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Общее количество найденных документов : 123
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1.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrov M. I., Balaev D. A., Shaikhutdinov K. A., Khrustalev B. P., Aleksandrov K. S.
Заглавие : Critical currents in composites HTSC plus semiconductor at different concentrations of carriers
Место публикации : Dokl. Akad. Nauk. - 1996. - Vol. 346, Is. 5. - P.616-618. - ISSN 0869-5652
Примечания : Cited References: 7
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2.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Петров, Михаил Иванович, Balaev D. A., Шайхутдинов, Кирилл Александрович, Khrustalev B. P., Aleksandrov K. S.
Заглавие : Critical current in composites consisting of a high-temperature superconductor and a semiconductor as a function of the carrier concentration
Место публикации : Doklady Physics. - 1996. - Vol. 41, Is. 2. - P.59-61. - ISSN 1028-3358
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3.

Вид документа : Статья из сборника (том многотомника)
Шифр издания :
Автор(ы) : Vetrov S. Ya., Zharkova G. M., Khachaturyan V. M., Korets A. Ya., Sadreev A. F., Shabanov V. F.
Заглавие : Cholesteric LC orientation in spherical capsules of LC composites containing pyrimidine additives
Коллективы : International liquid crystal workshop on surface phenomena
Место публикации : Proceedings SPIE. - 1996. - Vol. 2731. - P.186-190
Аннотация: The reflection spectra of cholesteric liquid crystals dispersed in polymer and comprising pyrimidine dopes are investigated in the entire temperature range of the mesophase existence. One or several oxyphenyl substituents in an ortho position implemented into a pyrimidine system induce the second reflection region. The reflection curves for different wavelengths corresponding to regions I and II merge with temperature. Thermodynamically equilibrium states of polymer-dispersed cholesterics under the influence of polar pyrimidine dopes are considered. The pyrimidine effect is modulated by the orientational near-surface potential. The existence of two space regions of a spherical droplet with different helix pitches is validated. The natural helix pitch is retained inside the droplet while a new pyrimidine-induced pitch is formed in a layer close to the droplet surface. The results obtained describe the existence of two reflection regions and the temperature behavior of the helix pitch.
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4.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shalaev V. M., Poliakov E. Y., Markel V. A.
Заглавие : Small-particle composites .2. Nonlinear optical properties
Место публикации : Phys. Rev. B: AMERICAN PHYSICAL SOC, 1996. - Vol. 53, Is. 5. - P2437-2449. - ISSN 0163-1829, DOI 10.1103/PhysRevB.53.2437
Примечания : Cited References: 45
Предметные рубрики: FRACTAL CLUSTERS
RAMAN-SCATTERING
SUSCEPTIBILITY
CONDUCTIVITY
EXCITATIONS
COLLOIDS
LIGHT
Аннотация: Strong fluctuations of local fields may result in very large optical nonlinearities in small-particle composites. Enhancement associated with particle clustering is found for a number of optical processes, including four-wave mixing (FWM), third-harmonic generation (THG), Raman scattering, and nonlinear refraction and absorption in Kerr media. Field fluctuations and optical nonlinear susceptibilities are especially large in fractal clusters. The enhancement of optical processes is expressed in terms of the resonant linear absorption by collective dipolar eigenmodes in a cluster, and quality factors, q, of the modes (q much greater than 1). It is shown that the susceptibility of a composite material consisting of random small-particle clusters is proportional to q(3) for Raman scattering and the Kerr optical nonlinearity, and to q(4) and q(6) for THG and FWM, respectively. For all of these processes, a spectral dependence of the effective susceptibility is found. Broad-scale numerical simulations of the optical response in small-particle composites are performed to complement the theory. The simulations are in reasonable agreement with available experimental data.
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5.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrov M. I., Balaev D. A., Shaikhutdinov K. A., Khrustalev B. P., Aleksandrov K. S.
Заглавие : Transport properties of composites high temperature superconductor + semiconductor with different carrier concentration
Место публикации : Physica C-Superconductivity and its Applications. - 1997. - Vol. 282, Is. PART 4. - P.2449-2450. - ISSN 0921-4534
Ключевые слова (''Своб.индексиров.''): carrier concentration--critical current density (superconductivity)--high temperature superconductors--semiconductor materials--thermal effects--transport properties--superconductor semiconductor superconductor junctions--composite materials
Аннотация: Composites HTSC + semiconductor with different carrier concentrations were prepared as a model of Josephson type contacts. Experimental temperature dependences of the critical current density Jc(T) in the composites are presented. The best congruence of experiment with theory was reached for the Schussler-Kummel consideration of Andreev scattering in S-Sm-S (S-superconductor, Sm-semiconductor) junctions.
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6.

Вид документа :
Шифр издания :
Автор(ы) : Петров, Михаил Иванович, Balaev D. A., Ospishchev S. V., Шайхутдинов, Кирилл Александрович, Khrustalev B. P., Aleksandrov K. S.
Заглавие : Critical currents in bulk Y3/4Lu1/4Ba2Cu3O7 + BaPbO3 composites
Место публикации : Physics Letters, Section A: General, Atomic and Solid State Physics. - 1997. - Vol. 237, Is. 1-2. - P.85-89
Предметные рубрики: HIGH-TC-SUPERCONDUCTORS
WEAK LINKS
JUNCTIONS
Ключевые слова (''Своб.индексиров.''): bulk composites--critical current density--network of weak s-n-s links--ybacuo + bapbo3--ybacuo+bapbo3 bulk composites--network of weak s-n-s links--critical current density
Аннотация: Bulk composites Y3/4Lu1/4Ba2Cu3O7 + BaPbO3 with BaPbO3 volume content of 0-60% have been prepared. Temperature dependences of resistance and critical current density Jc(T) are presented. The best agreement of experimental Jc(T) with theory has been reached for the Gunsenheimer-Schussler-Kummel consideration of superconductor-normal metal-superconductor (S-N-S) junctions in the "clean" limit. В© 1997 Elsevier Science B.V.
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7.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrov M. I., Balaev D. A., Shaikhutdinov K. A., Khrustalev B. P., Aleksandrov K. S.
Заглавие : Transport properties of high-temperature superconductor plus semiconductor composites with different carrier concentration
Место публикации : Phys. Solid State: American Institute of Physics, 1997. - Vol. 39, Is. 5. - P.735-740. - ISSN 1063-7834, DOI 10.1134/1.1129959
Примечания : Cited References: 26
Предметные рубрики: CRITICAL CURRENTS
WEAK LINKS
JUNCTIONS
Аннотация: Results are presented of an experimental study of the temperature dependence of the electrical resistivity rho(T), critical current density J(c)(T), and current-voltage characteristics of polycrystalline composites based on the high-temperature superconductor Y3/4Lu1/4Ba2Cu3O7 and copper oxide with different lithium doping levels. The experimental temperature dependence of the critical current of composites with varying volume content of the semiconductor ingredient and varying charge carrier concentration are found to be in qualitative agreement with theory which takes account of Andreev reflection of the carriers at the S-Sm and Sm-S surfaces of the S-Sm-S Josephson junction (where S is the superconductor and Sm is the semiconductor). (C) 1997 American Institute of Physics.
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8.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrov M. I., Balaev D. A., Ospishchev S. V., Shaikhutdinov K. A., Khrustalev B. P., Aleksandrov K. S.
Заглавие : Characteristics of current flow in composites made from a high-temperature superconductor and the low-temperature superconducting metal oxide Ba(PbBi)O-3
Место публикации : Phys. Solid State: American Institute of Physics, 1997. - Vol. 39, Is. 3. - P.362-368. - ISSN 1063-7834, DOI 10.1134/1.1130134
Примечания : Cited References: 21
Предметные рубрики: BAPB1-XBIXO3 SYSTEM
YBA2CU3O7-DELTA
Аннотация: Composites are prepared from a high-temperature superconductor with the 1-2-3 structure and the low-temperature oxide BaPb3/4Bi1/4O3 with various volume concentrations of the high-temperature and low-temperature superconductors. The temperature dependences of the electrical resistivities and critical current densities of the composites are measured. It is shown experimentally that these composites comprise a synthetically created network of Josephson weak links (with a specified degree of coupling). (C) 1997 American Institute of Physics.
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9.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrov M. I., Balaev D. A., Ospishchev S. V., Shaihutdinov K. A., Khrustalev B. P., Aleksandrov K. S.
Заглавие : Critical currents in bulk Y3/4Lu1/4Ba2Cu3O7+BaPbO3 composites
Место публикации : Phys. Lett. A. - 1997. - Vol. 237, Is. 1-2. - P.85-89. - ISSN 0375-9601, DOI 10.1016/S0375-9601(97)00694-4
Примечания : Cited References: 24
Предметные рубрики: HIGH-TC-SUPERCONDUCTORS
WEAK LINKS
JUNCTIONS
Ключевые слова (''Своб.индексиров.''): ybacuo+bapbo3 bulk composites--network of weak s-n-s links--critical current density
Аннотация: Bulk composites Y3/4Lu1/4Ba2Cu3O7 + BaPbO3 with BaPbO3 volume content of 0-60% have been prepared. Temperature dependences of resistance and critical current density J(c)(T) are presented. The best agreement of experimental J(c)(T) with theory has been reached for the Gunsenheimer-Schussler-KUmmel consideration of superconductor-normal metal-superconductor (S-N-S) junctions in the "clean" limit. (C) 1997 Elsevier Science B.V.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrov M. I., Balaev D. A., Shaikhutdinov K. A., Khrustalev B. P.
Заглавие : Effect of thermal fluctuations on the resistive properties of HTSC+CuO composites
Место публикации : Phys. Solid State: AMER INST PHYSICS, 1997. - Vol. 39, Is. 11. - P1749-1750. - ISSN 1063-7834, DOI 10.1134/1.1130163
Примечания : Cited References: 11
Предметные рубрики: JOSEPHSON-JUNCTIONS
Аннотация: The effect of thermally activated phase slippage (TAPS) on the resistive properties of Y3/4Lu1/4Ba2Cu3O7+O-7 composites has been studied. The experimental temperature dependences of the electrical resistance are described in terms of the TAPS mechanism using the temperature dependences of the tunnel-junction critical current. (C) 1997 American Institute of Physics.
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