A fluctuation mechanism of electron transitions in magnetic semiconductors

Volkov, A. G.; Povzner, A. A.; Podshivalova, O. V.; Shumikhina, K. A.; Anoshina, O. V.

doi:10.1007/s11182-006-0238-y

Cited by 3 publications

(4 citation statements)

References 6 publications

(9 reference statements)

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“…We shall discuss the behavior of σ depending on E(t) value. In weak electric fields (| E |≪ E pF ) when it is possible to neglect the dependence σ(E 2 ), the expression (50) coincides with the formula for the electric conductivity obtained in [52,53]:…”

Section: Discussionsupporting

confidence: 68%

“…In [52] it is shown that the expression (51) has correct asymptotics in the solid metal and the classical ideal plasma, and also describes continuous transition from the condensed state of metal to classical metal plasma. Besides, in [53] it is shown that the values of the electrical conductivity of copper non-ideal plasma calculated with (51) in nonideality parameter range of values 3 ≤ Γ ≤ 100 will be well coordinated with the results of experiments [56,57] (see also the report [58] in which these experiments are analyzed and a comparison with theoretical results of other authors is carried out). Not carrying out detailed quantitative comparison of the expressions ( 50) and (51) which will be a subject of a separate publication it is possible to draw a conclusion that σ(E 2 ) will be more or smaller than σ(E 2 = 0) only after the vanish of degeneration of the conduction electron gas of the metal (for |E| ≥ E pF ∼ 1 MV/cm).…”

Section: Discussionsupporting

confidence: 63%

“…Therefore we shall take advantage of results of one of us [52,53] in which within the framework of the plasma model the wide-range expression for time of the conduction electrons dispersion on the density fluctuations having correct asymptotics for the metal and classical plasma is determined as:…”

Section: The Electronic Conduction In High Pulse Electromagnetic Fieldsmentioning

confidence: 99%

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Dynamical equations and transport coefficients for the metals at high pulse electromagnetic fields

Volkov,

Chingina,

Yalovets

2016

Preprint

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We offer a metal model suitable for the description of fast electrophysical processes in conductors under influence of powerful electronic and laser radiation of femto-and picosecond duration, and also high-voltage electromagnetic pulses with picosecond front and duration less than 1 nanoseconds. The obtained dynamic equations for metal in approximation of one quasineutral liquid are in agreement with the equations received by other authors formerly. New wide-range expressions for the electronic conduction in strong electromagnetic fields are obtained and analyzed.

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Section: Discussionsupporting

confidence: 68%

Section: Discussionsupporting

confidence: 63%

Section: The Electronic Conduction In High Pulse Electromagnetic Fieldsmentioning

confidence: 99%

See 1 more Smart Citation

Dynamical equations and transport coefficients for the metals at high pulse electromagnetic fields

Volkov,

Chingina,

Yalovets

2016

Preprint

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“…In so doing, the volt-ampere characteristic of the sample assumes an S-shaped character. This points to the formation of bistable states of the electron subsystem and can be interpreted as formation of "cold" and "hot" semiconductor phases between which a kinetic electron transition can take place [1][2][3].…”

mentioning

confidence: 99%

Nonequilibrium phase transitions in ferromagnetic semiconductors (EuO1–δ)

Volkov¹,

Povzner²,

Cherepanova³

2009

Russ Phys J

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538.9The features of metal-semiconductor kinetic phase transformation in ferromagnetic semiconductors are studied. It is shown that heat release caused by current results in a positive feedback between the current density and the sample temperature, magnetization, and thermal-spin fluctuation amplitude. The Joule heating of the sample leads to disappearance of magnetization and, as a result, to restoration of the forbidden band between the conduction and valence bands. However, the energy gap width continues to change due to an increase in the fluctuations of internal exchange fields splitting the electron states. Within the framework of the developed model, an S-shaped volt-ampere characteristic is obtained for a EuO 1-δ , ferromagnetic semiconductor. The lower branch of the characteristic corresponds to a ferromagnetic metal state (a "cold" phase) and the upper one is due to a semiconductor paramagnetic state (a "hot" phase).

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Anomalous influence of an external magnetic field on spin fluctuations in magnetic semiconductors with strong p-d hybridization and the colossal magnetoresistance effect

Volkov

Povzner

2012

Phys. Solid State

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A fluctuation mechanism of electron transitions in magnetic semiconductors

Cited by 3 publications

References 6 publications

Dynamical equations and transport coefficients for the metals at high pulse electromagnetic fields

Dynamical equations and transport coefficients for the metals at high pulse electromagnetic fields

Nonequilibrium phase transitions in ferromagnetic semiconductors (EuO1–δ)

Anomalous influence of an external magnetic field on spin fluctuations in magnetic semiconductors with strong p-d hybridization and the colossal magnetoresistance effect

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