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Specific features in the hysteretic behavior of the magnetoresistance of granular high-temperature superconductors / D. A. Balaev [et al.] // Phys. Solid State. - 2012. - Vol. 54, Is. 11. - P. 2155-2164, DOI 10.1134/S1063783412110030. - 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). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
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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Публикация на русском языке Особенности гистерезисного поведения магнитосопротивления гранулярных ВТСП [Текст] / Д. А. Балаев [и др.] // Физ. тверд. тела : Наука, 2012. - Т. 54 Вып. 11. - С. 2027-2035

Держатели документа:
[Balaev, D. A.
Dubrovskii, A. A.
Popkov, S. I.
Gokhfeld, D. M.
Semenov, S. V.
Shaykhutdinov, K. A.
Petrov, M. I.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Dubrovskii, A. A.; Дубровский, Андрей Александрович; Popkov, S. I.; Попков, Сергей Иванович; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Semenov, S. V.; Семёнов, Сергей Васильевич; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Petrov, M. I.; Петров, Михаил Иванович
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Mankov, Y. I.
Electromagnetic waves with a negative group velocity in a randomly inhomogeneous Josephson junction / Y. I. Mankov // Phys. Solid State. - 2013. - Vol. 55, Is. 5. - P. 924-929, DOI 10.1134/S1063783413050223 . - ISSN 1063-7834
Аннотация: Electromagnetic waves in a randomly inhomogeneous Josephson junction have been investigated by the averaged Green's function method for a nonmonotonic decay of the correlations of inhomogeneities. Modifications of the spectrum and the decay of these excitations caused by spatial fluctuations of the critical current of the Josephson junction have been studied. The regions of the values of the frequency, the wave number, and the stochastic parameters of the medium, at which the waves have a negative group velocity, have been determined. В© 2013 Pleiades Publishing, Ltd.

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Публикация на русском языке Маньков, Юрий Иннокентьевич. Электромагнитные волны с отрицательной групповой скоростью в случайно-неоднородном джозефсоновском переходе / Ю. И. Маньков // Физика твердого тела. - 2013. - Т. 55, Вып. 5. - С. 850-854

Доп.точки доступа:
Маньков, Юрий Иннокентьевич
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Маньков, Юрий Иннокентьевич.
Электромагнитные волны с отрицательной групповой скоростью в случайно-неоднородном джозефсоновском переходе / Ю. И. Маньков // Физ. тверд. тела. - 2013. - Т. 55, Вып. 5. - С. 850-854
Аннотация: Методом усредненных функций Грина исследованы электромагнитные волны в случайно-неоднородном джозефсоновском переходе при немонотонном спаде корреляций неоднородностей. Изучены модификация спектра и затухание этих возбуждений, обусловленные пространственными флуктуациями критического тока джозефсоновского перехода. Определены области значений частоты, волнового числа и стохастических параметров среды, при которых волны имеют отрицательную групповую скорость.

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Переводная версия Electromagnetic waves with a negative group velocity in a randomly inhomogeneous Josephson junction. - [Б. м. : б. и.]

Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Man'kov, Yu.I.
}
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Bulgakov, E. N.
Ligth-induced breaking of symmetry in photonic crystal waveguides with nonlinear defects as a key for all-optical switching circuits / E. N. Bulgakov, A. F. Sadreev, K. N. Pichugin // Spontaneous symmetry breaking, self-trapping, and Josephson oscillations. - 2013. - P. 89-124. - (Progress in optical science and photonics ; Vol. 1), DOI 10.1007/10091_2011_1 . - ISSN 978-3-642
Аннотация: We consider light transmission in 2D photonic crystal waveguide coupled with two identical nonlinear defects positioned symmetrically aside the waveguide. We show that with growth of injected light power there is a breaking of symmetry by two ways. In the first way the symmetry is broken because of different light intensities at the defects. In the second way the intensities at the defects are equaled but phases of complex amplitudes are different. That results in a vortical power flow between the defects similar to the DC Josephson effect if the input power over the waveguide is applied and the defects are coupled. As application of these phenomena we consider the symmetry breaking for the light transmission in a T-shaped photonic waveguide with two nonlinear defects. We demonstrate as this phenomenon can be explored for all-optical switching of light transmission from the left output waveguide to the right one by application of input pulses. Finally we consider the symmetry breaking in the waveguide coupled with single defect presented however by two dipole modes.

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Доп.точки доступа:
Malomed, Boris A. \ed.\; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Pichugin, K. N.; Пичугин, Константин Николаевич; Булгаков, Евгений Николаевич
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Ba0.6K0.4BiO3 single crystal as a multiple Josephson system: New coherent effect? / L. N. Zherikhina [et al.] // Journal of Physics: Conference Series. - 2012. - Vol. 400, Pt. 2. - Ст. 022146. - P. , DOI 10.1088/1742-6596/400/2/022146 . - ISSN 1742-6588
Кл.слова (ненормированные):
Antiphase -- Coherent effect -- Electric transport -- High-T -- Inhomogeneous superconductors -- Josephson -- Josephson junctions -- Josephson tunneling -- Non-linear I-V -- Polycrystalline samples -- Superconducting gaps -- Superconducting state -- Low temperature effects -- Low temperature engineering -- Magnetic fields -- Superconductivity -- Single crystals
Аннотация: The existence of space inhomogeneous superconductor insulator state (SISIS) found out earlier in polycrystalline samples of high-Tc system Ba0.6K0.4BiO3 (Tc?30 K) is confirmed on Ba0.6K0.4BiO3 single crystal. At T* (T*<Tc, T*?17 K) the transition from the homogeneous superconducting state into the SISIS occurs. SISIS is characterized by the appearance of two gapes on the Fermi surface: semi- and superconducting, that are modulated in space in antiphase, the electric transport between superconducting regions being carried out due to Josephson tunneling. Thus the whole sample becomes a multiple Josephson system. Nonlinear I-V curves, depended on temperature and magnetic field, that are typical to a Josephson system, are observed on Ba0.6K0.4BiO3 single crystal at temperatures below T*. Besides, a step like peculiarity at the values of voltage of the order of one and two superconducting gaps shows up. These peculiarities are suppressed by magnetic field much earlier then critical current. Perhaps the last phenomenon is the consequence of "coherent" state of several successive Josephson junctions, appeared in the exfoliation state. В© Published under licence by IOP Publishing Ltd.

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Доп.точки доступа:
Zherikhina, L. N.; Tskhovrebov, A. M.; Klinkova, L. A.; Balaev, D. A.; Балаев, Дмитрий Александрович; Popkov, S. I.; Попков, Сергей Иванович; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; International Conference on Low Temperature Physics(26 ; 2011 ; Aug. ; 1-17 ; Beijing, China)
}
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Balaev, D. A.
Correlation between magnetoresistance and magnetization hysteresis in a granular high-T C superconductor: Impact of flux compression in the intergrain medium / D. A. Balaev, S. V. Semenov, M. I. Petrov // J. Supercond. Nov. Magn. - 2014. - Vol. 27, Is. 6. - P. 1425-1429, DOI 10.1007/s10948-014-2491-6. - Cited References: 27 . - ISSN 1557-1939. - ISSN 1557-1947

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTOR
   JOSEPHSON MEDIUM
   CRITICAL-STATE
   YBA2CU3O7-DELTA
   FIELDS
   BEHAVIOR
   HTSC
   COMPOSITES
   RESISTANCE
   MOTION
Кл.слова (ненормированные):
Granular superconductor -- Josephson medium -- Effective field -- Magnetoresistance -- Magnetization hysteresis
Аннотация: The correlation between experimental magnetic field dependences of magnetoresistance and magnetization hysteresis in granular YBa2Cu3O7 is established. Within the proposed approach, magnetoresistance is assumed to be determined by the effective field in the intergrain boundaries the ensemble of which is considered to be a Josephson medium. The effective field in the intergrain medium can be written in the form B (eff)(H)=H-4 pi M(H)x alpha, where alpha is the parameter of averaged demagnetizing factors of grains and the degree of flux compression. A comparison of experimental magnetoresistance R(H) and magnetization M(H) hysteresis dependences obtained at different external magnetic field sweep rates yields the value alpha similar to 10, which is caused by the flux compression between grains. The proposed model describes well most of the features of the magnetoresistance hysteresis in granular high-T (C) superconductors.

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Доп.точки доступа:
Semenov, S. V.; Семёнов, Сергей Васильевич; Petrov, M. I.; Петров, Михаил Иванович; Балаев, Дмитрий Александрович
}
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Magnetoresistance of porous polycrystalline HTSC: Effect of the transport current on magnetic flux compression in intergranular medium / D. A. Balaev [et al.] // Phys. Solid State. - 2014. - Vol. 56, Is. 8. - P. 1542-1547, DOI 10.1134/S1063783414080034. - Cited References: 47 . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
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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Публикация на русском языке Магнитосопротивление пористого поликристаллического ВТСП: влияние транспортного тока на сжатие магнитного потока [Текст] / Д. А. Балаев [и др.] // Физ. тверд. тела. - 2014. - Т. 56 Вып. 8. - С. 1492-1497

Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660074, Russia

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Popkov, S. I.; Попков, Сергей Иванович; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Petrov, M. I.; Петров, Михаил Иванович; Gokhfeld, D. M.; Гохфельд, Денис Михайлович
}
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Superconductor-semiconductor-superconductor junction network in bulk polycrystalline composites Y3/4Lu1/4Ba2Cu3O7 + Cu1-xLixO / M. I. Petrov [et al.] // Superconductor Science and Technology. - 2001. - Vol. 14, Is. 9. - P. 798-805, DOI 10.1088/0953-2048/14/9/333 . - ISSN 0953-2048
Кл.слова (ненормированные):
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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Доп.точки доступа:
Petrov, M. I.; Петров, Михаил Иванович; Balaev, D. A.; Балаев, Дмитрий Александрович; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Aleksandrov, K. S.; Александров, Кирилл Сергеевич
}
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A comparative study of transport properties of composites HTSC+MgTiO3 and HTSC + NiTiO3. The effect of paramagnetic NiTiO3 / M. I. Petrov, D. A. Balaev, K. A. Shaikhutdinov, K. S. Aleksandrov // Physica C-Superconductivity and its Applications. - 2000. - Vol. 341-348, Pt. 3. - P. 1863-1864, DOI 10.1016/S0921-4534(00)01217-X . - ISSN 0921-4534
Кл.слова (ненормированные):
Composite materials -- Copper oxides -- Josephson junction devices -- Magnesium compounds -- Nickel compounds -- Paramagnetism -- Superconductivity -- Thermal effects -- Transport properties -- Yttrium compounds -- Abrikosov vortices flow -- Superconductor insulator superconductor junction -- Thermally activated phase slippage -- High temperature superconductors
Аннотация: Bulk composites Y3/4Lu1/4Ba2Cu3O7+NiTiO3 and Y3/4Lu1/4Ba2Cu3O7+MgTiO3 with insulator volume content 7.5% and 15% modelling a network of Superconductor-Insulator-Superconductor (S-I-S) junctions have been prepared. The ?(T) dependences of composites HTSC+MgTiO3 are described well by the mechanism of Thermally Activated Phase Slippage (TAPS). The anomalous behavior of resistivity ?(T) of HTSC+NiTiO3 composites manifesting as a kink on ?(T) curves at some temperature Tm have been observed. In the temperature range Tm < T < TC the dissipation is Ohmic while below Tm the CVCs are strongly non-linear. This peculiarity is interpreted as arisen owing to Abrikosov vortices flow.

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Доп.точки доступа:
Petrov, M. I.; Петров, Михаил Иванович; Balaev, D. A.; Балаев, Дмитрий Александрович; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; International conference on materials and mechanisms of superconductivity high temperature superconductors(6 ; 2000 ; Feb. ; 20-25 ; Houston, Texas, USA)
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10.

    Val'kov, V. V.
    Andreev bound states and the Josephson current through a spin dimeric structur / V. V. Val'kov, S. V. Aksenov // Spin Waves 2015, Int. Symp. : abstracts. - СПб., 2015. - P. 126
   Перевод заглавия: Андреевские связанные состояния и джозефсоновский ток через спин-димерную структуру

Материалы конференции

Доп.точки доступа:
Aksenov, S. V.; Аксенов, Сергей Владимирович; Вальков, Валерий Владимирович; "Spin Waves", International Simposium(2015 ; Jun. ; 7-13 ; Saint Petersburg); Физико-технический институт им. А.Ф. Иоффе РАН
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11.

    Val'kov, V. V.
    Effect of spin-flip processes on the Josephson current through a layer containing spin dimers / V. V. Val'kov, S. V. Aksenov // Int. conf. "Spin physics, spin chem., and spin technol.". - 2015. - P. 44. - Библиогр.: 3 назв.
   Перевод заглавия: Влияние спин-флип процессов на джозефсоновский ток через прослойку спиновых димеров

Материалы конференции

Доп.точки доступа:
Aksenov, S. V.; Аксенов, Сергей Владимирович; Вальков, Валерий Владимирович; "Spin physics, spin chemistry, and spin technology", Internnational conference(2015 ; jun. ; 1-5 ; Saint Peterburg); Физико-технический институт им. А.Ф. Иоффе РАН; Казанский физико-технический институт им. Е. К. Завойского Казанского научного центра РАН"Инно-мир", центр межрегионального инновационного развития
}
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12.

Compression of a magnetic flux in the intergrain medium of a YBa2Cu3O7 granular superconductor from magnetic and magnetoresistive measurements / D. A. Balaev [et al.] // J. Appl. Phys. - 2011. - Vol. 110, Is. 9. - Ст. 93918, DOI 10.1063/1.3657775. - Cited References: 21. - We thank V. V. Val'kov and A. D. Balaev for useful discussions of the results and I. Nemtsev for microscopic study of the samples. The study was supported by the Program of the Russian Academy of Sciences No. 5, Project No. 7. . - ISSN 0021-8979

РУБ Physics, Applied
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTORS
   CRITICAL-CURRENT-DENSITY
   CRITICAL-STATE MODEL
   CRITICAL CURRENTS
   JOSEPHSON MEDIUM
   FIELD
   TRANSITION
Кл.слова (ненормированные):
Effective field -- External fields -- Field dependence -- Field induced -- Granular superconductors -- Inter-grain -- Josephson -- Magnetoresistive -- Space between -- Superconducting grains -- Transport currents -- Electric resistance -- Magnetic flux -- Magnetic moments -- Superconductivity -- Superconducting materials
Аннотация: A method to determine a value of the effective field in the intergrain medium of a granular superconductor is proposed. The space between superconducting grains is considered to be a Josephson medium where passage of the transport current causes dissipation and the effective field is superposition of external field H and the field induced by magnetic moments of superconducting grains. The method proposed is based on the comparison of hysteresis field dependences of magnetoresistance and magnetization and their relaxation at H=const. By the example of granular YBa2Cu3O7, it is shown that, in the region of weak fields, the effective field in the intergrain medium exceeds by far the external field, i.e., compression of a magnetic flux occurs. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3657775]

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Держатели документа:
[Balaev, D. A.
Popkov, S. I.
Semenov, S. V.
Shaykhutdinov, K. A.
Shabanov, A. V.
Petrov, M. I.] Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
[Balaev, D. A.
Sabitova, E. I.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Popkov, S. I.; Попков, Сергей Иванович; Sabitova, E. I.; Semenov, S. V.; Семенов, Сергей Васильевич; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Shabanov, A. V.; Шабанов, Александр Васильевич; Petrov, M. I.; Петров, Михаил Иванович
}
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13.

Mankov, Yu. I.
Electromagnetic waves in a randomly inhomogeneous Josephson junction / Y. I. Mankov // Tech. Phys. - 2011. - Vol. 56, Is. 8. - P. 1147-1157, DOI 10.1134/S1063784211080172. - Cited References: 23 . - ISSN 1063-7842

РУБ Physics, Applied
Рубрики:
DYNAMICS
Аннотация: Spectrum modification and damping of Josephson plasma waves induced by random inhomogeneities of the critical current through the superconductor contact and the averaged Green function of such excitations are analyzed. In the self-consistent approximation that makes it possible to take into account multiple wave scattering on the inhomogeneities, the frequency and damping of averaged waves, as well as position nu (m) and peak width Delta nu of the Fourier transform imaginary part of the averaged Green function, are determined as functions of wavevector k. The evolution of such functions with the variation of the correlation radius and the relative r.m.s. fluctuations of inhomogeneities is studied. The inhomogeneity-induced wave frequency decrease observed in the long wavelength spectral region qualitatively agrees with the nu (m) behavior. It is established that in the case of "long-range" inhomogeneities, the linear dependence of damping on k changes to the inversely proportional one, and damping tends to zero as k - 0, while Delta nu at small k attains its maximal values due to nonuniform broadening. In the presence of "short-range" inhomogeneities, the wave damping and Delta nu are found to be similar functions of k. The results are compared to the numerical calculation data.

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Держатели документа:
Russian Acad Sci, Siberian Branch, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Маньков, Юрий Иннокентьевич
}
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14.

General regularities of magnetoresistive effects in the polycrystalline yttrium and bismuth high-temperature superconductor systems / D. A. Balaev [et al.] // Phys. Solid State. - 2011. - Vol. 53, Is. 5. - P. 922-932, DOI 10.1134/S1063783411050052. - Cited References: 52. - This study was supported by the Russian Academy of Sciences within the program no. 5 (project no. 7). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
HIGH MAGNETIC-FIELDS
   PHASE-SLIP
   RESISTIVE TRANSITION
   CU-O
   TRANSPORT-PROPERTIES
   JOSEPHSON MEDIUM
   MIXED-STATE
   FLUX-CREEP
   T-C
   DISSIPATION
Аннотация: The influence of thermomagnetic prehistory on the behavior of a resistive transition R(T) in external magnetic fields of polycrystalline YBa(2)Cu(3)O(7) and Bi(1.8)Pb(0.3)Sr(1.9)Ca(2)Cu(3)O (x) high-temperature supercon-ductors and the Bi(1.8)Pb(0.3)Sr(1.9)Ca(2)Cu(3)O (x) + Ag texture has been investigated. It has been found that, for YBa(2)Cu(3)O(7), the thermomagnetic prehistory exerts a substantial influence on the dissipation in the subsystem of grain boundaries in magnetic fields up to similar to 10(3) Oe, and this effect becomes insignificant in fields higher than similar to 10(4) Oe. This behavior has been explained by the influence of magnetic moments of high-temperature superconductor grains on the effective magnetic field in the intergranular medium. For bismuth high-temperature superconductors, no influence of thermomagnetic prehistory on the resistive transition has been observed; however, this effect manifests itself in current-voltage characteristics at high transport current densities. There is also a radical difference in the behavior of isotherms of the magnetoresistance R(H) for the yttrium and bismuth systems. For YBa(2)Cu(3)O(7), there is a clear separation between the dissipation regimes in the intergranular medium and in grains, which manifests itself even at low transport current densities as a change of sign in the curvature of the dependence R(H). For a texture based on the bismuth high-temperature superconductor, this feature has been observed only at high current densities (comparable to the critical current density at H = 0). This difference in the behavior of magnetoresistive properties of the classical high-temperature superconductor systems under investigation has been explained by relatively low irreversibility fields of the bismuth high-temperature superconductors. In these materials, simultaneous processes of dissipation can occur in an external magnetic field both in the subsystem of grain boundaries between crystallites and in the crystallites themselves.

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Держатели документа:
[Balaev, D. A.
Bykov, A. A.
Semenov, S. V.
Popkov, S. I.
Dubrovskii, A. A.
Shaikhutdinov, K. A.
Petrov, M. I.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Bykov, A. A.; Быков, Алексей Анатольевич; Semenov, S. V.; Семенов, Сергей Васильевич; Popkov, S. I.; Попков, Сергей Иванович; Dubrovskii, A. A.; Дубровский, Андрей Александрович; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Petrov, M. I.; Петров, Михаил Иванович
}
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15.

Altin, S.
Magnetization loops and pinning force of Bi-2212 single-crystal whiskers / S. . Altin, D. M. Gokhfeld // Physica C. - 2011. - Vol. 471, Is. 7-8. - P. 217-221, DOI 10.1016/j.physc.2011.01.006. - Cited References: 40. - The work is supported by Project No. 7 of RAS Program "Quantum physics of condensed matter", Grant No. 13 of Lavrentyev competition of young researchers of SB RAS and Scientific and Technical Research Council of Turkey (TUBITAK) under Contract No. TUBITAK-109T747. . - ISSN 0921-4534

РУБ Physics, Applied
Рубрики:
T-C SUPERCONDUCTORS
   HIGH-TEMPERATURE SUPERCONDUCTORS
   JOSEPHSON VORTICES
   GROWTH
   BI2SR2CACU2O8+DELTA
   DENSITY
   STATE
   FIELD
   MELT
Кл.слова (ненормированные):
Bi-2212 -- Whisker -- Magnetization loop -- Pinning force -- Extended critical state model -- Bi-2212 -- Extended critical state model -- Magnetization loop -- Pinning force -- Whisker -- Bi-2212 -- Extended critical state model -- Magnetization loop -- Pinning force -- Whisker -- Flux pinning -- Magnetic fields -- Magnetization -- Critical current density (superconductivity)
Аннотация: Dependence of magnetization on applied magnetic field for single-crystal Bi-2212 whiskers was measured at different temperatures. Symmetric and asymmetric magnetization loops were successfully described by the extended critical state model (the extended Valkov-Khrustalev model). Pinning force of whiskers was investigated. (C) 2011 Elsevier B.V. All rights reserved.

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Держатели документа:
[Gokhfeld, D. M.] LV Kirensky Inst Phys SB RAS, Krasnoyarsk 660036, Russia
[Altin, S.] Inonu Univ, Fen Edebiyat Fak, Fiz Bolumu, Superiletkenl Arastirma Grubu, TR-44280 Malatya, Turkey
ИФ СО РАН
Inonu Universitesi, Fen Edebiyat Fakultesi Fizik Bolumu, Superiletkenlik Arastirma Grubu, 44280 Malatya, Turkey
L.V. Kirensky Institute of Physics SB RAS, Akademgorodok 50/38, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Gokhfeld, D. M.; Гохфельд, Денис Михайлович
}
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16.

Bulgakov, E. N.
Light induced Josephson like current between two coupled nonlinear cavities coupled with a symmetrically positioned photonic crystal waveguide / E. . Bulgakov, K. . Pichugin, A. . Sadreev // J. Phys.: Condens. Matter. - 2011. - Vol. 23, Is. 6. - Ст. 65304, DOI 10.1088/0953-8984/23/6/065304. - Cited References: 26. - The work was supported by RFBR-grant 09-02-98005-'Siberia' and by RFBR-grant 11-02-00289. . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
LOCALIZED MODES
BREAKING
CIRCUITS
Кл.слова (ненормированные):
Complex amplitude -- Green function theory -- Josephson -- Kerr materials -- Light intensity -- Nonlinear cavities -- Optical cavities -- Photonic crystal waveguide -- Optical waveguides -- Photonic crystals -- Transparency -- Waveguides -- Light transmission
Аннотация: We consider light transmission in a photonic crystal waveguide coupled with two identical nonlinear cavities positioned symmetrically beside the waveguide and coupled with each other. Using Green function theory we show three scenarios for the transmission. The first one inherits the linear case in which the light transmission preserves the symmetry. In the second scenario the symmetry is broken by the light intensities at the cavities. In the third scenario the intensities are equal but the phases of the complex amplitudes are different at the cavities. This results in a Josephson like current between the cavities. The model consideration agrees well with computations of the Poynting current in a photonic crystal waveguide coupled with two optical cavities filled with a Kerr material.

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Держатели документа:
[Bulgakov, Evgeny
Pichugin, Konstantin
Sadreev, Almas] Kirensky Inst Phys, Krasnoyarsk 660036, Russia
[Bulgakov, Evgeny] Siberian State Aerosp Univ, Krasnoyarsk, Russia
ИФ СО РАН
Kirensky Institute of Physics, 660036, Krasnoyarsk, Russian Federation
Siberian State Aerospace University, Krasnoyarsk Rabochii, 31, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Pichugin, K. N.; Пичугин, Константин Николаевич; Sadreev, A. F.; Садреев, Алмаз Фаттахович
}
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17.

Nonmonotonic Behavior of Magnetoresistance, R(H) Hysteresis, and Low-Temperature Heat Capacity of the BaPb0.75Bi0.25O3 Superconductor in a Magnetic Field: Possible Manifestations of Phase Separation / D. A. Balaev [et al.] // J. Exp. Theor. Phys. - 2010. - Vol. 110, Is. 4. - P. 584-593, DOI 10.1134/S1063776110040059. - Cited References: 27. - This study was performed under the program no. 5 of the Russian Academy of Sciences (project no. 7). . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
ELECTRONIC SPECIFIC-HEAT
   BAPB1-XBIXO3 SYSTEM
   YBA2CU3O7-DELTA
   COMPOSITES
   TRANSITION
   HTSCS
   300-K
Кл.слова (ненормированные):
Diamagnetic response -- Effective field -- Heat capacities -- High-T -- Hysteretic dependence -- Josephson -- Low temperature heat capacities -- Non-monotonic dependence -- Nonmonotonic behaviors -- Polycrystalline -- Spatially inhomogeneous -- Transport currents -- Electric resistance -- Hysteresis -- Magnetic field effects -- Magnetic flux -- Magnetoelectronics -- Magnetoresistance -- Phase separation -- Semiconductor metal boundaries -- Specific heat -- Superconducting magnets -- Superconducting materials -- Superconductivity -- Transport properties -- Magnetic materials
Аннотация: The transport properties (R(T) and R(H) dependences at various values of the transport current in magnetic fields up to 65 kOe) and low-temperature heat capacity in magnetic fields up to 90 kOe of the BaPb0.75Bi0.25O3 superconductor (T-C approximate to 11.3 K) are investigated with the goal of clarifying the mechanisms determining the nonmonotonic behavior and hysteresis of its magnetoresistance R(H). The type of R(H) hysteretic dependences for BaPb0.75Bi0.25O3 is analogous to that observed in granular high-T-c superconductors (HTSCs); however, unlike classical HTSC systems, the field width of the magnetoresistance hysteresis loop for polycrystalline BaPb0.75Bi0.25O3 depends on the transport current. This means that although the mechanisms responsible for the magnetoresistance hysteresis (the influence of the magnetic flux trapped in super-conducting regions on the effective field in Josephson interlayers) are identical in these objects, the transport current in BaPb0.75Bi0.25O3 may considerably affect the diamagnetic response of the superconductor. A considerable effect of transport current on the field in which the R(H) dependences have a peak and exhibit hysterestic properties is observed. Such a behavior can be adequately interpreted using the model of the spatially inhomogeneous superconductor-insulator state proposed by Gorbatsevich et al. [JETP Lett. 52, 95 (1990)]. The nonmonotonic dependence of quantity C/T (C is the heat capacity) on the magnetic field discovered in the present study also agrees with the conclusions based on this model.

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Оригинал на русском языке Немонотонное поведение магнитосопротивления, гистерезис R(H) и низкотемпературная теплоемкость в магнитном поле сверхпроводникa BaPb0.75Bi0.25O3 возможное проявление фазового расслоения [Текст] / Д. А. Балаев [и др.] // Журнал экспериментальной и теоретической физики. - Москва : Федеральное государственное унитарное предприятие Академический научно-издательский, производственно-полиграфический и книгораспространительский центр Наука, 2010. - Т. 137 № 4. - С. 664-674

Держатели документа:
[Balaev, D. A.
Dubrovskiy, A. A.
Popkov, S. I.
Shaikhutdinov, K. A.
Petrov, M. I.] Russian Acad Sci, Siberian Branch, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Balaev, D. A.
Popkov, S. I.
Shaikhutdinov, K. A.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Mart'yanov, O. N.] Russian Acad Sci, Siberian Branch, Boreskov Inst Catalysis, Novosibirsk 630090, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russian Federation

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Popkov, S. I.; Попков, Сергей Иванович; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Mart'yanov, O. N.; Petrov, M. I.; Петров, Михаил Иванович
}
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18.

Peculiarities of the time evolution of magnetoresistance of granular HTSC in a constant applied magnetic field / D. A. Balaev [et al.] // Solid State Commun. - 2008. - Vol. 147, Is. 7-8. - P. 284-287, DOI 10.1016/j.ssc.2008.05.044. - Cited References: 17. - This work was Supported by program "Quantum macrophysics" No. 3.4 of RAS and integration project No. 3.4 of SB RAS and in part by KSF, grant 18G011. D.A.B. and A.A.D. acknowledge the Russian Science Support Foundation. . - ISSN 0038-1098

РУБ Physics, Condensed Matter
Рубрики:
CRITICAL-STATE
   SUPERCONDUCTORS
   COMPOSITES
   HYSTERESIS
   RESISTANCE
Кл.слова (ненормированные):
superconductors -- flux pinning and creep -- tunneling -- Superconductors -- Flux pinning and creep -- Tunneling -- Agricultural products -- Carbon fiber reinforced plastics -- Copper oxides -- Electric conductivity -- Electric resistance -- Evolutionary algorithms -- Ferromagnetism -- Galvanomagnetic effects -- Grain (agricultural product) -- Health -- Hysteresis -- Magnetic devices -- Magnetic field effects -- Magnetic field measurement -- Magnetic fields -- Magnetic materials -- Magnetoelectronics -- Magnetoresistance -- Semiconductor metal boundaries -- Superconducting magnets -- Superconductivity -- Yttrium barium copper oxides -- p ,p ,t measurements -- Applied (CO) -- Applied magnetic fields -- Constant magnetic field (CMF) -- Elsevier (CO) -- Evolution (CO) -- External fields -- Field induced -- Flux creep -- Hysteretic behavior -- Josephson couplings -- Low magnetic fields -- Magnetic (CE) -- Poly crystalline -- Superconducting grains -- Time evolutions -- time relaxation -- Magnetism
Аннотация: The time evolution of the magnetoresistance of bulk YBCO + CuO composites at T = 4.2 K in constant applied magnetic fields was studied to clarify the mechanism of hysteretic behavior of magnetoresistance R(H) of granular HTSC. The composites represent "model" granular HTSC with weakened Josephson coupling between superconducting (YBCO) crystallites. It was found for the first time that on the ascending branch of R(H) dependence, the resistance at H = const decreased with time while on the descending branch, the resistance increased with time in ail applied constant magnetic field. In the range of low magnetic fields (below the minimum point of the descending branch of the R(H) dependence), the resistance at H const decreased again. Similar measurements performed oil pure polycrystalline YBCO at T = 77.4 K have shown that the behavior of evolution of resistance with time is similar to that observed for the composite. This proves the peculiarity of time evolution of maignetoresistance to be a common feature of granular HTSCs. The behavior revealed is well described by the model Of granular HTSC, where the intergrain media is in an effective magnetic field which is the superposition of the external field and the field induced by superconducting grains. The time evolution of resistance reflects the time relaxation of magnetization of HTSC grains due to the intragrain flux Creep Processes. (C) 2008 Elsevier Ltd. All rights reserved.

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Держатели документа:
[Balaev, D. A.
Dubrovskiy, A. A.
Shaykhutdinov, K. A.
Popkov, S. I.
Petrov, M. I.] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Popkov, S. I.; Попков, Сергей Иванович; Petrov, M. I.; Петров, Михаил Иванович
}
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19.

Magnetic field dependence of intergrain pinning potential in bulk granular composites YBCO plus CuO demonstrating large magneto-resistive effect / D. A. Balaev [et al.] // J. Supercond. Nov. Magn. - 2008. - Vol. 21, Is. 4. - P. 243-247, DOI 10.1007/s10948-008-0324-1. - Cited References: 22 . - ISSN 1557-1939

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTORS
   ACTIVATED PHASE-SLIP
   TRANSITION
   DISSIPATION
   MECHANISM
   SENSORS
   MODEL
Кл.слова (ненормированные):
bulk granular High-T(C) superconductor -- magneto-resistive effect -- Josephson junction network -- inter-grain pinning potential -- Bulk granular High-T C superconductor -- Inter-grain pinning potential -- Josephson junction network -- Magneto-resistive effect -- Bulk composites -- Bulk granular High-T subC/sub superconductor -- Granular composites -- Inter-grain pinning potential -- Josephson junction network -- Magnetic field dependences -- Magneto-resistive effect -- Pinning potential -- Resistive effects -- Resistive transitions -- Wide temperature range -- Y-Ba-Cu-O -- Atmospheric temperature -- Barium -- Copper -- Copper oxides -- Electric resistance -- Magnetic field measurement -- Magnetic fields -- Magnetoresistance -- Magnetos -- Yttrium barium copper oxides -- Magnetic field effects
Аннотация: The broadening of the resistive transition in magnetic field and isotherms of magnetoresistance of bulk composites Y-Ba-Cu-O + CuO have been studied. These composites exhibit large magneto-resistive effect in a wide temperature range below T (C) due to weakening of Josephson coupling in this system. The broadening of the resistive transition and magnetoresistance are explained well by the Ambegaokar-Halperin (AH) model for phase slip in Josephson junctions. The magnetic field dependence of pinning potential in the intergrain boundaries deduced from AH model found out to be similar to that of critical current of an array of Josephson junctions. The values of pinning energy point out that the large magneto-resistive effect observed in the composites results from flux flow-like processes at the intergrain boundaries.

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Держатели документа:
[Balaev, D. A.
Dubrovskiy, A. A.
Popkov, S. I.
Shaykhutdinov, K. A.
Petrov, M. I.] RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics of RAS, 660036, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Popkov, S. I.; Попков, Сергей Иванович; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Petrov, M. I.; Петров, Михаил Иванович
}
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20.

Magnetoresistance hysteresis in granular HTSCs as a manifestation of the magnetic flux trapped by superconducting grains in YBCO+CuO composites / D. A. Balaev [et al.] // J. Exp. Theor. Phys. - 2007. - Vol. 105, Is. 6. - P. 1174-1183, DOI 10.1134/S1063776107120084. - Cited References: 53 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTOR
   CRITICAL-CURRENT-DENSITY
   CURRENT-VOLTAGE CHARACTERISTICS
   BA-CU-O
   TRANSPORT-PROPERTIES
   FIELD
   YBA2CU3O7-DELTA
   FLUCTUATIONS
   FINGERPRINT
   NETWORK
Кл.слова (ненормированные):
Critical currents -- Hysteresis -- Hysteresis loops -- Josephson junction devices -- Magnetic flux -- Magnetoresistance -- Yttrium barium copper oxides -- Granular superconductors -- Hysterestic dependence -- Negative magnetoresistance -- Transport current -- Composite materials
Аннотация: Hysterestic behavior of the magnetoresistance of granular HTSCs and its interaction with the magnetic hysteresis are studied by measuring magnetoresistance R(H) and critical current I-c(H) of composites formed by HTSC Y0.75Lu0.25Ba2CU3O7 and CuO. A network of Josephson junctions is formed in such composites, in which the nonsuperconducting component plays the role of barriers between HTSC grains. Hysteretic dependences R(H) of magnetoresistance are studied in a wide range of transport current density j and are analyzed in the framework of the two-level model of a granular superconductor, in which dissipation takes place in the Josephson medium and the magnetic flux can be pinned both in grains and in the Josephson medium. The interrelation between the hysteresis of critical current I-c(H) and the evolution of the hysterestic dependence R(H) of the magnetoresistance upon transport current variation is demonstrated experimentally. The effect of the magnetic past history on the hysteretic behavior of R(H) and the emergence of a segment with a negative magnetoresistance are analyzed. It is shown for the first time that the R(H) dependences are characterized by a parameter that is independent of the transport current, viz., the width of the R(H) hysteresis loop.

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Держатели документа:
[Balaev, D. A.
Gokhfeld, D. M.
Dubrovskii, A. A.
Popkov, S. I.
Shaikhutdinov, K. A.
Petrov, M. I.] Russian Acad Sci, Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Dubrovskii, A. A.; Дубровский, Андрей Александрович; Popkov, S. I.; Попков, Сергей Иванович; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Petrov, M. I.; Петров, Михаил Иванович
}
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