<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mi>f</mml:mi></mml:math>noise in conducting Langmuir-Blodgett films

Galchenkov, L. A.; Иванов, С. Н.; Pyataikin, I. I.; Чернов, В. П.; Monçeau, P.

doi:10.1103/physrevb.57.13220

Cited by 6 publications

(8 citation statements)

References 8 publications

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“…18 Such an interpretation indeed has been suggested for explaining the large noise magnitude ͑7-8 orders of magnitude higher than expected from the Hooge formula͒ in bulk crystals of the quasi-one-dimensional organic charge-transfer salt TTF-TCNQ. 32 Assuming that crystal imperfections force the charge carriers to hop from stack to stack in the process of propagation along the stacking b axis, the authors estimate a number of charge propagation paths, which, in their model, explains the observed enhancement of the noise magnitude. Systematic studies of the noise level in a number of different quasi-two-dimensional organic charge-transfer salts ͑ET͒ 2 X are in progress in order to get a more detailed understanding of this effect.…”

Section: A Magnitude Of the Noisementioning

confidence: 97%

“…Since the Hooge expression is empirical, deviations may not be surprising and may point to differences in the conduction mechanism in the present molecular metals and the materials in which it works well. 32 This explanation includes the possibility that the large noise level could be an intrinsic property of the ͑ET͒ 2 X compounds originating, e.g., in an inhomogeneous current distribution, i.e., the current paths occupy only a small part of the total sample volume that enters in the above Hooge equation. 18 Such an interpretation indeed has been suggested for explaining the large noise magnitude ͑7-8 orders of magnitude higher than expected from the Hooge formula͒ in bulk crystals of the quasi-one-dimensional organic charge-transfer salt TTF-TCNQ.…”

Section: A Magnitude Of the Noisementioning

confidence: 99%

See 1 more Smart Citation

1/fnoise in the quasi-two-dimensional organic conductorκ−(BEDT-TTF)2
Müller
¹
,
Brandenburg
²
,
Schlueter
³

2009
Phys. Rev. B
24
1
29
0
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Resistance noise spectroscopy is applied to bulk single crystals of the quasi-two-dimensional organic conductor -͑BEDT-TTF͒ 2 Cu͓N͑CN͒ 2 ͔Cl both under moderate-pressure and at ambient-pressure conditions. When pressurized, the system can be shifted to the inhomogeneous coexistence region of antiferromagnetic insulating and superconducting phases, where percolation effects dominate the electronic fluctuations ͓J. Müller et al., Phys. Rev. Lett. 102, 047004 ͑2009͔͒. Independent of the pressure conditions, at higher temperatures we observe generic 1 / f ␣ -type spectra, typical for this class of quasi-two-dimensional organic chargetransfer salts. The magnitude of the electronic noise is extremely enhanced compared to typical values of homogeneous semiconductors or metals. This indicates that a highly inhomogeneous current distribution may be an intrinsic property of organic charge-transfer salts. The temperature dependence of the nearly 1 / f spectra can be very well described by a generalized random fluctuation model ͓P. Dutta, P. Dimon, and P. M. Horn, Rev. Lett. 43, 646 ͑1979͔͒. We find that the number of fluctuators and/or their coupling to the electrical resistance depend on the temperature. The phenomenological model explains a pronounced peak structure in the low-frequency noise at around 100 K, which is not observed in the resistivity itself, in terms of the thermally activated conformational degrees of freedom of the BEDT-TTF molecules' ethylene endgroups.

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Section: A Magnitude Of the Noisementioning

confidence: 97%

Section: A Magnitude Of the Noisementioning

confidence: 99%

1/fnoise in the quasi-two-dimensional organic conductorκ−(BEDT-TTF)2
Müller
¹
,
Brandenburg
²
,
Schlueter
³

2009
Phys. Rev. B
24
1
29
0
View full text Add to dashboard Cite

show abstract

“…[80] Indeed, such an interpretation has been suggested to explain the large g H values (7-8 orders of magnitude higher than expected) in films and crystals of the quasi-1D compound TTF-TCNQ. [127] In their model, the authors assume that crystal imperfections force the charge carriers to hop from stack to stack in the process of propagation along the stacking b-axis, which leads to a certain number of charge propagation paths. Since this number is fluctuating, the value of the noise is determined mainly by changes of the noisy volume W itself.…”

Section: Magnitude Of the Noisementioning

confidence: 99%

Fluctuation Spectroscopy: A New Approach for Studying Low‐Dimensional Molecular Metals

Müller

2011

ChemPhysChem

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Fluctuations (or noise) are often merely considered a nuisance, an unwanted disturbance limiting the accuracy of a scientific measurement. Electronic fluctuations, however, reveal hidden pieces of information not present in the mean quantity (the resistance) itself. Herein we describe resistance noise spectroscopy as a powerful new tool for investigating the low-frequency dynamics of electronic processes in low-dimensional organic conductors. Over the years, these molecular charge-transfer complexes have provided unprecedented model systems for exploring the physics of low-dimensional materials. The combination of low dimensionality with other parameters, specific to molecular conductors, sets the stage for Coulomb correlation effects to become relevant and, under certain circumstances, even to dominate the properties of the π-electron system. The combined effects of strong electron-electron and electron-phonon interactions give rise to the rich phenomenology of ground states encountered in these materials. To provide examples, we describe noise spectroscopy as a method to study the coupling of the correlated charge carriers to intramolecular modes of lattice vibrations and to investigate the inhomogeneous coexistence region of antiferromagnetic (Mott) insulating and superconducting phases.

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“…The possible formation of an inhomogeneous high conduction state was already discussed by Mori and coworkers 6 . This interpretation is supported by flicker noise studies revealing a pronounced noise level enhancement in organic charge-transfer salts which was also ascribed to the presence of an inhomogeneous current flow 25,26 . Additionally, we were restricted to two-probe measurements due to the high fields necessary to induce the resistive switching.…”

Section: Discussionmentioning

confidence: 66%

Energy exchange between phononic and electronic subsystems governing the nonlinear conduction inDCNQI2Cu

et al. 2015

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We present a dynamical study on the nonlinear conduction behaviour in the commensurate charge-density-wave phase of the quasi-one-dimensional conductor DCNQI 2 Cu below 75 K. We can accurately simulate magnitude and time-dependence of the measured conductivity in response to large voltage pulses by accounting for the energy exchange between the phononic and electronic subsystems by means of an electrothermal model. Our simulations reveal a distinct non-equilibrium population of optical phonon states with an average energy of E ph = 19 meV being half the activation energy of about ∆E a = 39 meV observed in DC resistivity measurements. By inelastic scattering, this hot optical phonon bath generates additional charge-carrying excitations thus providing a multiplication effect while energy transferred to the acoustic phonons is dissipated out of the system via heat conduction. Therefore, in high electric fields a preferred interaction of chargecarrying excitations with optical phonons compared to acoustic phonon modes is considered to be responsible for the nonlinear conduction effects observed in DCNQI 2 Cu.

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1/fnoise in conducting Langmuir-Blodgett films

Cited by 6 publications

References 8 publications

1/fnoise in the quasi-two-dimensional organic conductorκ−(BEDT-TTF)2
Müller
¹
,
Brandenburg
²
,
Schlueter
³

2009
Phys. Rev. B
24
1
29
0
View full text Add to dashboard Cite

1/fnoise in the quasi-two-dimensional organic conductorκ−(BEDT-TTF)2
Müller
¹
,
Brandenburg
²
,
Schlueter
³

2009
Phys. Rev. B
24
1
29
0
View full text Add to dashboard Cite

Fluctuation Spectroscopy: A New Approach for Studying Low‐Dimensional Molecular Metals

Energy exchange between phononic and electronic subsystems governing the nonlinear conduction inDCNQI2Cu

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1/fnoise in conducting Langmuir-Blodgett films

Cited by 6 publications

References 8 publications

1/fnoise in the quasi-two-dimensional organic conductorκ−(BEDT-TTF)2Müller1, Brandenburg2, Schlueter3 2009Phys. Rev. B241290View full textAdd to dashboardCite

1/fnoise in the quasi-two-dimensional organic conductorκ−(BEDT-TTF)2Müller1, Brandenburg2, Schlueter3 2009Phys. Rev. B241290View full textAdd to dashboardCite

Fluctuation Spectroscopy: A New Approach for Studying Low‐Dimensional Molecular Metals

Energy exchange between phononic and electronic subsystems governing the nonlinear conduction inDCNQI2Cu

Contact Info

Product

Resources

About

1/fnoise in the quasi-two-dimensional organic conductorκ−(BEDT-TTF)2
Müller
¹
,
Brandenburg
²
,
Schlueter
³

2009
Phys. Rev. B
24
1
29
0
View full text Add to dashboard Cite

1/fnoise in the quasi-two-dimensional organic conductorκ−(BEDT-TTF)2
Müller
¹
,
Brandenburg
²
,
Schlueter
³

2009
Phys. Rev. B
24
1
29
0
View full text Add to dashboard Cite