Disordered electronic systems. II. Phase separation and the metal-insulator transition in metal-metalloid alloys

Sonntag, Joachim

doi:10.1103/physrevb.71.115114

Cited by 16 publications

(26 citation statements)

References 74 publications

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“…For a series of amorphous transition-metal-metalloid alloys, conclusion (i) and conclusion (ii) are now confirmed experimentally or supported by independent authors [ [47]. For details see [33] (Section 1 therein). Although the conclusion (iii) is not yet confirmed or supported by independent authors, there are a series of experimental findings supporting this conclusion (iii), as demonstrated in [32], where for some amorphous transition-metal-metalloid alloys it is shown that ρ versus ( )…”

Section: Electron Density In Nanocompositessupporting

confidence: 57%

“…comparison with the classical percolation theory concerning this critical value of i υ , see also [33] (Section 4.1 therein).…”

Section: Electronic Transport In Nanocompositesmentioning

confidence: 95%

“…"Large phase grains" means that the classical transport theory can be applied separately to each of the phase grains. This fact is immediarely plausible for crystalline phases, but also for amorphous phases as argued in [11] [32] [33].…”

Section: Composites With Large Phase Grainsmentioning

confidence: 98%

“…Without loss of generality, the external fields applied to the sample, ext E and B , have the directions of the X and Z axes, respectively. Then Equation (33) and Equation 35…”

Section: Hall Coefficientmentioning

confidence: 99%

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Electronic Transport in Alloys with Phase Separation (Composites)

Sonntag¹,

Lenoir²,

Ziółkowski³

2019

OJCM

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A measure for the efficiency of a thermoelectric material is the figure of merit defined by 2 ZT S T ρκ = , where S, ρ and κ are the electronic transport coefficients, Seebeck coefficient, electrical resistivity and thermal conductiviy, respectively. T is the absolute temperature. Large values for ZT have been realized in nanostructured materials such as superlattices, quantum dots, nanocomposites, and nanowires. In order to achieve further progress, (1) a fundamental understanding of the carrier transport in nanocomposites is necessary, and (2) effective experimental methods for designing, producing and measuring new material compositions with nanocomposite-structures are to be applied. During the last decades, a series of formulas has been derived for calculation of the electronic transport coefficients in composites and disordered alloys. Along the way, some puzzling phenomenons have been solved as why there are simple metals with positive thermopower? and what is the reason for the phenomenon of the "Giant Hall effect"? and what is the reason for the fact that amorphous composites can exist at all? In the present review article, (1), formulas will be presented for calculation of () 1 σ ρ = , κ , S, and R in composites. R, the Hall coefficient, provides additional informations about the type of the dominant electronic carriers and their densities. It will be shown that these formulas can also be applied successfully for calculation of S, ρ , κ and R in nanocomposites if certain conditions are taken into account. Regarding point (2) we shall show that the combinatorial development of materials can provide unfeasible results if applied noncritically.

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Section: Electron Density In Nanocompositessupporting

confidence: 57%

“…comparison with the classical percolation theory concerning this critical value of i υ , see also [33] (Section 4.1 therein).…”

Section: Electronic Transport In Nanocompositesmentioning

confidence: 95%

Section: Composites With Large Phase Grainsmentioning

confidence: 98%

“…Without loss of generality, the external fields applied to the sample, ext E and B , have the directions of the X and Z axes, respectively. Then Equation (33) and Equation 35…”

Section: Hall Coefficientmentioning

confidence: 99%

See 2 more Smart Citations

Electronic Transport in Alloys with Phase Separation (Composites)

Sonntag¹,

Lenoir²,

Ziółkowski³

2019

OJCM

Self Cite

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show abstract

“…To our knowledge, until now, there is no explanatory model which can interpret the phenomenon of GHE. In the present paper, we present a discussion of the reasons for the GHE applying the electron transfer model [1] [2] developed for metal-metalloid alloys. This model can be summarized by three points 1 :…”

Section: Introductionmentioning

confidence: 99%

The Origin of the Giant Hall Effect in Metal-Insulator Composites

Sonntag¹

2016

OJCM

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Near the metal-insulator transition, the Hall coefficient R of metal-insulator composites (M-I composite) can be up to 10 4 times larger than that in the pure metal called Giant Hall effect. Applying the physical model for alloys with phase separation developed in [1] [2], we conclude that the Giant Hall effect is caused by an electron transfer away from the metallic phase to the insulating phase occupying surface states. These surface states are the reason for the granular structure typical for M-I composites. This electron transfer can be described by       B A dn n d − = ⋅ ⋅ υ β υ [1] [2], provided that long-range diffusion does not happen during film production (n is the electron density in the phase A. A υ and B υ are the volume fractions of the phase A (metallic phase) and phase B (insulator phase). β is a measure for the average potential difference between the phases A and B). A formula for calculation of R of composites is derived and applied to experimental data of granular Cu1-y(SiO2)y and Ni1-y(SiO2)y films.

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Reduced thermal conductivity of Bi-In-Te thermoelectric alloys in a eutectic lamellar structure

Dreβler

Seyring

et al. 2018

Journal of Alloys and Compounds

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Disordered electronic systems. II. Phase separation and the metal-insulator transition in metal-metalloid alloys

Cited by 16 publications

References 74 publications

Electronic Transport in Alloys with Phase Separation (Composites)

Electronic Transport in Alloys with Phase Separation (Composites)

The Origin of the Giant Hall Effect in Metal-Insulator Composites

Reduced thermal conductivity of Bi-In-Te thermoelectric alloys in a eutectic lamellar structure

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