in the ferromagnetic insulating state of a hole doped manganite
• Bias Dependent 1/f Conductivity Fluctuations in Low-Doped La${}_{1-x}$Ca${}_x$MnO${}_3$ Manganite Single Crystals
• Metastable Resistivity States and Conductivity Fluctuations in Low-doped La${}_{1-x}$Ca${}_x$MnO${}_3$ Manganite Single Crystals