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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Martynov S. N.
Заглавие : Incommensurate structures in a two-subsystem partially frustrated ferrimagnet
Место публикации : JETP Letters. - 2012. - Vol. 95, Is. 4. - P.188-192. - ISSN 0021-3640, DOI 10.1134/S0021364012040066
Примечания : Cited References: 23. - This work was supported by the Russian Foundation for Basic Research (project no. 10-02-00765).
Предметные рубрики: CLASSICAL-THEORY
MAGNETIC-FIELD
ANTIFERROMAGNET
CUB2O4
STATE
Аннотация: A new incommensurate magnetic structure with a locally triangular orientation of spins has been proposed for a two-subsystem magnet with frustrated intersystem exchange and competition between exchanges in one of the subsystems. When the temperature is lowered, this structure appears from the antiferromagnetic state after a first-order phase transition. It transfers to the Yafet-Kittel triangular structure when the threshold conditions for the exchange interactions are fulfilled. An increase in the length of the frustrated exchange bonds leads to the appearance of an incommensurate phase with the local antiferromagnetic orientation of the sublattices in each subsystem between the commensurate antiferromagnetic and Yafet-Kittel phases.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Terent'ev K. Yu., Gokhfel'd D. M., Popkov S. I., Shaikhutdinov K. A., Petrov M. I.
Заглавие : Pinning in a porous high-temperature superconductor Bi2223
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 53, Is. 12. - P2409-2414. - ISSN 1063-7834, DOI 10.1134/S1063783411120250
Примечания : Cited References: 25. - This study was supported by the Ministry of Education and Science of the Russian Federation within the Russian Federal Targeted Program "Scientific and Scientific-Pedagogical Human Resources for the Innovative Russia in 2009-2013" (state contract no. NIR NK-209P) and the Krasnoyarsk Regional Foundation for Support of Research and Scientific-Technical Activities.
Предметные рубрики: II SUPERCONDUCTORS
MAGNETIC-FIELD
TRANSPORT
PHASE
TAPES
Аннотация: The current-voltage characteristics of a porous superconductor Bi(2)Sr(2)Ca(2)Cu(3)O (x) (Bi2223) have been measured at temperatures in the range from 10 to 90 K in magnetic fields of 0-80 kOe. The experimental dependences have been analyzed within the model allowing for pinning by clusters of a normal phase with fractal boundaries, as well as the model taking into account phase transformations of vortex matter. It has been found that the electrical resistance of the superconductor material significantly increases at temperatures of 60-70 K over the entire range of magnetic fields under consideration without changing in the sign of the curvature of the dependence R(I). It has been assumed that this behavior is associated with the specific feature of the pinning in a highly porous high-temperature superconductor, which lies in the fractality of the distribution of pinning centers in a wide range of self-similarity scales. The studied material at the aforementioned temperatures is characterized by the melting of the vortex structure.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fransson J., Sandalov I., Eriksson O.
Заглавие : A perfect spin-filter quantum dot system
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2004. - Vol. 16, Is. 16. - P.L249-L254. - ISSN 0953-8984, DOI 10.1088/0953-8984/16/16/L03
Примечания : Cited References: 39
Предметные рубрики: NARROW ENERGY BANDS
ELECTRON CORRELATIONS
MAGNETIC-FIELD
MAGNETOTRANSPORT
CONDUCTANCE
RESISTANCE
BARRIER
FORMULA
VALVE
LIMIT
Ключевые слова (''Своб.индексиров.''): electric potential--electron tunneling--magnetic couplings--magnetic fields--magnetic filters--transport properties--electron correlations--magnetic contacts--source-drain voltage--spin projections--semiconductor quantum dots
Аннотация: The discovery of a novel effect in the transport through a QD spin-dependently coupled to magnetic contacts is reported. For a finite range of source-drain voltages the spin projections of the current cancel exactly, resulting in a completely suppressed output current. The spin down current behaves as one normally expects whereas the spin up current becomes negative. As the source-drain voltage is increased the spin up current eventually becomes positive. Thus, tuning the source-drain voltage such that the spin up current vanishes will result in a perfect spin filter.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pichugin K. N., Sadreev A. F.
Заглавие : Aharanov-Bohm oscillations of conductance in two-dimensional rings
Место публикации : Phys. Rev. B: AMERICAN PHYSICAL SOC, 1997. - Vol. 56, Is. 15. - P9662-9673. - ISSN 0163-1829, DOI 10.1103/PhysRevB.56.9662
Примечания : Cited References: 56
Предметные рубрики: NORMAL-METAL RINGS
HALF FLUX QUANTA
MESOSCOPIC RING
MAGNETIC-FIELD
CIRCULAR BENDS
EDGE STATES
MAGNETOTRANSPORT
TRANSPORT
WIRES
TRANSITION
Аннотация: Transport properties of mesoscopic rings with applied external magnetic field are considered numerically. Rings have square and circular forms and a finite aspect ratio d/L where L is the ring size and d is the width of ring arms. The type of the Aharonov-Bohm oscillations (ABO's) of the transmission substantially depends on the number of channels participating in the electron transmission. Moreover the aspect ratio and the geometrical form of the ring are important for the ABO's. In square rings with a small aspect ratio (d/L = 1/10) the transmission displays periodic ABO's in the region of applied magnetic field defined by the inequality infinity l(B) = ((h) over bar c/eB)(1/2)greater than or equal to d, while for rings with a large aspect ratio (d/L = 1/3) only the single-channel transmission has quasiperiodical ABO's. For the circular rings with small aspect ratios the quasiperiodic ABO's are observed all over the region of the applied magnetic field while for the rings with moderate aspect ratios only the multichannel transmission displays irregular ABO's. The probability current flow patterns demonstrate fine correspondence between the transmission and the vortex structure of current distributions in the rings. For single-channel transmission, electron currents are laminar. For multichannel transport, current flow patterns display a complicated convection pattern in the form of a vortex lattice. An elementary cell of the vortex lattice consists of a few vortices and antivortices and has a size of similar to d/f, where f is the number of channels of electron transmission in the ring. Application of the flux distorts the vortex lattice enormously, partially destroying it. Correspondingly the Aharonov-Bohm oscillations of the transmission become irregular.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Prus A. G., Shaikhutdinov K. A., Petrov M. I.
Заглавие : Angular dependence of the magnetoresistance in Y3/4Lu1/4Ba2Cu3O7-CuO composites at 77 K
Разночтения заглавия :авие SCOPUS: Angular dependence of the magnetoresistance in Y3/4Lu 1/4Ba2Cu3O7-CuO composites at 77 K
Место публикации : Tech. Phys. Lett.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2006. - Vol. 32, Is. 8. - P677-679. - ISSN 1063-7850, DOI 10.1134/S1063785006080128
Примечания : Cited References: 16
Предметные рубрики: CERAMIC SUPERCONDUCTORS
MAGNETIC-FIELD
MICROSTRUCTURE
BOUNDARIES
TRANSPORT
MOTION
FILMS
Аннотация: The angular dependence of the magnetoresistance of polycrystalline Y3/4Lu1/4Ba2Cu3O7-CuO composites has been studied. These composites represent a system of Josephson junctions and exhibit a large magnetoresistance at 77 K. In addition to the isotropic component, there is the angle-dependent component proportional to sin(2)theta, where theta is the angle between the directions of current and magnetic field. This behavior is unambiguous evidence for the process of flux flow in the Josephson medium realized in the composites.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shaikhutdinov K. A., Balaev D. A., Popkov S. I., Petrov M. I.
Заглавие : Mechanism of Formation of a Negative Magnetoresistance Region in Granular High-Temperature Superconductors
Коллективы : Russian Academy of Sciences [3.4]; Russian Science Support Foundation
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2009. - Vol. 51, Is. 6. - P1105-1109. - ISSN 1063-7834, DOI 10.1134/S106378340906002X
Примечания : Cited References: 18. - This study was supported by the Russian Academy of Sciences within the program no. 3.4 (Quantum Macrophysics) and the complex integration program of the Siberian Branch of the Russian Academy of Sciences (program no. 3.4). One of the authors (D. A. B.) is grateful to the Russian Science Support Foundation.
Предметные рубрики: MAGNETIC-FIELD
CRITICAL-STATE
YBA2CU3O7-DELTA
HYSTERESIS
MICROSTRUCTURE
COMPOSITES
RESISTANCE
FLUX
Аннотация: The field dependences of the magnetoresistance of Bi(1.8)Pb(0.3)Sr(1.9)Ca(2)Cu(3)O(x) samples with different densities, which have a foam microstructure and exhibit different diamagnetic responses, were studied at 77.4 K to identify the mechanism responsible for the formation of a negative magnetoresistance region in granular high-temperature superconductors. A region with negative magnetoresistance was found to exist in samples with magnetizations highest in absolute magnitude. This behavior finds a reasonable interpretation as due to the effect exerted by dipole moments of high-temperature superconductor grains on the effective intergranular field. The strength of this effective field has been estimated.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pichugin K. N., Sadreev A. F.
Заглавие : Irregular Aharonov-Bohm oscillations in finite width rings
Место публикации : Zhurnal Eksperimentalnoi Teor. Fiz.: MEZHDUNARODNAYA KNIGA, 1996. - Vol. 109, Is. 2. - P546-561. - ISSN 0044-4510
Примечания : Cited References: 47
Предметные рубрики: HALF FLUX QUANTA
EDGE STATES
MAGNETIC-FIELD
CIRCULAR BENDS
WIRES
TRANSPORT
MAGNETOTRANSPORT
RESISTANCE
FLUCTUATIONS
CONDUCTANCE
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tambasov I. A., Tarasov A. S., Volochaev M. N., Rautskii M. V., Myagkov V. G., Bykova L. E., Zhigalov V. S., Matsynin A. A., Tambasova E. V.
Заглавие : Weak localization and size effects in thin In2O3 films prepared by autowave oxidation
Коллективы : Russian Foundation for Basic Research [16-32-00302 MOJI_a, 15-02-00948-A, 16-03-00069-A]; Council for Grants of the President of the Russian Federation [SP-317.2015.1]; Program of Foundation for Promotion of Small Enterprises in Science and Technology ("UMNIK" Program) [6662GammaY2015, 9607GammaY/2015]
Место публикации : Physica E: Elsevier Science, 2016. - Vol. 84. - P.162-167. - ISSN 1386-9477, DOI 10.1016/j.physe.2016.06.005. - ISSN 1873-1759(eISSN)
Примечания : Cited References:70. - This study was supported by the Russian Foundation for Basic Research (Grants # 16-32-00302 MOJI_a, # 15-02-00948-A, # 16-03-00069-A), by the Council for Grants of the President of the Russian Federation (SP-317.2015.1), and by the Program of Foundation for Promotion of Small Enterprises in Science and Technology (No. 6662 Gamma Y2015, 9607 Gamma Y/2015) ("UMNIK" Program). Electron microscopic studies were performed on the equipment of CCU KSC SB RAS.
Предметные рубрики: SOLID-STATE SYNTHESIS
INDIUM TIN OXIDE
DOPED ZNO FILMS
OPTICAL-PROPERTIES
MAGNETIC-FIELD
NEGATIVE MAGNETORESISTANCE
CARBON NANOTUBES
TEMPERATURE
SEMICONDUCTOR
TRANSPORT
Ключевые слова (''Своб.индексиров.''): thin indium oxide films--weak localization--electron-electron--interaction--disordered semiconductors--nanostructured films--phase-coherent length
Аннотация: The negative magnetoresistance of thin In2O3 films, obtained by an autowave oxidation reaction, was detected within a temperature range of 4.2-80 K. The magnetoresistance was -1.35% at a temperature of 4.2 K and an external magnetic field of 1 T. A weak localization theory was used to explain the negative magnetoresistance and to determine the phase-coherence length in a temperature range of 4.2-80 K. The phase-coherence length was found to oscillate as the temperatures increased to around 30 K. From the maximum and minimum values of the oscillation of the phase-coherence length, it was suggested that the In2O3 film has two structure characteristic parameters. Transmission electron microscopy showed the structure of the thin In2O3 film to have structural features of a crystal phase- amorphous phase. It was found that the crystalline phase characteristic size was consistent with the maximum phase-coherence length and the amorphous phase characteristic size was consistent with the minimum phase-coherence length. It has been suggested that the temperature measurements of the magnetoresistance and the theory of weak localization can be used to evaluate the structural features of nanocomposite or nanostructured thin films. (C) 2016 Elsevier B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moiseenko E. T., Altunin R. R., Zharkov S. M.
Заглавие : Formation of the atomically ordered L10 structure with the [001] orientation during the solid-state reaction in Fe/Pd bilayer thin films
Коллективы : Russian Foundation for Basic Research [14-03-00515, 16-32-00225, 16-38-60075]
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2017. - Vol. 59, Is. 6. - P.1233-1237. - ISSN 1063-7834, DOI 10.1134/S1063783417060154. - ISSN 1090-6460(eISSN)
Примечания : Cited References:21. - This study was supported by the Russian Foundation for Basic Research, projects nos. 14-03-00515, 16-32-00225, and 16-38-60075.
Предметные рубрики: MAGNETIC-FIELD
SINGLE-CRYSTAL
FEPT FILMS
Аннотация: The formation of the atomically ordered L10-FePd structure during the solid-state reaction in Fe/Pd bilayer thin films is in situ investigated by electron microscopy and electron diffraction analysis. The initial iron and palladium layers were mainly coherently oriented crystallites with the orientation relationship α-Fe (001)[110] || Pd(001)[100]. It is established that the solid-state reaction between the iron and palladium layers upon heating at a rate of 4–8°C/min starts with the formation of the FePd solid solution at 390°C; at 430°C, the formation of the atomically ordered L10-FePd structure is observed. It is shown that at the low heating rate (4–8°C/min), the L10-FePd structure with the [001] orientation relative to the film plane forms, while at the high heating rate (50°C/min) it forms with the [100], [010], and [001] orientations.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parshin A. M., Zyryanov V. Ya., Shabanov V. F.
Заглавие : Structuring of the surface layer of polycarbonate film upon interaction with nematic liquid crystal
Коллективы : Russian Foundation for Basic Research [15-02-06924, 16-53-00073]
Место публикации : Polym. Sci. Ser. C. - 2018. - Vol. 60, Is. 1. - P.23-31. - ISSN 1811-2382, DOI 10.1134/S181123821801006X. - ISSN 1555-614X(eISSN)
Примечания : Cited References: 24. - This work was partially supported by the Russian Foundation for Basic Research (project nos. 15-02-06924 and 16-53-00073).
Предметные рубрики: TEMPERATURE-DEPENDENCE
MAGNETIC-FIELD
ALIGNMENT
ORIENTATION
Аннотация: The structure formation observed in the surface layer of polycarbonate which proceeds when nematic liquid crystal is deposited on a film is studied. Films prepared from polycarbonate solutions in dichloromethane, chloroform, or pyridine and dried in thermobalance at different temperatures and different drying times are studied. Textures are prepared in the process of domain growth. The effect of the orientation of the disclination lines in a magnetic field and the memory effect of molecular ordering after removal and redeposition of the liquid crystal layer are observed. The process of structure formation is analyzed on the basis of the model of cooperative interaction of liquid crystal molecules with polymer chains taking into account the adsorption mechanism.
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