1D-3D crossover in hopping conduction of carbynes

Demishev, S. V.; Pronin, A. A.; Sluchanko, N. E.; Samarin, N. A.; Lyapin, A. G.; Бражкин, В. В.; Varfolomeeva, T. D.; Попова, С. В.

doi:10.1134/1.1331151

Cited by 8 publications

(13 citation statements)

References 5 publications

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“…Therefore, the reduction of s with the increase of T , together with the excess above unity of the parameter "m", appeared in Eq. (6), suggest that the simple-pair approximation of single hopping is incapable of explaining the observed data and the multiple hopping is thought to be the predominant process. 29 At a certain temperature T m , depending on the frequency, the conductivity σ(ω) peaks up then decreases with a further increase of T (see Fig.…”

Section: Resultsmentioning

confidence: 95%

“…Such phenomenon has been frequently ascribed to relaxation induced by motion of charge carriers, performing hopping between equilibrium sites. [1][2][3][4][5][6][7][8][9][10][11][12] In other systems, such as spinal magnetic ferrites, the process was assumed to be due to exchange of electrons between divalent and trivalent centers performing hopping transitions. [13][14][15][16][17][18] On the other hand, AC conduction in layered ceramics was assumed to be of a polaron hopping nature.…”

Section: Introductionmentioning

confidence: 99%

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AC HOPPING CONDUCTION IN LIGHTLY DOPEDInPAT LOW TEMPERATURES

2013

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In this paper, AC measurements on lightly doped n-InP were carried out as a function of temperature down to about 16 K and at frequencies in the range from 120 Hz up to 10 5 Hz. The AC conductivity at low temperatures is of a single hopping nature following the universal law; σ(ω) ∼ ω s , where the exponent, s, is temperature-independent. At relatively high temperatures (but still below the room temperature) the AC conductivity is of a multiple hopping nature.

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Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

AC HOPPING CONDUCTION IN LIGHTLY DOPEDInPAT LOW TEMPERATURES

2013

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“…15 The temperature dependence of the s parameter for the investigated OLC/PU composites (Fig. 5) indicates the one-dimensional variable range hopping behaviour of conductivity.…”

Section: -3mentioning

confidence: 84%

“…These two contributions can be distinguished by considering the frequency dependence of electrical conductivity, as it is was already performed for carbides. 15 At higher frequencies (x ) 2pf cr ), the electrical conductivity is directly proportional to frequency rðx; TÞ % x s T q :…”

Section: -3mentioning

confidence: 99%

Localization and electrical transport in onion-like carbon based composites

Macutkevič

Adomavičius

Krotkus

et al. 2012

Journal of Applied Physics

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Articles you may be interested inMetal-insulator transition and size dependent electrical percolation in onion-like carbon/polydimethylsiloxane composites J.Electrical transport properties of onion-like carbon (OLC) based composites over a wide (20 Hz-4 THz) frequency range are reported. The dependencies of dc conductivity on temperature can be approximated by the Mott law for one-dimensional variable range hopping below 130 K and by the typical law for fluctuation induced tunneling within the range of 130-300 K. The critical frequency at low temperatures also decreases according to the Mott law for one-dimensional variable range hopping. It was demonstrated that OLC annealing temperature plays a high role on the dielectric and electrical properties of composites at low temperatures. In the terahertz frequency range, the main contribution to the complex electrical conductivity is due to the phonon contribution while the contribution from hopping conduction vanishes at these frequencies. V C 2012 American Institute of Physics. [http://dx.

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“…Note that, if the parent carbyne is a high-resistivity semiconductor [17], processing at 600-800 ° C sharply reduces its resistivity [17,18]. As shown by Demishev et al [21][22][23][24] in studies of the electrical and galvanomagnetic properties of carbynes modified by exposure to high temperatures and pressures, the low-temperature conduction in such materials is due to hopping transport. Increasing the processing temperature from 700 to 900 ° C leads to a transition from quasi-one-dimensional to three-dimensional hopping.…”

Section: Introductionmentioning

confidence: 99%

High-Pressure Structural Transformations of Carbyne

et al. 2005

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The structure of cumulenic carbyne samples is studied by x-ray diffraction after exposure to high temperatures and pressures (200-900 ° C, 7.7 GPa). The results indicate that, with increasing temperature, carbyne transforms from a highly disordered to x-ray amorphous state, with narrower diffuse bands. At high temperatures, a disordered graphite-like structure is formed, with a density substantially lower than that of graphite. The behavior of impurities during the structural transformation of carbyne is discussed.

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1D-3D crossover in hopping conduction of carbynes

Cited by 8 publications

References 5 publications

AC HOPPING CONDUCTION IN LIGHTLY DOPEDInPAT LOW TEMPERATURES

AC HOPPING CONDUCTION IN LIGHTLY DOPEDInPAT LOW TEMPERATURES

Localization and electrical transport in onion-like carbon based composites

High-Pressure Structural Transformations of Carbyne

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