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

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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 журнала
Шифр издания :
Автор(ы) : Vinogradova I. S., Falaleev O. V.
Заглавие : Formation of the vascular system of developing bean (Phaseolus limensis L.) seeds according to nuclear magnetic resonance microtomography
Место публикации : Russ. J. Dev. Biol.: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 43, Is. 1. - P.25-34. - ISSN 1062-3604, DOI 10.1134/S1062360412010079
Примечания : Cited References: 57. - The work was supported by the targeted program "Development of the Research Potential of Higher School" (project no. 2.1.1/2584).
Предметные рубрики: NMR MICROSCOPY
WATER-UPTAKE
COWPEA FRUIT
PLANTS
PHLOEM
TRANSPORT
FLOW
ARCHITECTURE
GRAINS
IMAGE
Ключевые слова (''Своб.индексиров.''): h-1 magnetic resonance microtomography--lima bean (phaseolus limensis) seeds--seed development and ripening--vascular bundles--transport of assimilates
Аннотация: H-1 magnetic resonance microtomography imaging was applied to study vascular systems in developing bean (Phaseolus limensis L.) seeds. Using the gradient echo method, we recorded 2D tomographic sections in the sagittal and axial planes of the fruits sampled from a vegetating plant on days 10, 17, 24, and 31 after fertilization. Any vascular connection between the tissues of maternal plant (bean pod and seed coat) and the embryo were undetectable. The embryo has an autonomous branched network of procambial strands in the cotyledons, converging to the embryonic axis. The bean pods are covered with a network of vascular bundles; large vascular strands run along the dorsal and ventral sutures. The seed coat vascular bundles are formed in the process of seed ripening and are represented by a developed vascular system multiply branching in the middle part of the ground parenchyma at the stage of physiological maturity. They are connected with the source of assimilates via the lateral pod veins and a large vascular bundle, entering the seed below the hilum via the placenta. Assimilates enter the external part of the seed coat, which contains no vascular bundles, via the funiculus vascular bundles and hilum tissue.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pichugin K. N., Pudlak M., Nazmitdinov R. G.
Заглавие : Spin-orbit effects in carbon nanotubes - Analytical results
Место публикации : Eur. Phys. J. B: Springer, 2014. - Vol. 87, Is. 6. - Ст.124. - ISSN 1434-6028, DOI 10.1140/epjb/e2014-50076-6. - ISSN 1434-6036
Примечания : Cited References: 21
Предметные рубрики: ELECTRONS
TRANSPORT
GRAPHENE
Аннотация: Energy spectra and transport properties of armchair nanotubes with curvature induced spin-orbit interaction are investigated thoroughly. The spin-orbit interaction consists of two terms: the first one preserves the spin symmetry in rotating frame, while the second one breaks it. It is found that the both terms are equally important: (i) at scattering on the potential step which mimics a long-range potential in the nanotubes; (ii) at transport via nanotube quantum dots. It is shown that an armchair nanotube with the first spin-orbit term works as an ideal spin-filter, while the second term produces a parasitic inductance.
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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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gokhfeld D. M.
Заглавие : An extended critical state model: Asymmetric magnetization loops and field dependence of the critical current of superconductors
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2014. - Vol. 56, Is. 12. - P.2380-2386. - ISSN 1063-7834, DOI 10.1134/S1063783414120129. - ISSN 1090-6460
Примечания : Cited References: 37
Предметные рубрики: CRITICAL-CURRENT DENSITY
HIGH-TEMPERATURE SUPERCONDUCTORS
II SUPERCONDUCTORS
SURFACE-BARRIER
MGB2
TRANSPORT
MOTION
J(C)
PEAK
Аннотация: An extended critical state model has been developed. The model has considered the equilibrium magnetization of a surface layer and the magnetization of the central region of a superconducting sample. The magnetic flux distributions in the sample have been calculated. An analytical dependence of the critical current density on the magnetic field with different behaviors in strong and weak fields has been proposed. A relation of the asymmetry of the magnetization loops and the critical current density to the sample size has been established. The model is applicable to the parameterization of magnetization loops of single-crystal and polycrystalline superconductors.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sadreev A. F., Maksimov D. N., Pilipchuk A. S.
Заглавие : Gate controlled resonant widths in double-bend waveguides: bound states in the continuum
Коллективы : Russian Science Foundation [14-12-00266]
Место публикации : J. Phys.: Condens. Matter: IOP Publishing, 2015. - Vol. 27, Is. 29. - Ст.295303. - ISSN 0953, DOI 10.1088/0953-8984/27/29/295303. - ISSN 1361648X(eISSN)
Примечания : Cited References:52. - This work is supported by the Russian Science Foundation through Grant No. 14-12-00266. AS is grateful K-F Berggren for discussions.
Предметные рубрики: CIRCULAR BENDS
NUCLEAR REACTIONS
FANO RESONANCES
UNIFIED THEORY
QUANTUM
TRANSMISSION
TRANSPORT
SYSTEMS
Ключевые слова (''Своб.индексиров.''): double-bent waveguide--effective non-hermittian hamiltonian--bound--states in the continuum
Аннотация: We consider quantum transmission through double-bend Pi- and Z-shaped waveguides controlled by the finger gate potential. Using the effective non-Hermitian Hamiltonian approach we explain the resonances in transmission. We show a difference in transmission in the short waveguides that is the result of different chirality in Z and Pi waveguides. We demonstrate that the potential selectively affects the resonant widths resulting in the occurrence of bound states in the continuum.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lyapina A. A., Maksimov D. N., Pilipchuk A. S., Sadreev A. F.
Заглавие : Bound states in the continuum in open acoustic resonators
Место публикации : J. Fluid Mech. - 2015. - Vol. 780. - P.370-387. - ISSN 0022-1120, DOI 10.1017/jfm.2015.480
Примечания : Cited References: 48. - This work has been supported by Russian Science Foundation through grant 14-12-00266.
Предметные рубрики: TRAPPED MODES
FANO RESONANCES
COMPLEX RESONANCES
PARALLEL PLATES
SIDE-BRANCHES
WAVE-GUIDES
ABSORPTION
TRANSPORT
CHANNELS
SYSTEM
Ключевые слова (''Своб.индексиров.''): aeroacoustics--noise control--wave scattering
Аннотация: We consider bound states in the continuum (BSCs) or embedded trapped modes in two- and three-dimensional acoustic axisymmetric duct-cavity structures. We demonstrate numerically that, under variation of the length of the cavity, multiple BSCs occur due to the Friedrich-Wintgen two-mode full destructive interference mechanism. The BSCs are detected by tracing the resonant widths to the points of the collapse of Fano resonances where one of the two resonant modes acquires infinite life-time. It is shown that the approach of the acoustic coupled mode theory cast in the truncated form of a two-mode approximation allows us to analytically predict the BSC frequencies and shape functions to a good accuracy in both two and three dimensions. © 2015 Cambridge University Press.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Romanova O. B., Galyas A. I., Sokolov V. V.
Заглавие : Study of electrical and thermoelecrical properties of sulfides TmxMn1-xS
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2016. - Vol. 58, Is. 1. - P.19-24. - ISSN 10637834 (ISSN), DOI 10.1134/S1063783416010029
Примечания : Cited References: 25. - This study was supported by the Russian Foundation for Basic Research (project no. 15-42-04099 r_si-bir_a) and State Contract no. 114090470016.
Предметные рубрики: SmxMn1-xS solid-solutions
MnS
Gd
Transition
Transport
Crystal
Аннотация: Variable-valence TmxMn1–xS (0 ⩽ x ⩽ 0.15) compounds have been synthesized and their structural, electrical, and thermoelectrical properties have been studied in the temperature range of 80–1100 K. The regions of existence of solid solutions of sulfides TmxMn1–xS with the NaCl-type fcc lattice have been determined. It has been found that, as thulium ions are substituted for manganese cations, the electrical resistivity increases, and the lattice parameter increases more sharply than that corresponding to the Vegard’s law. The study of the temperature dependences of the thermopower coefficient has revealed that the current carrier sign is retained to 500 K for all the substitution concentrations, and the charge carrier type changes from the hole type to the electron type with variations in the temperature. The experimental data have been explained in terms of the exciton model.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Myagkov V. G., Zhigalov V. S., Bykova L. E., Zharkov S. M., Matsynin A. A., Volochaev M. N., Tambasov I. A., Bondarenko G. N.
Заглавие : Thermite synthesis and characterization of Co-ZrO2 ferromagnetic nanocomposite thin films
Место публикации : J. Alloys Compd.: Elsevier, 2016. - Vol. 665. - P.197-203. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2015.12.257
Примечания : Cited References: 56. - This study was partially supported by the Russian Foundation for Basic Research (grants ##15-02-00948, 14-03-00515), by the Council for Grants of the President of the Russian Federation (SP-317.2015.1), and by the program of the Foundation for Assistance to Small Innovative Enterprises in Science and Technology (“UMNIK” program). The TEM studies were carried out using the facilities of Electron Microscopy Laboratory of Siberian Federal University and the Performance Service at Krasnoyarsk Scientific Center.
Предметные рубрики: SOLID-STATE SYNTHESIS
PHASE-FORMATION
ZrO2
NANOPARTICLES
TRANSPORT
OXIDE
MICROSTRUCTURE
NANOTHERMITE
FABRICATION
PARTICLES
Ключевые слова (''Своб.индексиров.''): thermite reactions--reactive films--ferromagnetic nanocomposite films--zro2
Аннотация: Co-ZrO2 ferromagnetic nanocomposite thin films were successfully synthesized using a new thermite reaction between Zr and Co3O4 in layer geometry. The initial Zr/Co3O4 bilayers were obtained by the deposition of Zr layers onto Co3O4 films at room temperature. The process of mixing at the Zr/Co3O4 interface and synthesis of fine-crystalline Co and amorphous ZrO2 phases started at a temperature above the initiation temperature Tin ∼250 °C which did not depend on the bilayer thickness. For the bilayer thickness more than 300 nm high-temperature fcc-Co and cubic c-ZrO2 (or tetragonal t-ZrO2) phases were formed. For the bilayer thickness less than ∼50 nm stable low-temperature hexagonal hcp-Co and monoclinic m-ZrO2 phases were also present in the reaction product. A partial transformation from Co3O4 to CoO occurred after annealing at 300 °C. The secondary reaction between CoO and Zr started soon after Co3O4 had been converted to the CoO phase. After annealing at 500 °C more than 80% of Co was reduced and the final product contained Co nanoparticles above and below the superparamagnetic critical size embedded into a dielectric ZrO2 matrix. The synthesized Co-ZrO2 nanocomposite films possessed soft magnetic behavior, high magnetization and good chemical stability.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhlin Y., Vorobyev S., Romanchenko A., Karasev S., Karacharov A., Zharkov S. M.
Заглавие : Ultrafine particles derived from mineral processing: A case study of the Pb-Zn sulfide ore with emphasis on lead-bearing colloids
Место публикации : Chemosphere: Elsevier, 2016. - Vol. 147. - P.60-66. - ISSN 00456535 (ISSN), DOI 10.1016/j.chemosphere.2015.12.096
Примечания : Cited References: 47. - This research was supported by the Russian Science Foundation, Grant No. 14-17-00280.
Предметные рубрики: GALENA DISSOLUTION
METALLIC COPPER
NANOPARTICLES
SOIL
ENVIRONMENT
SEPARATION
TRANSPORT
FLOTATION
WATER
SIZE
Ключевые слова (''Своб.индексиров.''): lead sulfide--lead-zinc ore--lead sulfide--ultrafine particles--aquatic nanoparticles
Аннотация: Although mining and mineral processing industry is a vast source of heavy metal pollutants, the formation and behavior of micrometer- and nanometer-sized particles and their aqueous colloids entered the environment from the technological media has received insufficient attention to date. Here, the yield and characteristics of ultrafine mineral entities produced by routine grinding of the Pb-Zn sulfide ore (Gorevskoe ore deposit, Russia) were studied using laser diffraction analysis (LDA), dynamic light scattering (DLS) and zeta potential measurement, microscopy, X-ray photoelectron spectroscopy, with most attention given to toxic lead species. It was revealed, in particular, that the fraction of particles less that 1 ?m in the ground ore typical reaches 0.4 vol. %. The aquatic particles in supernatants were micrometer size aggregates with increased content of zinc, sulfur, calcium as compared with the bulk ore concentrations. The hydrodynamic diameter of the colloidal species decreased with time, with their zeta potentials remaining about -12 mV. The colloids produced from galena were composed of 20-50 nm PbS nanoparticles associated with lead sulfate and thiosulfate, while the surface oxidation products at precipitated galena were largely lead oxyhydroxides. The size and zeta potential of the lead-bearing colloids decreased with time down to about 100 nm and from -15 mV to -30 mV, respectively. And, conversely, lead sulfide nanoparticles were mobilized before the aggregates during redispersion of the precipitates in fresh portions of water. The potential environmental impact of the metal-bearing colloids, which is due to the large-scale production and relative stability, is discussed. © 2015 Elsevier Ltd.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bouznik V. M., Morozov E. V., Avilova I. A., Volkov V. I.
Заглавие : NMR applications for polymer composite materials moisture uptake investigation
Место публикации : Appl. Magn. Reson.: Springer, 2016. - Vol. 47, Is. 3. - P.321-334. - ISSN 09379347 (ISSN), DOI 10.1007/s00723-015-0748-2
Примечания : Cited References: 41. - This research was performed with the financial support of Russian Foundation for Basic Research (project no. 14-29-10178 ofi_m).
Предметные рубрики: FIELD GRADIENT NMR
REINFORCED EPOXY COMPOSITES
WATER SELF-DIFFUSION
TRANSPORT
GLASS
SYSTEM
SPECTROSCOPY
TEMPERATURE
ABSORPTION
ADHESIVE
Аннотация: The 1H nuclear magnetic resonance (NMR) spectroscopy, NMR imaging, and pulsed field gradient NMR (PFG NMR) were applied for comparative study of moisture–polymer composite materials (PCM) interaction. The water uptake in PCM reinforced by aramid and carbon fibers was measured by NMR spectroscopy techniques. The aramid fiber-reinforced PCM absorbs water more intensively compared with PCM reinforced by carbon fiber, but both of them are retaining water inside of pores without formation of chemical bonds. Using NMR imaging the spatial distribution of water absorbed was visualized; preferable water pathways and influence of surface treatment on water-resistant properties were revealed. It was found that the surface rough treatment sufficiently improves the water absorption, but penetration of water molecules is still occurring only through the surfaces and it happens within a thin layer. PFG NMR technique revealed influence of pore structure on moisture–PCM interaction; it was found that additionally to strong hydrophobic properties of carbon fiber, the smaller total volume of pores sufficiently decrease the water uptake. Results achieved in this work demonstrate efficiency of NMR methods applied all together for investigation of PCM, and information obtained is practically important when designing advanced PCM with required properties. © 2016, Springer-Verlag Wien.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kolovsky A. R.
Заглавие : Hall conductivity beyond the linear response regime
Место публикации : Europhys. Lett. - 2011. - Vol. 96, Is. 5. - Ст.50002. - ISSN 0295-5075, DOI 10.1209/0295-5075/96/50002
Примечания : Cited References: 24. - This work was supported by Russian Foundation for Basic Research, grant RFBR-10-02-00171-a.
Предметные рубрики: MAGNETIC-FIELDS
ANTIDOT ARRAYS
NEUTRAL ATOMS
SUPERLATTICES
MAGNETORESISTANCE
TRANSPORT
ELECTRONS
Аннотация: This paper introduces a semi-analytical method for calculating the Hall conductivity in the single-band approximation. The method goes beyond the linear response theory and thus, it formally imposes no limitation on the electric-field magnitude. It is shown that, when the Bloch frequency exceeds the cyclotron frequency, the Hall current decreases with increasing electric field. The obtained results can be directly applied to the cold Bose atoms in a 2D optical lattice, where the single-band approximation is well justified. Copyright (C) EPLA, 2011
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13.

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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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavrichkov V. A., Ovchinnikov S. G., Nekrasov I. A., Pchelkina Z. V.
Заглавие : Electronic Structure of p-Type La1-xMx2+MnO3 Manganites in the Ferromagnetic and Paramagnetic Phases in the LDA plus GTB Approach
Разночтения заглавия :авие SCOPUS: Electronic structure of p-Type La 1-x M x 2+ MnO 3 manganites in the ferromagnetic and paramagnetic phases in the LDA + GTB approach
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 112, Is. 5. - P860-876. - ISSN 1063-7761, DOI 10.1134/S1063776111030101
Примечания : Cited References: 47. - This study was supported financially by integration project no. 40 of the Ural and Siberian Branches of the Russian Academy of Sciences, the program "Strong Electron Correlations" of the Russian Academy of Sciences, and the Russian Foundation for Basic Research (project no. 10-02-00251-a).
Предметные рубрики: DOUBLE-EXCHANGE
COLOSSAL MAGNETORESISTANCE
THIN-FILMS
PHYSICS
LA1-XSRXMNO3
RESISTIVITY
SEPARATION
TRANSPORT
MODEL
Ключевые слова (''Своб.индексиров.''): complex structure--cubic materials--ferromagnetic phase--half metals--jahn teller effect--metal properties--metal types--orbitals--p-type--paramagnetic phase--paramagnetic phasis--quasi particles--spectral intensity--spin projections--strong electron correlations--barium--density functional theory--electron correlations--electron density measurement--electronic properties--electronic structure--fermi level--ferromagnetic materials--ferromagnetism--manganese oxide--manganites--paramagnetic materials--paramagnetism--valence bands--lanthanum
Аннотация: The band structure, spectral intensity, and position of the Fermi level in doped p-type La1-xMx2+ MnO3 manganites (M = Sr, Ca, Ba) is analyzed using the LDA + GBT method for calculating the electronic structure of systems with strong electron correlations, taking into account antiferro-orbital ordering and using the Kugel-Khomskii ideas and real spin S = 2. The results of the ferromagnetic phase reproduce the state of a spin half-metal with 100% spin polarization at T = 0, when the spectrum is of the metal type for a quasiparticle with one spin projection and of the dielectric type for the other. It is found that the valence band becomes approximately three times narrower upon a transition to the paramagnetic phase. For the paramagnetic phase, metal properties are observed because the Fermi level is located in the valence band for any nonzero x. The dielectrization effect at the Curie temperature is possible and must be accompanied by filling of d(x) orbitals upon doping. The effect itself is associated with strong electron correlations, and a complex structure of the top of the valence band is due to the Jahn-Teller effect in cubic materials. DOI: 10.1134/S1063776111030101
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gokhfeld D. M., Balaev D. A., Petrov M. I., Popkov S. I., Shaykhutdinov K. A., Val'kov V. V.
Заглавие : Magnetization asymmetry of type-II superconductors in high magnetic fields
Место публикации : J. Appl. Phys.: AMER INST PHYSICS, 2011. - Vol. 109, Is. 3. - Ст.33904. - ISSN 0021-8979, DOI 10.1063/1.3544038
Примечания : Cited References: 23. - D. M. Gokhfeld is thankful to S. A. Satzuk and Yu. S. Gokhfeld for discussions. The work is supported by Project No. 7 of RAS Program "Quantum physics of condensed matter," Federal Target Program " Research and scientific-pedagogical cadres of Innovative Russia" and Grant No. 13 of Lavrentyev competition of young researchers of SB RAS.
Предметные рубрики: HIGH-TEMPERATURE SUPERCONDUCTORS
CRITICAL-STATE MODEL
CRITICAL-CURRENT DENSITIES
SURFACE-BARRIER
TRANSPORT
Ключевые слова (''Своб.индексиров.''): field distribution--high magnetic fields--inhomogeneous distribution--magnetization loops--pinning forces--thermal equilibriums--type ii superconductors--lead--magnetic fields--superconducting materials--superconductivity--magnetization
Аннотация: Inhomogeneous distribution of the pinning force in superconductor results in a magnetization asymmetry. A model considering the field distribution in superconductor was developed and symmetric and asymmetric magnetization loops of porous and textured Bi1.8Pb0.3Sr1.9Ca2Cu3Ox were fitted. It is found that the thermal equilibrium magnetization realizes in crystals smaller than some size depending on temperature and magnetic field. (C) 2011 American Institute of Physics. [doi:10.1063/1.3544038]
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Divin A., Markidis S., Lapenta G., Semenov V. S., Erkaev N. V., Biernat H. K.
Заглавие : Model of electron pressure anisotropy in the electron diffusion region of collisionless magnetic reconnection
Коллективы :
Место публикации : Phys. Plasmas: AMER INST PHYSICS, 2010. - Vol. 17, Is. 12. - Ст.122102. - ISSN 1070-664X, DOI 10.1063/1.3521576
Примечания : Cited References: 42. - The present work is supported partially by the Onderzoekfonds KU Leuven (Research Fund KU Leuven) and by the European Commission's Seventh Framework Programme (FP7/2007-2013) under grant Agreement No. 218816 (SOTERIA project, www.soteria- space.eu). Additional support is provided by RFBR (Grant No. 09-05-91000-ANF-a). V.S.S. thanks ISSI for hospitality and financial support. The simulations were conducted on the resources of the Vlaams Supercomputer Centrum (VSC) at the Katholieke Universiteit Leuven.
Предметные рубрики: CURRENT SHEETS
X-LINE
PLASMA
DISSIPATION
FIELD
SIMULATIONS
ACCELERATION
TRANSPORT
Ключевые слова (''Своб.индексиров.''): analytical results--antiparallel configuration--collisionless--electron diffusion--electron population--electron pressures--magnetic reconnections--neutral line--new model--particle-in-cell simulations--two particles--anisotropy--astrophysics--collisionless plasmas--computer simulation--diffusion--geophysics--magnetic fields--magnetic properties--plasma simulation--electrons
Аннотация: A new model of the electron pressure anisotropy in the electron diffusion region in collisionless magnetic reconnection is presented for the case of antiparallel configuration of magnetic fields. The plasma anisotropy is investigated as source of collisionless dissipation. By separating electrons in the vicinity of the neutral line into two broad classes of inflowing and accelerating populations, it is possible to derive a simple closure for the off-diagonal electron pressure component. The appearance of these two electron populations near the neutral line is responsible for the anisotropy and collisionless dissipation in the magnetic reconnection. Particle-in-cell simulations verify the proposed model, confirming first the presence of two particle populations and second the analytical results for the off-diagonal electron pressure component. Furthermore, test-particle calculations are performed to compare our approach with the model of electron pressure anisotropy in the inner electron diffusion region by Fujimoto and Sydora [Phys. Plasmas 16, 112309 (2009)]. (C) 2010 American Institute of Physics. [doi:10.1063/1.3521576]
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Korshunov M. M., Kozeeva L. P., Lavrov A. N.
Заглавие : Peculiarity of interrelation between electronic and magnetic properties of HTSC cuprates associated with short-range antiferromagnetic order
Коллективы :
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2010. - Vol. 111, Is. 1. - P104-113. - ISSN 1063-7761, DOI 10.1134/S1063776110070101
Примечания : Cited References: 48. - This study was financially supported by the Russian Foundation for Basic Research (project nos. 09-02-01224 and 09-02-00127) and under the program "Quantum Physics of Condensed Media" of the Presidium of the Russian Academy of Sciences (project no. 5.7).
Предметные рубрики: T-J MODEL
NORMAL-STATE
FERMI-SURFACE
RESISTIVITY ANISOTROPY
3-CENTER INTERACTIONS
OPTICAL CONDUCTIVITY
COPPER OXIDES
CUO2 PLANES
SUPERCONDUCTORS
TRANSPORT
Ключевые слова (''Своб.индексиров.''): anisotropic resistivity--antiferromagnetic orders--concentration dependence--cuprates--doping levels--electronic and magnetic properties--fermi surface topology--high temperature superconducting--magnetic orders--magnetic state--maximum values--pseudo-gap--short-range magnetic orders--strong electron correlations--temperature dependence--anisotropy--antiferromagnetic materials--antiferromagnetism--copper compounds--correlators--electronic properties--high temperature superconductors--hole concentration--magnetic properties--neon--superconducting magnets--single crystals
Аннотация: We report on the results of measurements of anisotropic resistivity of RBa(2)Cu(3)O(6 + x) (R = Tm, Lu) high-temperature superconducting single crystals in a wide range of doping levels, indicating a nontrivial effect of magnetic order on the electronic properties of cuprates. In particular, our results visually demonstrate the crossover from the state with moderate anisotropy of resistivity rho (c) /rho (ab) similar to 30 to a strongly anisotropic state with rho (c) /rho (ab) similar to 7 x 10(3) upon cooling as well as upon a decrease in the hole concentration in the CuO(2) planes. It is also shown that anisotropy is sensitive to the magnetic state of CuO(2) planes and attains its maximum value after the establishment of the long-range antiferromagnetic order. The results are discussed in the framework of the theory based on the t-t'-taEuro(3)-J model of CuO(2) layers taking into account strong electron correlations and short-range magnetic order. In this theory, anomalies of spin correlators and Fermi surface topology for a critical hole concentration of p* a parts per thousand 0.24 are demonstrated. The concentration dependence of the charge carrier energy indicates partial suppression of energy due to the emergence of a pseudogap at p p*. This theory explains both the experimentally observed sensitivity of anisotropy in conductivity to the establishment of the antiferromagnetic order and the absence of anomalies in the temperature dependence of resistivity rho (ab) (T) in the vicinity of the N,el temperature.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Ryabinkina L. I., Romanova O. B., Har'kov A. M., Gorev M. V., Balaev A. D., Eremin E. V., Bovina A. F.
Заглавие : The magnetoelastic effect in CoxMn1-xS solid solutions
Коллективы :
Разночтения заглавия :авие SCOPUS: The magnetoelastic effect in Cox Mn1 - x S solid solutions
Место публикации : Solid State Commun.: PERGAMON-ELSEVIER SCIENCE LTD, 2010. - Vol. 150, Is. 13-14. - P564-567. - ISSN 0038-1098, DOI 10.1016/j.ssc.2010.01.009
Примечания : Cited References: 13. - This work was supported by the Russian Foundation for Basic Research projects no. 08-02-00364-a, no. 08-02-90031, no. F08037, F08-229, and no. 09-02-00554-a.
Предметные рубрики: YVO3 SINGLE-CRYSTAL
SPIN-STATE
TRANSITION
TRANSPORT
PHYSICS
LACOO3
Ключевые слова (''Своб.индексиров.''): semiconductors--x-ray scattering--galvanomagnetic effects--thermal expansion--semiconductors--x-ray scattering--galvanomagnetic effects--thermal expansion--semiconductors--x-ray scattering--coefficient of thermal expansion--magnetoelastic effects--orbital ordering--temperature hysteresis--temperature range--zero magnetic fields--crystallization--electric resistance--magnetic field effects--magnetoresistance--manganese--manganese compounds--neon--organic polymers--scattering--semiconductor quantum dots--solid solutions--solidification--thermal stress--x ray scattering--thermal expansion
Аннотация: The magnetization of cation-substituted CoxMn(1-x)S sulfides upon cooling in zero magnetic field and in a field in the temperature range 4-300 K has been measured and the resistance versus magnetic field (up to 10 kOe) dependences have been obtained. Magnetoresistance and temperature hysteresis of magnetization versus prehistory are found at the magnetic field H 0.1 T and at T 240 K. The interrelation between the magnetic and elastic subsystems of the CoxMn1-xS solid solutions has been established. A jump in the coefficient of thermal expansion is observed at the Neel temperature. The features of the physical properties are explained by orbital ordering. (C) 2010 Elsevier Ltd. All rights reserved.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrov M. I., Balaev D. A., Gokhfeld D. M.
Заглавие : Andreev reflection and experimental temperature dependences of the critical current in heterogeneous high-temperature superconductors (polycrystals and related composites)
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2007. - Vol. 49, Is. 4. - P619-626. - ISSN 1063-7834, DOI 10.1134/S106378340704004X
Примечания : Cited References: 41
Предметные рубрики: CURRENT-VOLTAGE CHARACTERISTICS
NORMAL-METAL
WEAK LINKS
JOSEPHSON-JUNCTIONS
MODEL
SCATTERING
TRANSPORT
DISSIPATION
HYSTERESIS
Аннотация: The temperature dependences of the critical current of Y3/4Lu1/4Ba2Cu3O7 polycrystalline high-temperature superconductors subjected to annealing for different times and those of Y3/4Lu1/4Ba2Cu3O7 + BaPbO3 composites were measured. The results obtained were analyzed in terms of the Gunsenheimer-Schussler-Kummler theory considering the Andreev reflection of carriers in a "superconductor-normal metal-superconductor" (S-N-S) junction. Good agreement between the experimental and theoretical temperature dependences of the critical current over a wide temperature range for polycrystals with both natural and artificially created boundaries (composites) made it possible to estimate the effective length of grain boundaries in the high-temperature superconductors. It was revealed that the critical current density measured at 4.2 K is an exponential function of the length of grain boundaries in samples of both types.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gokhfeld D. M.
Заглавие : Description of hysteretic current-voltage characteristics of superconductor-normal metal-superconductor junctions
Место публикации : Supercond. Sci. Technol.: IOP PUBLISHING LTD, 2007. - Vol. 20, Is. 1. - P62-66. - ISSN 0953-2048, DOI 10.1088/0953-2048/20/1/011
Примечания : Cited References: 24
Предметные рубрики: HIGH-TEMPERATURE SUPERCONDUCTOR
WEAK LINKS
POLYCRYSTALLINE HTSC
ANDREEV REFLECTION
SIMPLIFIED MODEL
COMPOSITES
TRANSPORT
Ключевые слова (''Своб.индексиров.''): computational methods--current voltage characteristics--electric resistance--josephson junction devices--mathematical models--yttrium barium copper oxides--andreev reflection--metal superconductor junctions--metallic josephson junction--weak links--semiconductor junctions
Аннотация: A simplified model for the current-voltage characteristics of weak links is suggested. It is based on an approach considering the multiple Andreev reflection in a metallic Josephson junction. The model allows one to calculate the current-voltage characteristics of superconductor-normal metal-superconductor junctions with different thicknesses of normal layer at different temperatures. A hysteretic peculiarity of the V(I) dependence is described as a result of the negative differential resistance. The current-voltage characteristics of tin microbridges and high- T-c composite YBCO + BaPbO3 were computed.
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