Библиотека института физики им. Л.В. Киренского СО РАН

Главная

Базы данных

Труды сотрудников ИФ СО РАН - результаты поиска

Вид поиска

Каталог книг и брошюр библиотеки ИФ СО РАН

Каталог журналов библиотеки ИФ СО РАН

Труды сотрудников ИФ СО РАН

Область поиска

в найденном

Формат представления найденных документов:
полный	информационный	краткий

Отсортировать найденные документы по:
автору	заглавию	году издания	типу документа

Поисковый запрос: (<.>S=SYSTEM<.>)

Общее количество найденных документов : 40
Показаны документы с 1 по 20

1-20 21-40

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Komogortsev S. V., Iskhakov R. S.
Заглавие : Magnetization curve and magnetic correlations in a nanochain of ferromagnetic grains with random anisotropy
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2005. - Vol. 47, Is. 3. - P495-501. - ISSN 1063-7834, DOI 10.1134/1.1884711
Примечания : Cited References: 31
Предметные рубрики: NANOCRYSTALLINE FERROMAGNETS
AMORPHOUS FERROMAGNETS
FIELD
MODEL
MICROSTRUCTURE
SIMULATIONS
DEPENDENCE
SYMMETRY
SYSTEM
MEDIA
Аннотация: The magnetization curve and magnetization correlation function are calculated for a ferromagnetic chain of single-domain nanoparticles with a randomly oriented anisotropy axis for different ratios between the exchange correlation and anisotropy energies. It is shown that the coercive force decreases as the exchange correlations increase. For strong exchange correlations, the magnetization curve is described by the following three successive magnetization processes as the applied field is increased: (i) nonuniform rotation of the magnetization of stochastic domains, (ii) collapse of the magnetic solitons, and (iii) nonuniform rotation of exchange-correlated magnetization vectors of the nanoparticles. For high fields, the calculated correlation function of the transverse magnetization components coincides with that predicted from linear theory. At low and zero fields, the main parameters of the correlation function (the variance and correlation radius) tend to certain finite values rather than diverge (as is the case in linear theory). The irreversible variation in the magnetization at low fields (the hysteresis loop) and the hysteresis of the main parameters of the correlation function are calculated. (c) 2005 Pleiades Publishing, Inc.
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Patrin G. S., Yakovchuk V. Y., Velikanov D. A.
Заглавие : Influence of semimetal spacer on magnetic properties in NiFe/Bi/NiFe trilayer films
Место публикации : Phys. Lett. A. - 2007. - Vol. 363, Is. 1-2. - P.164-167. - ISSN 0375-9601, DOI 10.1016/j.physleta.2006.10.088
Примечания : Cited References: 19
Предметные рубрики: BISMUTH
SYSTEM
Ключевые слова (''Своб.индексиров.''): semimetal spacer--magnetization--spin accumulation--trilayer film--magnetization--semimetal spacer--spin accumulation--trilayer film
Аннотация: The results of experimental study of magnetic properties in permalloy/bismuth/permalloy trilayer films synthesized for the first time are presented. Measurements of magnetic field and temperature dependences of magnetization have shown that the interlayer coupling depends on bismuth spacer thickness. The dependence of saturation magnetization of the system on semimetal thickness has been found. Possible mechanisms responsible for the observed features of behavior are discussed. (c) 2006 Elsevier B.V. All rights reserved.
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rotter I., Sadreev A. F.
Заглавие : Influence of branch points in the complex plane on the transmission through double quantum dots
Место публикации : Phys. Rev. E: AMER PHYSICAL SOC, 2004. - Vol. 69, Is. 6. - Ст.66201. - ISSN 1539-3755, DOI 10.1103/PhysRevE.69.066201
Примечания : Cited References: 25
Предметные рубрики: ELECTRON-ATOM SCATTERING
S-MATRIX
DOUBLE POLES
CONTINUUM
SYSTEM
MODEL
Ключевые слова (''Своб.индексиров.''): eigenvalues and eigenfunctions--hamiltonians--mathematical models--matrix algebra--probability--resonance--scattering--wave propagation--branch points--open quantum systems--propagating modes--quantum computing devices--semiconductor quantum dots
Аннотация: We consider single-channel transmission through a double quantum dot system consisting of two single dots that are connected by a wire and coupled each to one lead. The system is described in the framework of the S matrix theory by using the effective Hamiltonian of the open quantum system. It consists of the Hamiltonian of the closed system (without attached leads) and a term that accounts for the coupling of the states via the continuum of propagating modes in the leads. This model allows one to study the physical meaning of branch points in the complex plane. They are points of coalesced eigenvalues and separate the two scenarios with avoided level crossings and without any crossings in the complex plane. They influence strongly the features of transmission through double quantum dots.
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aver'yanov E. M.
Заглавие : Fluctuations of orientational order in a uniaxial nematic liquid crystal with biaxial molecules and its response to an external field
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2003. - Vol. 45, Is. 5. - P990-1001. - ISSN 1063-7834, DOI 10.1134/1.1575350
Примечания : Cited References: 30
Предметные рубрики: PHASE-TRANSITION
SMECTIC-A
PARTICLES
SYSTEM
LANDAU
MODEL
Аннотация: Homogeneous thermal fluctuations of the orientational order parameters S and G of biaxial molecules in a uniaxial nematic liquid crystal are investigated in the framework of the molecular-statistical theory. It is demonstrated that the molecular biaxiality significantly affects the order parameters S and G, their temperature dependences in the nematic phase, the amplitude and the temperature dependence of the order parameter fluctuations in the nematic and isotropic phases, and the character of the transition from the nematic phase to the isotropic liquid phase. It is established that the fluctuations of the parameters S and G in the nematic phase are related to the temperature dependences of S and G and the susceptibilities chi(S) and chi(G) of the nematic liquid crystal to external fields, which leads to a change in the parameters S and G at a fixed director orientation. Explanations are offered for the known experimental data on the orientational ordering of biaxial molecules under the action of external fields in the isotropic phase of nematic liquid crystals. (C) 2003 MAIK "Nauka/Interperiodica".
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Iskhakov R. S., Ignatchenko V. A., Komogortsev S. V., Balaev A. D.
Заглавие : Study of magnetic correlations in nanostructured ferromagnets by correlation magnetometry
Место публикации : JETP Letters. - 2003. - Vol. 78, Is. 10. - P.646-650. - ISSN 0021-3640, DOI 10.1134/1.1644310
Примечания : Cited References: 20
Предметные рубрики: AMORPHOUS FERROMAGNETS
RANDOM ANISOTROPY
NANOCRYSTALLINE
SYSTEM
RIPPLE
Аннотация: We propose a theoretically justified experimental magnetometric technique for determining the size of stochastic domains spontaneously formed in the spin system of nanostructured ferromagnets and for evaluating the effective anisotropy in these magnetically correlated regions. The method is based on monitoring the DeltaM similar to H (-2) relationship in the low-field part of the integral magnetization curve. (C) 2003 MAIK "Nauka/Interperiodica".
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Drokin N. A., Fedotova A. V., Glushchenko G. A., Churilov G. N.
Заглавие : Impedance spectroscopy of high-molecular poly(ethylene) with carbon nanotubes
Коллективы :
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2010. - Vol. 52, Is. 3. - P657-661. - ISSN 1063-7834, DOI 10.1134/S1063783410030303
Примечания : Cited References: 14. - This study was supported by the Presidium of the Russian Academy of Sciences (project no. 27.1), the Siberian Branch of the Russian Academy of Sciences (integration project no. 5), and the Council on Grants from the President of the Russian Federation (grant no. 3818.2008.3).
Предметные рубрики: RELAXATION SPECTRA
DIELECTRIC SPECTRA
SYSTEM
TIMES
Аннотация: The impedance spectra of composite materials based on the high-molecular poly(ethylene) modified by carbon nanotubes have been investigated. A numerical method has been proposed for reconstructing the relaxation time distribution function of the active (R) and reactive (C) elements of a sample directly from the experimentally obtained frequency dependence of the real and imaginary components of the impedance. It has been shown that, with an increase in the concentration of carbon nanotubes, the electrical conductivity of the samples under study increases and their impedance characteristics are described by a nonmonotonic relaxation time distribution function.
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Sadreev A. F.
Заглавие : Switching through symmetry breaking for transmission in a T-shaped photonic waveguide coupled with two identical nonlinear micro-cavities
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2011. - Vol. 23, Is. 31. - Ст.315303. - ISSN 0953-8984, DOI 10.1088/0953-8984/23/31/315303
Примечания : Cited References: 32
Предметные рубрики: MODE THEORY
NUCLEAR REACTIONS
UNIFIED THEORY
FIBER
INSTABILITIES
RESONANCE
GRATINGS
SYSTEM
STATES
Ключевые слова (''Своб.индексиров.''): all-optical switching--anti-symmetric--central waveguides--coupled mode theory--input power--input pulse--mirror symmetry--nonlinear cavities--output waveguides--photonic waveguides--standing wave--symmetry-breaking--microcavities--mirrors--waveguides--light transmission
Аннотация: Using coupled mode theory we consider transmission in a T-shaped waveguide coupled with two identical symmetrically positioned nonlinear micro-cavities with mirror symmetry. For input power injected into the central waveguide we show the existence of a symmetry breaking solution which is a result of mixing of the symmetrical input wave with an antisymmetric standing wave in the Fabry-Perot interferometer. With growth of the input power, a feature in the form of loops arises in the solution which originates from bistability in the transmission in the output left/right waveguide coupled with the first/second nonlinear cavity. The domains of stability of the solution are found. The breaking of mirror symmetry gives rise to nonsymmetrical left and right outputs. We demonstrate that 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.
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Abramova G. M., Petrakovskii G. A., Bayukov O. A., Varnek V. A., Sokolov V. V., Bovina A. F.
Заглавие : Mossbauer studies of FexMn1-xS single crystals
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2008. - Vol. 50, Is. 2. - P237-240. - ISSN 1063-7834, DOI 10.1134/S1063783408020042
Примечания : Cited References: 16
Предметные рубрики: METAL-INSULATOR-TRANSITION
MAGNETIC-PROPERTIES
ALPHA-MNS
SULFIDES
MAGNETORESISTANCE
PRESSURE
SYSTEM
OXIDES
Аннотация: Single crystals of iron manganese sulfides FexMn1-xS (0.25
WOS,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Komogortsev S. V., Iskhakov R. S., Balaev A. D., Kudashov A. G., Okotrub A. V., Smirnov S. I.
Заглавие : Magnetic properties of Fe3C ferromagnetic nanoparticles encapsulated in carbon nanotubes
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2007. - Vol. 49, Is. 4. - P734-738. - ISSN 1063-7834, DOI 10.1134/S1063783407040233
Примечания : Cited References: 15
Предметные рубрики: IRON NANOPARTICLES
EXCHANGE
SYSTEM
Аннотация: The low-temperature dependences of magnetic characteristics (namely, the coercive force H (c) , the remanent magnetization M (r) , local magnetic anisotropy fields H (a), and the saturation magnetization M (s) ) determined from the irreversible and reversible parts of the magnetization curves for Fe3C ferromagnetic nanoparticles encapsulated in carbon nanotubes are investigated experimentally. The behavior of the temperature dependences of the coercive force H (c) (T) and the remanent magnetization M (r) (T) indicates a single-domain structure of the particles under study and makes it possible to estimate their blocking temperature T (B) = 420-450 K. It is found that the saturation magnetization M (s) and the local magnetic anisotropy field H-a vary with temperature as similar to T-5/2.
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrov M. I., Balaev D. A., Gokhfel'd Yu. S., Dubrovskii A. A., Shaikhutdinov K. A.
Заглавие : Effect of heterovalent substitution of rare-earth elements on the magnetic and transport properties of YBa2Cu3O7
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2007. - Vol. 49, Is. 11. - P2047-2051. - ISSN 1063-7834, DOI 10.1134/S1063783407110054
Примечания : Cited References: 18
Предметные рубрики: PR
SUPERCONDUCTIVITY
CE
ND
TRANSITION
SYSTEM
LA
Аннотация: The Y(1-x) Ce (x) Ba2Cu3O7 system with low cerium concentrations has been synthesized. The cerium solubility limit measured using x-ray powder diffraction analysis is about 2.4 at. %. The temperature dependences of the magnetization M(T) are measured for samples cooled in a magnetic field (FC) and in a zero field (ZFC). The difference between the magnetizations M-ZFC-M-FC at 77.4 K, which is proportional to the pinning potential, passes through a maximum at x = 0.0156. This concentration corresponds to the average distance (equal to eight lattice constants) between the impurity ions in the plane of the rare-earth elements, which is comparable to the diameter of Abrikosov vortices in YBa2Cu3O7.
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorev M. V., Flerov I. N., Sciau P., Guillemet-Fritsch S.
Заглавие : Thermal expansion of (Ba1-x La (x) )Ti1-x/4O3 solid solutions
Коллективы : Russian Foundation for Basic Research [07-02-00069]; Russian Federation [NSh-1011.2008.2]
Разночтения заглавия :авие SCOPUS: Thermal expansion of (Ba1 - X la x )Ti 1 - X/4O3 solid solutions
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2009. - Vol. 51, Is. 4. - P790-796. - ISSN 1063-7834, DOI 10.1134/S106378340904026X
Примечания : Cited References: 22. - This work was supported by the Russian Foundation for Basic Research (project no. 07-02-00069) and the Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools of the Russian Federation (grant NSh-1011.2008.2).
Предметные рубрики: CERAMICS
BATIO3
BA(TI1-XZRX)O-3
FERROELECTRICS
CONDUCTIVITY
BEHAVIOR
SYSTEM
PHASE
HEAT
Аннотация: Deformation and the thermal expansion coefficient of ceramic samples of (Ba1 - x La (x) )Ti1 - x/4O3 solid solutions (x = 0, 0.026, 0.036, 0.054) were studied in the temperature range 120-700 K. Based on an analysis of the data obtained, the temperature-composition phase diagram is refined, and the temperature dependence of the polarization is calculated. The results are discussed in combination with the dielectric measurement data.
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kolovsky A. R.
Заглавие : Regular and chaotic dynamics of a molecule affected by an external resonance field
Место публикации : Phys. Lett. A. - 1991. - Vol. 157, Is. 8-9. - P.474-480. - ISSN 0375-9601, DOI 10.1016/0375-9601(91)91022-6
Примечания : Cited References: 16
Предметные рубрики: QUANTAL VERSION
OVERLAP
SYSTEM
Аннотация: The behavior of a molecule affected by a strong external field is discussed. The analysis is performed using a two-level approximation. This approximation will be valid, for example, for a diatomic molecule acted upon by IR radiation if the energy of interaction between the external field and the molecule is less than the anharmonicity of the vibrational spectrum. It is shown that in the case of modulation of the external field the molecule's dynamics is chaotic. We compare this situation to the case of the unmodulated field where the dynamics is regular.
WOS
Найти похожие

13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zeer E. P., Falaleev O. V., Ivanov Y. N., Petrakovskaya E. A.
Заглавие : Study of molecular mobility in ABF6-center-dot-6H2O crystal family
Место публикации : Fiz. Tverd. Tela. - 1994. - Vol. 36, Is. 8. - P.2210-2220. - ISSN 0367-3294
Примечания : Cited References: 21
Предметные рубрики: PHASE-TRANSITIONS
NMR
SYSTEM
WOS
Найти похожие

14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Altunin R. R., Moiseenko E. T., Zharkov S. M.
Заглавие : Structural phase transformations in Al/Pt bilayer thin films during the solid-state reaction
Коллективы : Russian Foundation for Basic Research [16-33-00475 mol_a]
Место публикации : Phys. Solid State. - 2018. - Vol. 60, Is. 7. - P.1413-1418. - ISSN 1063-7834, DOI 10.1134/S106378341807003X. - ISSN 1090-6460(eISSN)
Примечания : Cited References: 26. - This study was supported by the Russian Foundation for Basic Research, project no. 16-33-00475 mol_a.
Предметные рубрики: AL
SYSTEM
MULTILAYERS
ALUMINUM
HEAT
Аннотация: A sequence of phases forming during the solid-phase reaction in Al/Pt bilayer thin films has been investigated by in situ electron diffraction. It is shown that the amorphous PtAl2 phase forms first during the solid-phase reaction initiated by heating. Upon further heating, PtAl2, Pt2Al3, PtAl, and Pt3Al crystalline phases sequentially form, which is qualitatively consistent with an effective formation heat model. The content of phases forming during the reaction has been quantitatively analyzed and the structural phase transformations have been examined.
Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Найти похожие

15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivanov A. A., Orlov V. A.
Заглавие : Self-organization of the magnetization in ferromagnetic nanowires
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Институт физики им. Л.В. Киренского Сибирского отделения РАН , RFBR [14-02-00238-a]
Место публикации : J. Magn. Magn. Mater.: Elsevier Science, 2017. - Vol. 440. - P.217-220. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2016.12.053. - ISSN 1873-4766(eISSN)
Примечания : Cited References:21. - This study was supported by RFBR, Project no. 14-02-00238-a
Предметные рубрики: SYSTEM
ANISOTROPY
Ключевые слова (''Своб.индексиров.''): domain wall--nanowire--magnetic inhomogeneities--stochastic domains
Аннотация: In this work we demonstrate the occurrence of the characteristic spatial scale in the distribution of magnetization unrelated to the domain wall or crystallite size with using computer simulation of magnetization in a polycrystalline ferromagnetic nanowire. This is the stochastic domain size. We show that this length is included in the spectral density of the pinning force of domain wall on inhomogeneities of the crystallographic anisotropy. The constant and distribution of easy axes directions of the effective anisotropy of stochastic domain, are analytically calculated.
Смотреть статью,
WOS,
Читать в сети ИФ
Найти похожие

16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrova I. P., Bartolome J., Falvello L. R., Torres J. M., Sukhovskii A. A.
Заглавие : Effect of impurities on the successive phase transitions in (Cs1-xRbx)(2)ZnI4 compounds
Разночтения заглавия :авие SCOPUS: Effect of impurities on the successive phase transitions in (Cs1-xRbx)2ZnI4 compounds
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2002. - Vol. 14, Is. 49. - P.13623-13634. - ISSN 0953-8984, DOI 10.1088/0953-8984/14/49/316
Примечания : Cited References: 27
Предметные рубрики: X-RAY
CS2ZNI4
SYSTEM
HEAT
Ключевые слова (''Своб.индексиров.''): phase transitions--point defects--specific heat--temperature--x ray diffraction analysis--zinc compounds--lock-in transition--nuclear quadrupole resonance--single crystals
Аннотация: The heat capacity, nuclear quadrupole resonance (NQR) and x-ray diffraction of (Cs1-xRbx)(2)ZnI4 single crystals have been measured, for x = 0, 0.001, 0.005, 0.01, 0.025 and 0.05. The normal to incommensurate (N-Inc) phase transition at T-I, the incommensurate to commensurate (Inc-C) lock-in transition at T-L and the structural commensurate monoclinic to triclinic transition at T-LT, observed in the parent compound (x = 0), takes place for x = 0, 0.001, 0.005 and 0.01. For x = 0.025 only T-I and T-L are detected, while for x = 0.05 no transitions were observable. The values of T-I and T-L increase with x while T-LT decreases and disappears at the concentration x = 0.025. The effect of defects, besides modifying the transition temperatures, is that of broadening and lowering the heat capacity anomaly at the lock-in transition until its total quenching for x = 0.05. No observable hysteresis is detected in this transition. NQR and x-ray diffraction data show the Inc-C transition up to the highest concentration. We conclude that this phenomenology is caused by weak interaction of the incommensurate modulation with point defects even in the region close to the Inc-C transition.
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shaikhutdinov K. A., Balaev D. A., Popkov S. I., Petrov M. I.
Заглавие : Transport and magnetic properties of Y3/4Lu1/4Ba2Cu3O7+Y3Fe5O12 composites representing a Josephson-type superconductor-ferrimagnet-superconductor weak-link network
Разночтения заглавия :авие SCOPUS: Transport and Magnetic Properties of Y3/4Lu1/4Ba 2Cu3O7 + Y3Fe5O 12 Composites Representing a Josephson-Type Superconductor-Ferrimagnet-Superconductor Weak-Link Network
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2003. - Vol. 45, Is. 10. - P1866-1873. - ISSN 1063-7834, DOI 10.1134/1.1620087
Примечания : Cited References: 36
Предметные рубрики: RESISTIVE PROPERTIES
JUNCTION NETWORK
SYSTEM
TRANSITION
CURRENTS
VOLTAGE
STATE
FIELD
Аннотация: Y3/4Lu1/4Ba2Cu3O7 + Y3Fe5O12 composites with different volume ratios of the starting components were synthesized. The composites model an S-F-S Josephson junction network, where S stands for a superconductor and F, for a ferrimagnet. A study of the transport characteristics of the composites revealed that the temperature behavior of the electrical resistivity rho(T) below the superconducting transition point T-C is different in two regions separated by a temperature T-m. Below T-m, the current-voltage characteristics of the composites are nonlinear, while in the interval from T-C to T-m the values of rho(T) do not depend on the transport current j and magnetic field H. This behavior of rho(T, j ) and rho(T, H) is assigned to specific features of the tunneling of superconducting carriers through the ferrimagnetic layers separating HTSC grains in the composite. Magnetic measurements showed the diamagnetic response of HTSC grains to be lower in composites with a ferrimagnet. (C) 2003 MAIK "Nauka / Interperiodica".
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Gohfeld D. M., Popkov S. I., Saihutdinov K. A., Petrov M. I.
Заглавие : High-temperature superconductor based composites: Large magnetoresistance in weak magnetic fields
Место публикации : Tech. Phys. Lett.: AMER INST PHYSICS, 2001. - Vol. 27, Is. 11. - P952-955. - ISSN 1063-7850, DOI 10.1134/1.1424404
Примечания : Cited References: 16
Предметные рубрики: CRITICAL CURRENTS
APPLICABILITY
TRANSITION
TRANSPORT
SYSTEM
CUO
Аннотация: It was found that high-temperature superconductor (HTSC) based composites of the 1-2-3 (YBCO) + dielectric and YBCO + normal metal types exhibit large magnetoresistances in weak magnetic fields in a broad temperature range. This behavior is qualitatively explained using the concept of the irreversibility line in HTSCs and the mechanism of thermal fluctuations in the network of weak bonds of the Josephson type realized in HTSC composites. The HTSC-based composites exhibit a much higher sensitivity (as compared to that in the usual HTSC ceramics) to weak magnetic fields (below 300 Oe) at liquid-nitrogen temperatures, which is important for practical applications. (C) 2001 MAIK "Nauka /Interperiodica".
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Popkov S. I., Shaikhutdinov K. A., Petrov M. I.
Заглавие : Mechanisms of dissipation in a Josephson medium based on a high-temperature superconductor in a magnetic field
Разночтения заглавия :авие SCOPUS: Mechanisms of dissipation in a josephson medium based on a high-temperature superconductor in a magnetic field
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2006. - Vol. 48, Is. 5. - P826-832. - ISSN 1063-7834, DOI 10.1134/S1063783406050039
Примечания : Cited References: 32
Предметные рубрики: RESISTIVE TRANSITION
PHASE-SLIP
TRANSPORT-PROPERTIES
MAGNETORESISTANCE
SYSTEM
MODEL
YBA2CU3O7-X
PENETRATION
COMPOSITES
HYSTERESIS
Аннотация: This paper reports on the results of an investigation into the influence of magnetic fields (0-60 kOe) on the temperature dependences of the electrical resistance R(T) of the Y3/4Lu1/4Ba2Cu3O7 + CuO composites. The structure of these composites is considered to be a network of tunnel-type Josephson junctions in which a nonsuperconducting component (CuO) forms boundaries (barriers) between high-temperature superconducting crystallites. The temperature dependence R(T) of the composites has two steps characteristic of granular superconductors: (i) an abrupt change in the electrical resistance at the critical temperature of high-temperature superconducting crystallites and (ii) a smooth transition to the superconducting state under the influence of the boundaries between the crystallites. The experimental dependences R(T) are analyzed within the Ambegaokar-Halperin model of thermal fluctuations in Josephson junctions and the flux creep model. An increase in the magnetic field leads to a crossover from the Ambegaokar-Halperin mechanism to the flux creep mechanism. The temperature dependences R(T) in the range of weak magnetic fields (from 0 to 10(2) Oe) are adequately described by the relationship following from the Ambegaokar-Halperin model. In the range of strong magnetic fields (from 10(3) to 6 x 10(4) Oe), the dissipation obeys the Arrhenius law R similar to exp(-U(H)/T)], which is characteristic of the flux creep model with a temperature-independent pinning energy U(H). The effective Josephson coupling energies and the pinning energies corresponding to the Ambegaokar-Halperin and flux creep mechanisms are determined.
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Alekseev K. N., Berman G. P., Campbell D. K.
Заглавие : Strange attractor in resonant tunneling
Место публикации : Phys. Rev. B: AMERICAN PHYSICAL SOC, 1998. - Vol. 58, Is. 7. - P3954-3962. - ISSN 0163-1829, DOI 10.1103/PhysRevB.58.3954
Примечания : Cited References: 38
Предметные рубрики: INTRINSIC BISTABILITY
RING CAVITY
OPTICAL TURBULENCE
TRANSMITTED LIGHT
QUANTUM-WELLS
OSCILLATIONS
BARRIERS
SYSTEM
STATE
TIME
Аннотация: We consider the process of resonant electron tunneling through a double-barrier potential, taking into account nonlinear dynamical effects generated by charge accumulation in the interbarrier space. We use the perturbation approach of Davydov and Ermakov, which was developed for investigating intrinsic bistability in resonant tunneling. For incoming electron flow, which is modulated slowly in time, we show that the resulting nonlinear dynamics can become chaotic, with the chaos described (because of the open nature of the system) by a strange attractor. We determine the conditions for the existence of this strange attractor and estimate characteristic experimental parameters for its observation.
WOS,
Читать в сети ИФ
Найти похожие