| Records |
| Author |
Ptitsina, N. G.; Chulkova, G. M.; Gershenzon, E. M. |
Title  |
Influence of the interference of electron-phonon and electron-impurity scattering on the conductivity of unordered Nb films |
Type |
Journal Article |
| Year |
1995 |
Publication |
JETP |
Abbreviated Journal |
JETP |
| Volume |
80 |
Issue |
5 |
Pages |
960-964 |
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| Abstract |
The temperature dependence of the resistivity of Nb thin films has been studied at T=4.2-300 K. It has been shown that quantum interference between electron-phonon and electron-impurity scattering determines the temperature dependence of the resistivity of the films investigated over a broad temperature range. The magnitude of the contribution of the electron-phonon-impurity,interference is described satisfactorily by the theory developed by Reizer and Sergeev {Zh. Eksp. Teor. Fiz. 92,2291 (1987) [Sov. Phys. JETP 65, 1291 (1987)l). The interaction constants of electrons with longitudinal and transverse phonons in Nb films have been determined for the first time by comparing the experimental data with the theory. The values of the constants obtained are consistent with the data on the inelastic electron-phonon scattering times in the films investigated. The contribution of the transverse phonons is dominant both in the interference correction to the resistivity and in the electron energy relaxation. |
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RPLAB @ phisix @ |
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989 |
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Gershenzon, E. M.; Orlova, S. L.; Orlov, L. A.; Ptitsina, N. G.; Rabinovich, R. I. |
| Title |
Intervalley cyclotron-impurity resonance of electrons in n-Ge |
Type |
Journal Article |
| Year |
1976 |
Publication |
JETP Lett. |
Abbreviated Journal |
JETP Lett. |
| Volume |
24 |
Issue |
3 |
Pages |
125-128 |
| Keywords |
n-Ge, cyclotron-impurity resonance |
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1730 |
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Gershenzon, E. M.; Gol'tsman, G. N.; Ptitsina, N. G. |
| Title |
Investigation of free excitons in Ge and their condensation at submillimeter wavelengths |
Type |
Journal Article |
| Year |
1976 |
Publication |
Sov. Phys. JETP |
Abbreviated Journal |
Sov. Phys. JETP |
| Volume |
43 |
Issue |
1 |
Pages |
116-122 |
| Keywords |
Ge, free excitons |
| Abstract |
Results are presented of an investigation of free excitons in Ge in the submillimeter wavelength range for low as well as for high excitation levels when interaction between the excitons becomes important. The free-exciton energy spectrum is discussed. It is shown that the drop radii and their concentrations can be determined by measuring the temperature dependence of the free-exciton concentration. A section of the phase diagram is obtained in the 0.5-2.8 K temperature range for the free excitons+condensate system. |
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1731 |
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Gershenzon, E. M.; Gol'tsman, G. N.; Multanovskii, V. V.; Ptitsina, N. G. |
| Title |
Kinetics of electron and hole binding into excitons in germanium |
Type |
Journal Article |
| Year |
1983 |
Publication |
Sov. Phys. JETP |
Abbreviated Journal |
Sov. Phys. JETP |
| Volume |
57 |
Issue |
2 |
Pages |
369-376 |
| Keywords |
Ge, electron and hole binding |
| Abstract |
The kinetics of binding of free carriers'into excitons under stationary and nonstationary conditions is studied by investigating the submillimeter photoconductivity of Ge in a wide range of temperatures and of excitation levels. It is shown that the absolute values and the temperature dependence of the binding cross section (o- T-'.' ) can be satisfactorily described by the cascade recombination theory. The value of o and its temperature dependence differ significantly from the cross sections, measured in the same manner, for capture by attracting small impurities. Under nonstationary conditions, just as in the case of recombination with shallow impurities, a signifi- cant role is played by the sticking of the carriers in highly excited states. |
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1711 |
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Gershenzon, E. M.; Goltsman, G. N.; Multanovskii, V. V.; Ptitsina, N. G. |
| Title |
Kinetics of submillimeter impurity and exciton photoconduction in Ge |
Type |
Journal Article |
| Year |
1982 |
Publication |
Optics and Spectroscopy |
Abbreviated Journal |
Optics and Spectroscopy |
| Volume |
52 |
Issue |
4 |
Pages |
454-455 |
| Keywords |
Ge, exciton photoconduction |
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1715 |
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Gershenzon, Ye. M.; Goltsman, G. N.; Yelantyev, A. I.; Petrova, Ye. B.; Ptitsina, N. G.; Filatov, V. S. |
| Title |
Lecture demonstrations of properties of superconductors and liquid helium |
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Journal Article |
| Year |
1987 |
Publication |
USSR Rept Phys. Math. JPRS UPM |
Abbreviated Journal |
USSR Rept Phys. Math. JPRS UPM |
| Volume |
24 |
Issue |
7 |
Pages |
51 |
| Keywords |
demonstrations, lections |
| Abstract |
New demonstrations for low temperature physics courses are described. Two transparent Dewar vacuum flasks fitting one inside the other with the external flask for nitrogen and the internal flask for helium are used. The helium temperature can be regulated in the 4.2 to 1.6 K range and the effects of reducing helium to the superfluid state at 2.17 K can be shown: boiling abruptly stops and superfluid flow appears. In order to show the electric and magnetic characteristics of superconductivity, a superconducting NbTi solenoid containing nonsuperconducting wire and germanium and superconducting Nb materials with different critical temperatures is placed in the helium refrigerant vessel. The fall of the resistance at the critical temperatures can be shown. In order to show magnetic field and superconductive current flow properties a shunt of superconductive material is connected in parallel to the coil and is enclosed in a teflon container with a heater which can vary its temperature. When it is heated and not superconductive, magnetic field effects can be demonstrated and when it is unheated and superconducting a continuous current can be demonstrated. |
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1704 |
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Varyukhin, S. V.; Zakharov, A. A.; Gershenzon, E. M.; Gol'tsman, G. N.; Ptitsina, N. G.; Chulkova, G. M. |
| Title |
Low energy excitation in La2CuO4 |
Type |
Journal Article |
| Year |
1990 |
Publication |
Sverkhprovodimost': Fizika, Khimiya, Tekhnika |
Abbreviated Journal |
Sverkhprovodimost': Fizika, Khimiya, Tekhnika |
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3 |
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5 |
Pages |
832-837 |
| Keywords |
metal-dielectric-La2CuO4, monocrystals |
| Abstract |
Measurements of transmission and photoconductivity spectra in submillimeter wave length range as well as of capacity C and conductivity G in the region of acoustic frequencies of metal-dielectric-La2CuO4 system at low temperatures are performed using La2CuO4 monocrystals. Optical spectra posses a threshold character, a sharp decrease of transmission and photocoductivity signal occurs in the energy region hν>1.5 MeV. C(ω,T) and G(ω, T) dependences have a universal form typical of Debye type relaxation processes. Relaxation time dependence is of thermoactivated character τ(T)∼exp(ξ/T) with the gap value ξ≅2 meV. It is assumed that excitations with characteristic energy of ∼2 meV exist in La2CuO4. A possible nature of the detected low-energy excitations is discussed. |
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1688 |
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| Author |
Goltsman, G. N.; Maliavkin, A. V.; Ptitsina, N. G.; Selevko, A. G. |
| Title |
Magnetic exciton spectroscopy in uniaxially compressed Ge at submillimeter waves |
Type |
Conference Article |
| Year |
1986 |
Publication |
Izv. Akad. Nauk SSSR, Seriya Fizicheskaya |
Abbreviated Journal |
Izv. Akad. Nauk SSSR, Seriya Fizicheskaya |
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50 |
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280-281 |
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Ge, axial compression loads, excitons, germanium, magnetic spectroscopy, submillimeter waves, Zeeman effect |
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Russian |
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0367-6755 |
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3rd Vsesoiuznyi Seminar po Opticheskomu Detektirovaniiu Magnitnykh Rezonansov v Tverdykh Telakh, Kiev, Ukrainian SSR, May 1985 |
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1708 |
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Bondarenko, O. I.; Gershenzon, E. M.; Gurvich, Y. A.; Orlova, S. L.; Ptitsina, N. G. |
| Title |
Measurement of the width of the cyclotron resonance line of n-type Ge in quantizing magnetic fields |
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Journal Article |
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1972 |
Publication |
Presumably: Sov. Phys. Semicond. | Физика и техника полупроводников |
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Presumably: Sov. Phys. Semicond. | Физика и техника полупроводников |
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6 |
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362-363 |
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Ge, cyclotron resonance, quantizing magnetic fields |
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1774 |
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Verevkin, A. A.; Ptitsina, N. G.; Smirnov, K. V.; Voronov, B. M.; Gol’tsman, G. N.; Gershenson, E. M.; Yngvesson, K. S. |
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Multiple Andreev reflection in hybrid AlGaAs/GaAs structures with superconducting NbN contacts |
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Journal Article |
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1999 |
Publication |
Semicond. |
Abbreviated Journal |
Semicond. |
| Volume |
33 |
Issue |
5 |
Pages |
551-554 |
| Keywords |
2DEG, AlGaAs/GaAs heterostructures |
| Abstract |
The conductivity of hybrid microstructures with superconducting contacts made of niobium nitride to a semiconductor with a two-dimensional electron gas in a AlGaAs/GaAs heterostructure has been investigated. Distinctive features of the behavior of the conductivity indicate the presence of multiple Andreev reflection at scattering centers in the normal region near the superconductor-semiconductor boundary. |
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1063-7826 |
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1571 |
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