Nonequilibrium 1/<i>f</i><sup>γ</sup>noise in conducting films and contacts

Zhigal'skii, G. P.

doi:10.1070/pu2003v046n05abeh001244

Cited by 25 publications

(6 citation statements)

References 39 publications

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“…31, can be used to infer approximate attempt rates τ 0 and activation energy distributions D(E) : is referred to in the literature as "equilibrium 1/f noise", see e.g. references [28][29][30]. Of course this does not mean that the sample is in the state of total thermodynamic equilibrium concerning its microstate.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…Such noise is characterized by bias dependence which is considerably different from the quadratic power law. 29 Recently, we have intensively investigated conductivity noise of La 0.82 Ca 0.18 MnO 3 manganite crystals. 25,32 At high temperatures, La 0.82 Ca 0.18 MnO 3 is in a paramagnetic insulating state, and the resistivity, dominated by a hopping mechanism, increases with decreasing temperature, dR = dT < 0.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

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Metastable Resistivity States and Conductivity Fluctuations in Low-doped La$_{1-x}$Ca$_{x}$MnO$_3$ Manganite Single Crystals

Dolgin,

Belogolovskii,

et al. 2012

Preprint

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Conductivity noise in dc current biased La 0.82 Ca 0.18 MnO 3 single crystals has been investigated in different metastable resistivity states enforced by applying voltage pulses to the sample at low temperatures. Noise measured in all investigated resistivity states is of 1/f-type and its intensity at high temperatures and low dc bias scales as a square of the bias. At liquid nitrogen temperatures for under bias exceeding a threshold value, the behavior of the noise deviates from above quasiequilibrium modulation noise and depends in a non monotonic way on applied bias. The bias range of nonequilibrium 1/f noise coincides with the range at which the conductance increases linearly with bias voltage. This feature is attributed to a broad continuity of states enabling indirect inelastic tunneling across intrinsic tunnel junctions. The nonequilibrium noise has been ascribed to indirect intrinsic tunneling mechanism while resistivity changes in metastable states to variations in the energy landscape for charge carriers introduced by microcracks created by the pulse procedures employed.

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Section: Theoretical Backgroundmentioning

confidence: 99%

Section: Theoretical Backgroundmentioning

confidence: 99%

Metastable Resistivity States and Conductivity Fluctuations in Low-doped La$_{1-x}$Ca$_{x}$MnO$_3$ Manganite Single Crystals

Dolgin,

Belogolovskii,

et al. 2012

Preprint

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“…This is a manifestation of a nonequilibrium 1/f noise similar to that frequently observed in nonlinear, nonohmic systems. 18 However, in a difference to other nonlinear systems, the crossover to nonequilibrium noise in our sample is not associated with the onset of strong nonlinearity in the current-voltage (I − V ) characteristics. 15 Moreover, the intensity of nonequilibrium noise initially decreases with increasing bias, to change in a nonmonotonic way with further increase of the bias.…”

Section: Experimental Backgroundmentioning

confidence: 99%

Bias dependent 1/f conductivity fluctuations in low-doped La1−xCaxMnO3 manganite single crystals

Belogolovskii

Jung

Markovich

et al. 2011

Journal of Applied Physics

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Low frequency noise in current biased La 0.82 Ca 0.18 MnO 3 single crystals has been investigated in a wide temperature range from 79 K to 290 K. Despite pronounced changes in magnetic properties and dissipation mechanisms of the sample with changing temperature, the noise spectra were found to be always of the 1/f type and their intensity (except the lowest temperature studied) scaled as a square of the bias. At liquid nitrogen temperatures and under bias exceeding some threshold value, the behavior of the noise deviates from the quasi-equilibrium modulation noise and starts to depend in a non monotonic way on bias. It has been verified that the observed noise obeys Dutta and Horn model of 1/f noise in solids. The appearance of nonequilibrium 1/f noise and its dependence on bias have been associated with changes in the distribution of activation energies in the underlying energy landscape. These changes have been correlated with bias induced changes in the intrinsic tunneling mechanism dominating dissipation in La 0.82 Ca 0.18 MnO 3 at low temperatures.

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“…Though, one appropriate suggestion, -to be under consideration below, -was made already in [1][2][3][4], but it had not excited a response. Somehow or other, today we see reports on more and more inventive and fine measurements of 1/fnoise, -for example, in films of metals and alloys [5] or atomic layers of graphene [6], -but as before with no unambiguous indication in its origin. Citing [6], "... despite almost a century of research, 1/f noise remains a controversial phenomenon and numerous debates continue about its origin and mechanisms".…”

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confidence: 98%

Why nature needs 1/f-noise

Kuzovlev¹

2015

Usp. Fiz. Nauk

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Low-frequency 1/f-noise occurs at all levels of the nature organization and became an actual factor of nanotechnologies, but in essence it remains misunderstood by its investigators. Here, once again it is pointed out that such the state of affairs may be caused by uncritical application of probability theory notions to physical random phenomena, first of all the notion of "independence". It is shown that in the framework of statistical mechanics no medium could provide an inner wandering particle with quite certain value of diffusivity and mobility, thereby producing flicker fluctuations of these quantities. This is example of realization of universal 1/f-noise origin in many-particle systems: dependence of time progress of any particular relaxation or transport process on the whole system's detailed initial microstate.

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Nonequilibrium 1/f^γnoise in conducting films and contacts

Cited by 25 publications

References 39 publications

Metastable Resistivity States and 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

Bias dependent 1/f conductivity fluctuations in low-doped La1−xCaxMnO3 manganite single crystals

Why nature needs 1/f-noise

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Nonequilibrium 1/fγnoise in conducting films and contacts

Cited by 25 publications

References 39 publications

Metastable Resistivity States and 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

Bias dependent 1/f conductivity fluctuations in low-doped La1−xCaxMnO3 manganite single crystals

Why nature needs 1/f-noise

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Nonequilibrium 1/f^γnoise in conducting films and contacts