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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ткачев Е. Н., Буряков, Тимофей Игоревич, Кузнецов В. Л., Мосеенков С. И., Мазов, Илья Николаевич, Попков, Сергей Иванович, Шайхутдинов, Кирилл Александрович
Заглавие : Электропроводящие свойства бумаги, состоящей из многослойных углеродных нанотрубок
Коллективы : Совещание по физике низких температур (36; 2012 ; июль ; 2-6; Санкт-Петербург)
Место публикации : Журн. эксперим. и теор. физ. - 2013. - Т. 143, Вып. 5. - С. 991-997. - DOI 10.7868/S004445101305025X
Аннотация: Исследована электропроводность σ(T) в интервале температур 4.2-295 K и магнитосопротивление ρ(B) при разных температурах в магнитных полях до 9 Тл бумаги, состоящей из многослойных углеродных нанотрубок (МУНТ). На температурной зависимости электропроводности бумаги σ(T) наблюдаются двумерные квантовые поправки к проводимости ниже 10 K. Из зависимостей отрицательного магнитосопротивления ρ(B) бумаги при различных температурах были оценены длины сбоя фазы волновой функции электронов проводимости и получена зависимость от температуры L\varphi=const• T-p/2, где p ≈ 1/3. Подобные зависимости проводимости σ(T), магнитосопротивления ρ(B) и длины сбоя фазы Lφ(T) наблюдали и для исходных порошков МУНТ, использованных для получения бумаги.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tkachev E. N., Buryakov T. I., Kuznetsov V. L., Mosenkov S. I., Mazov I. N., Popkov S. I., Shaikhutdinov K. A.
Заглавие : Current-conducting propertiesof paper consisting of muktiwall carbon nanotudes
Место публикации : J. Experim. Theor. Phys.: Pleiades Publishing, 2013. - Vol. 116, Is. 5. - P.860-865. - DOI 10.1134/S1063776113050257
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Dubrovskii A. A., Popkov S. I., Gokhfeld D. M., Semenov S. V., Shaikhutdinov K. A., Petrov M. I.
Заглавие : Specific features in the hysteretic behavior of the magnetoresistance of granular high-temperature superconductors
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 54, Is. 11. - P.2155-2164. - ISSN 1063-7834, DOI 10.1134/S1063783412110030
Примечания : Cited References: 52. - This study was supported by the Russian Foundation for Basic Research within the framework of the Regional Competition SIBERIA (project no. 11-02-98007 r-sibir'_a).
Предметные рубрики: CURRENT-VOLTAGE CHARACTERISTICS
WEAK MAGNETIC-FIELDS
CRITICAL-CURRENT DENSITY
T-C SUPERCONDUCTORS
ANGULAR-DEPENDENCE
JOSEPHSON MEDIUM
TRANSPORT-PROPERTIES
CRITICAL-STATE
YBa2Cu3O7-DELTA
COMPOSITES
Аннотация: The behavior of the hysteresis of the magnetoresistance R(H) of granular high-temperature superconductors has been investigated under the conditions where the resistive response of the subsystem of grain boundaries close to saturation. The hysteretic dependences R(H) have been measured for Y1-xPrxBa2Cu3O7 samples at x = 0.11 and 0.04 with the transition temperatures T-C approximate to 85.5 and 91.0 K, respectively. The evolution of the field width of the hysteresis R(H) has been examined by varying the measuring current. The limit of the applicability has been established for the concept of the effective field in the intergranular medium, which was previously proposed for the description of the hysteretic behavior of the magnetoresistance R(H) and thermal magnetic prehistory of the granular high-temperature superconductors. In the studied samples, the approximation of the effective field in the intergranular medium is applicable until the magnetoresistance of the subsystem of grain boundaries exceeds (90 +/- 5)% of the maximum value.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bykov A. A., Terent'yev K. Yu., Gokhfeld D. M., Petrov M. I.
Заглавие : Fractal dimension of cluster boundaries in porous polycrystalline HTSC materials
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 54, Is. 10. - P.1947-1950. - ISSN 1063-7834, DOI 10.1134/S1063783412100095
Примечания : Cited References: 20
Предметные рубрики: CURRENT-VOLTAGE CHARACTERISTICS
ELECTRICAL-CONDUCTIVITY
PERCOLATION
MIXTURES
MEDIA
SUPERCONDUCTORS
TRANSPORT
SPHERES
Аннотация: The fractal dimension of the boundaries of clusters formed by pores and granules in polycrystalline materials is shown to be determined by the sample density and crystallite sizes. The dependence of the fractal dimension on the density has a maximum. It is shown that the maximum diamagnetic response can be obtained in a porous high-temperature superconductor with a porosity of 50-60% and small crystallite sizes.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Volkov N. V., Eremin E. V., Tarasov A. S., Varnakov S. N., Ovchinnikov S. G.
Заглавие : Bias-current and optically driven transport properties of the hybrid Fe/SiO 2/p-Si structures
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Diffusion and Defect Data Pt.B: Solid State Phenomena. - 2012. - Vol. 190. - P.526-529. - ISBN 1012-0394, DOI 10.4028/www.scientific.net/SSP.190.526. - ISBN 9783037854365
Ключевые слова (''Своб.индексиров.''): hybrid structure--mis transition--photoelectric effect--schottky barrier--channel switching--comparative analysis--electron hole pairs--fe films--fe layer--ferromagnetic films--hybrid structure--optical effects--optical radiations--photogeneration--planar geometries--schottky barriers--semiconductor substrate--temperature variation--critical currents--interfaces (materials)--magnetic materials--photoelectricity--schottky barrier diodes--silicon--switching circuits--transport properties
Аннотация: Pronounced optical- and bias-current-sensitive features of the transport properties of a Fe/SiO 2/p-Si hybrid structure in planar geometry at temperature variation are investigated. Comparative analysis of two Fe/SiO 2/p-Si samples, one with a continuous Fe film and the other with two electrodes formed from a Fe layer and separated by a micron gap, shows that these features are due to the MIS transition with a Schottky barrier near the interface between SiO 2 and p- Si. Resistance of such a MIS transition depends exponentially on temperature and bias. In the structure with a continuous ferromagnetic film, the competition between conductivities of the MIS transition and the Fe layer results in the effect of current channel switching between the Fe layer and a semiconductor substrate. Within certain limits, this process can be controlled by a bias current and optical radiation. The mechanism of the optical effect is photogeneration of electron-hole pairs in the semiconductor substrate near its boundary with SiO 2 layer. В© (2012) Trans Tech Publications.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Volkov N. V., Rautskii M. V., Eremin E. V., Patrin G. S., Kim P. D., Lee C. G.
Заглавие : Response of a manganite-based magnetic tunnel structure to microwave radiation
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Diffusion and Defect Data Pt.B: Solid State Phenomena. - 2012. - Vol. 190. - P.125-128. - ISBN 978, DOI 10.4028/www.scientific.net/SSP.190.125. - ISBN 9783037854365
Ключевые слова (''Своб.индексиров.''): magnetic tunnel structure--microwave detection effect--spintronics--current flowing--current-in-plane geometry--magnetic tunnels--magnetization dynamics--microwave detection--non-linearity--rectification effects--spin-polarized currents--voltage signals--magnetic materials--magnetoelectronics--manganese oxide--microwaves--magnetism
Аннотация: We demonstrate that a magnetic tunnel structure irradiated by microwaves can generate a significant voltage signal due to the rectification effect. The measurements were carried out using current-in-plane geometry with a current flowing parallel to the interfaces in the structure. A value of the microwave-induced voltage strongly depends on a bias current and can be driven by a magnetic field. The rectification effect is discussed both in "Classical" terms of nonlinearity of the current-voltage characteristic and using a mechanism that involves the interplay between the spinpolarized current and magnetization dynamics in the magnetic tunnel structure. В© (2012) Trans Tech Publications.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kolovsky A. R.
Заглавие : Master equation approach to conductivity of bosonic and fermionic carriers in one- and two-dimensional lattices
Коллективы : Russian Academy of Sciences through the SB RAS integration Project [29]
Место публикации : Ann. Phys.-Berlin: Wiley-VCH Verlag, 2014. - Vol. 526, Is. 1/2. - P.102-111. - ISSN 0003-3804, DOI 10.1002/andp.201300169. - ISSN 1521-3889
Примечания : Cited References: 24. - The author express his gratitude to D.N. Maksimov for useful remarks and acknowledge financial support of Russian Academy of Sciences through the SB RAS integration Project No. 29 (Dynamics of atomic Bose-Einstein condensates in optical lattices).
Предметные рубрики: CONDUCTANCE
Ключевые слова (''Своб.индексиров.''): diffusive current--the hall effect
Аннотация: The master equation approach to diffusive current of bosonic or fermionic carriers in one- and two-dimensional lattices is discussed. This approach is shown to reproduce all known results of the linear response theory, including the integer quantum Hall effect for fermionic carriers. The main advantage of the approach is that it allows to calculate the current beyond the linear response regime where new effects are found. In particular, the Hall current can be inverted by changing orientation of the static force (electric field) relative to the primary axes of the lattice.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ushakov A. V., Karpov I. V., Lepeshev A. A., Petrov M. I., Fedorov L. Y.
Заглавие : Study of magnetic flux pinning in granular YBa2Cu3O7-y / nanoZrO2 composites
Коллективы : Ministry of Education and Sciences of the Russian Federation [7.4484.2011]
Место публикации : JETP Letters. - 2014. - Vol. 99, Is. 2. - P.99-103. - ISSN 0021-3640, DOI 10.1134/S002136401402009X. - ISSN 1090-6487
Примечания : Cited References: 15. - This work was supported in part by the Ministry of Education and Sciences of the Russian Federation (project no. 7.4484.2011).
Предметные рубрики: TEMPERATURE SUPERCONDUCTING WIRE
CRITICAL-CURRENT-DENSITY
FILMS
Аннотация: IIn this work, the effect of ZrO2 nanoparticles prepared in a low-pressure arc discharge plasma on magnetic flux pinning of granular YBa2Cu3O7-y /nanoZrO2 composites has been studied. It has been shown that the ZrO2 nanoparticles do not change the superconducting transition and the microstructure of superconductors. At a temperature of 5 K, the addition of 0.5 and 1 wt % of ZrO2 nanoparticles may lead to the additional effect of magnetic flux pinning and the increase in the critical current density J c. The J c value for composites with 1 wt % is two times larger than that for the reference sample. The fishtail effect is observed for YBa2Cu3O7-y /nanoZrO2 composites at the temperatures of 20 and 50 K. The problems associated with the additional effect of magnetic flux pinning of granular YBa2Cu3O7-y /nanoZrO2 composites and the appearance of the fishtail effect have been discussed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Popkov S. I., Shaikhutdinov K. A., Petrov M. I., Gokhfeld D. M.
Заглавие : Magnetoresistance of porous polycrystalline HTSC: Effect of the transport current on magnetic flux compression in intergranular medium
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2014. - Vol. 56, Is. 8. - P.1542-1547. - ISSN 1063-7834, DOI 10.1134/S1063783414080034. - ISSN 1090-6460
Примечания : Cited References: 47
Предметные рубрики: HIGH-TEMPERATURE SUPERCONDUCTOR
CURRENT-VOLTAGE CHARACTERISTICS
GRANULAR YBA2CU3O7-DELTA
JOSEPHSON MEDIUM
RESISTIVE TRANSITION
BULK COMPOSITES
T-C
FIELD
DISSIPATION
PHASE
Аннотация: The hysteretic dependences of the magnetoresistance of porous (38% of the theoretical density) granular high-temperature superconductor (HTSC) Bi1.8Pb0.3Sr1.9Ca2Cu3O (x) have been analyzed in the model of the effective intergranular field. This effective field has been defined by the superposition of the external field and the field induced by magnetic moments of superconducting grains. The magnetic flux compression in an intergranular medium, characterized by the effective field, controls the hysteretic behavior of the magnetoresistance. It has been found that the magnetoresistance hysteresis width for the studied porous HTSC depends on the transport current, in contrast to the superconductor of the same composition with high physical density (more than 90% of the theoretical value). For a porous superconductor, a significant current concentration occurs in the region of the grain boundaries, which is caused by features of its microstructure. A current-induced increase in the effective boundary length results in a decrease in the flux compression, a decrease in the effective field in the intergranular medium, and a magnetoresistance hysteresis narrowing with increasing current.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Петров, Михаил Иванович, Balaev D. A., Gokhfel'd D. M., Шайхутдинов, Кирилл Александрович, Aleksandrov K. S.
Заглавие : Temperature evolution of the hysteresis in the current-voltage characteristic of a polycrystalline high-temperature superconductor with 1-2-3 structure
Место публикации : Phys. Solid State: American Institute of Physics, 2002. - Vol. 44, Is. 7. - P.1229-1234. - ISSN 1063-7834, DOI 10.1134/1.1494614
Примечания : Cited References: 38
Предметные рубрики: WEAK LINKS
ANDREEV REFLECTIONS
SIMPLIFIED MODEL
EXCESS CURRENT
SNS JUNCTIONS
SCATTERING
COMPOSITES
TRANSPORT
Аннотация: The temperature evolution of the current-voltage (I-U) characteristic of a contact of the break-junction type with direct conduction is investigated on a polycrystalline HTSC of the Y-Ba-Cu-O system. The experimental I-U characteristics possessing a hysteresis are correctly described in the framework of the Kummel-Nicolsky theory for an S-N-S contact (S stands for a superconductor; N, for a normal metal) in which the Andreev reflection of quasiparticles from the N-S interface is considered. It is shown that the shape of the I-U curve, as well as the existence of a hysteresis, is determined by the ratio of the number of "long" and "short" intergranular boundaries in the polycrystal under investigation. The coincidence of the calculated and experimental I-U curves made it possible to estimate the effective length of "natural" intergranular boundaries in polycrystalline HTSC materials. The estimate is obtained from the experimental temperature dependence of the critical current in the sample under investigation. (C) 2002 MAIK "Nauka/Interperiodica".
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrov M. I., Balaev D. A., Ospishchev S. V., Aleksandrov K. S.
Заглавие : Transport properties of HTSC plus Ba(Pb, Met)O-3 composites as functions of the electrical and magnetic characteristics of nonsuperconducting components
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2000. - Vol. 42, Is. 5. - P.810-815. - ISSN 1063-7834, DOI 10.1134/1.1131294
Примечания : Cited References: 27
Предметные рубрики: HIGH-TEMPERATURE SUPERCONDUCTORS
CURRENT-VOLTAGE CHARACTERISTICS
NORMAL-METAL LAYER
WEAK LINKS
JUNCTIONS
SCATTERING
BAPB1-XBIXO3
TRANSITION
IMPURITIES
BREAKING
Аннотация: Composites simulating a network of weak metallic links and consisting of a classic 1-2-3 HTSC and a BaPbO3 metal oxide with incorporated Sn, Ni, and Fe impurities have been prepared. Experimental resistivity, magnetic, and Mossbauer studies of the BaPb(0.9)Met(0.1)O(3) nonsuperconducting components are presented. The transport properties of the HTSC + BaPb(0.9)Met(0.1)O(3) composites have been investigated. The superconducting properties of the composites are observed to be suppressed, both when the carrier mean free path in nonsuperconducting components with tin impurities decreases, and as a result of an additional interaction of the magnetic moments of (Fe, Ni) impurities with the spins of supercurrent carriers. The experimental temperature dependences of the composite critical current are analyzed in terms of the de Gennes theory for the superconductor-normal metal-superconductor structures. (C) 2000 MAIK "Nauka/Interperiodica".
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrov M. I., Balaev D. A., Gokhfeld D. M., Ospishchev S. V., Shaikhutdinov K. A., Aleksandrov K. S.
Заглавие : Applicability of the theory based on Andreev reflection to the description of experimental current-voltage characteristics of polycrystalline HTSC plus normal metal composites
Место публикации : Physica C. - 1999. - Vol. 314, Is. 1-2. - P.51-54. - ISSN 0921-4534, DOI 10.1016/S0921-4534(99)00151-3
Примечания : Cited References: 19
Предметные рубрики: WEAK LINKS
JUNCTIONS
FILMS
Ключевые слова (''Своб.индексиров.''): ybacuo + bapbo3 composites--network of weak s-n-s links--current-voltage characteristic
Аннотация: Measurements of current-voltage characteristics (CVC) of Y3/4Lu1/4Ba2,Cu3O7 + BaPbO3 and Y3/4Lu1/4Ba2Cu3O7 +BaPb0.9Sn0.1O3 composites modelling network of superconducting-normal metal-superconducting (S-N-S) junctions in effectively 'clean' and 'dirty' limits, respectively, have been performed. Essential difference of CVCs for these composites is observed in spite of the identical preparation technique and experimental conditions. It is shown that the theory for S-N-S junctions [R. Kummel, U. Gunsenheimer, R. Nicolsky, Phys. Rev. B, 42 (1990) 3932] well describes the experimental CVCs of the composites in both cases. (C) 1999 Published by Elsevier Science B.V. All rights reserved.
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13.

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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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Петров, Михаил Иванович, Krivomazov S. N., Khrustalev B. P., Aleksandrov K. S.
Заглавие : A study of the hysteresis property of the current voltage characteristic in high-temperature superconductors
Место публикации : Solid State Commun. - 1992. - Vol. 82, Is. 6. - P.453-456. - ISSN 0038-1098, DOI 10.1016/0038-1098(92)90748-X
Примечания : Cited References: 21
Предметные рубрики: HIGH-TC SUPERCONDUCTORS
YBA2CU3O7-X
FILMS
Аннотация: Temperature measurements of current-voltage characteristics (CVC) of the (Y, Lu)1Ba2Cu3O7-delta high-temperature superconductor have been performed. Analysis of the data shows that CVC of HTSC is mainly formed by two mechanisms: the creep of the Abrikosov vortices inside the crystallites and the Andreev reflection of the carriers within the metal character boundary between the crystallites.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrov M. I., Balaev D. A., Shaikhutdinov K. A., Aleksandrov K. S.
Заглавие : Superconductor-semiconductor-superconductor junction network in bulk polycrystalline composites Y3/4Lu1/4Ba2Cu3O7 + Cu1-xLixO
Место публикации : Superconductor Science and Technology. - 2001. - Vol. 14, Is. 9. - P.798-805. - ISSN 0953-2048, DOI 10.1088/0953-2048/14/9/333
Ключевые слова (''Своб.индексиров.''): critical current density (superconductivity)--josephson junction devices--polycrystalline materials--superconductivity--thermal effects--transport properties--superconductor junction networks--semiconductor junctions
Аннотация: Bulk Y3/4Lu1/4Ba2Cu3O7 + Cu1-xLixO composites with x = 0, 0.003 and 0.06 and varied volume content of Cu1-xLixO have been prepared. Analysis of the transport properties of the composites has shown that they can be represented as a network of superconductor-semiconductor-superconductor (S-Sm-S) weak links. The dependence of the critical current density on the normal resistance for the composites studied shows a behaviour similar to that for single Josephson junctions. The experimental temperature dependences of the critical current are qualitatively described in terms of a theory of S-Sm-S junctions that takes into account the Andreev reflection of carriers from the S-Sm and Sm-S interfaces.
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16.

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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17.

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.
Scopus
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18.

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
Scopus,
РИНЦ
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Петров, Михаил Иванович, Balaev D. A., Шайхутдинов, Кирилл Александрович, Aleksandrov K. S.
Заглавие : Influence of transport current and thermal fluctuations on the resistive properties of HTSC+CuO composites
Место публикации : Physics of the Solid State. - 1999. - Vol. 41, Is. 6. - P.881-886. - ISSN 1063-7834
Аннотация: Measurements of the temperature dependence of the electrical resistance R(T) below the superconducting transition temperature have been performed at different values of the transport current in HTSC+CuO composites modeling a network of weak S - I - S Josephson junctions (S - superconductor, I - insulator). It has been shown experimentally that the temperature dependence R(T) at different values of the transport current is adequately described by means of the mechanism of thermally activated phase slippage developed by Ambegaokar and Halperin for tunnel structures. Within the framework of this model we have numerically calculated the temperature dependence of the critical current J c(T) as defined by various criteria. Qualitative agreement obtains between the measured and calculated temperature dependences J c(T). В© 1999 American Institute of Physics.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Vasilyev A. D., Zwegintsev S. A., Петров, Михаил Иванович, Khrustalev B. P.
Заглавие : Peculiarities of the resistive state of the (Y,Lu)1Ba2Cu3O7-δ superconducting ceramics
Место публикации : Physica C. - 1988. - Vol. 156, Is. 2. - P.249-250. - ISSN 0921-4534
Ключевые слова (''Своб.индексиров.''): ceramic materials--oxides--current voltage characteristics--yttrium barium copper oxides--superconducting materials
Аннотация: The resistive state of the high-Tc superconducting ceramics (Y, Lu)1Ba2Cu3O7-δ has been investigated, a hysteresis instability has been discovered in the current-voltage characteristics (CVC) under a current density j ≈ 1.7 kA cm-2. © 1988.
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WOS
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