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Pynko, V. G.
Ferromagnetic magnetic resistance and energetic crystallographic anisotropy / V. G. Pynko, N. I. Kiselev // Pisma Zhurnal Tek. Fiz. - 1989. - Vol. 15, Is. 1. - P. 44-47. - Cited References: 4 . - ISSN 0320-0116

РУБ Physics, Applied

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Доп.точки доступа:
Kiselev, N. I.; Пынько, Виталий Григорьевич
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Pichugin, K. N.
Irregular Aharonov-Bohm oscillations in finite width rings / K. N. Pichugin, A. F. Sadreev // Zhurnal Eksperimentalnoi Teor. Fiz. - 1996. - Vol. 109, Is. 2. - P. 546-561. - Cited References: 47 . - ISSN 0044-4510

РУБ Physics, Multidisciplinary
Рубрики:
HALF FLUX QUANTA
   EDGE STATES
   MAGNETIC-FIELD
   CIRCULAR BENDS
   WIRES
   TRANSPORT
   MAGNETOTRANSPORT
   RESISTANCE
   FLUCTUATIONS
   CONDUCTANCE

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Доп.точки доступа:
Sadreev, A. F.
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Wigner function description of ac transport through a two-dimensional quantum point contact / I. E. Aronov [et al.] // J. Phys.: Condens. Matter. - 1997. - Vol. 9, Is. 24. - P. 5089-5103, DOI 10.1088/0953-8984/9/24/009. - Cited References: 45 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
QUANTIZED CONDUCTANCE
   BALLISTIC-RESISTANCE
   CONSTRICTION
   CAPACITANCE
   ADMITTANCE
   ELECTRONS
   SYSTEMS
   FIELD
   PUMP
Аннотация: We have calculated the admittance of a two-dimensional quantum point contact (QPC) using a novel variant of the Wigner distribution function (WDF) formalism. In the semiclassical approximation, a Boltzmann-like equation is derived for the partial WDF describing both propagating and non-propagating electron modes in an effective potential generated by the adiabatic QPC. We show that this quantum kinetic approach leads to the well known stepwise behaviour of the real part of the admittance (the conductance), and of the imaginary part of the admittance (the emittance), in agreement with the latest results derived by Christen and Buttiker, which is determined by the number of propagating electron modes. It is shown that the emittance is sensitive to the geometry of the QPC, and can be controlled by the gate voltage. We have established that the emittance has contributions corresponding to both quantum inductance and quantum capacitance. Stepwise oscillations in the quantum inductance are determined by the harmonic mean of the velocities for the propagating modes, whereas the quantum capacitance is a significant mesoscopic manifestation of the nonpropagating (reflecting) modes.

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Держатели документа:
LOS ALAMOS NATL LAB,CNLS,LOS ALAMOS,NM 87545
UKRAINIAN ACAD SCI,INST RADIOPHYS & ELECT,UA-310085 KHARKOV,UKRAINE
LV KIRENSKII INST PHYS,KRASNOYARSK 660036,RUSSIA
UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801
ИФ СО РАН
Theoretical Division, CNLS, Los Alamos National Laboratory, Los Alamos, NM 87545, United States
Inst. Radiophysics and Electronics, Natl. Academy of Sciences of Ukraine, 12 Acad Proskura Street, 310085, Kharkov, Ukraine
Kirensky Institute of Physics, 660036, Krasnoyarsk, Russian Federation
Department of Physics, Univ. Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, IL 61801-3080, United States

Доп.точки доступа:
Aronov, I. E.; Berman, G. P.; Campbell, D. K.; Dudiy, S. V.
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Bulgakov, E. N.
Mixing of bound states with electron transport by a radiation field in waveguides / E. N. Bulgakov, A. F. Sadreev // J. Exp. Theor. Phys. - 1998. - Vol. 87, Is. 6. - P. 1058-1067, DOI 10.1134/1.558621. - Cited References: 27 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
CLASSICALLY UNBOUND SYSTEM
   HALL RESISTANCE ANOMALIES
   QUANTUM WAVE-GUIDES
   POINT CONTACTS
   WIRES
   TIME
   CONDUCTANCE
Аннотация: Electron transmission in the two-, three-, and four-terminal nanostructures is considered under the influence of a radiation field. The frequency of the radiation field is tuned to the transition between the energy of a bound state and the Fermi energy of the incident electrons. The radiation induced resonant peaks and dips of the electron transport are exhibited for zero and low magnetic fields. It is shown that rotation of the radiation field polarization can effectively control the electron transport into different electrodes attached to the structures because of the symmetry of the structures. The resonant anomalies of the Hall resistance are found in a weak magnetic field. (C) 1998 American Institute of Physics. [S1063-7761(98)00412-0].

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Abo Akad Univ, Inst Fys, Dept Phys, SF-20500 Abo, Finland
ИФ СО РАН

Доп.точки доступа:
Sadreev, A. F.; Садреев, Алмаз Фаттахович; Булгаков, Евгений Николаевич
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Balaev, A. D.
Quantum oscillations of resistance and magnetization in the degenerate semiconductor n-HgCr2Se4 / A. D. Balaev, V. A. Gavrichkov, S. G. Ovchinnikov // J. Exp. Theor. Phys. - 1998. - Vol. 86, Is. 5. - P. 1026-1029, DOI 10.1134/1.558549. - Cited References: 6 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary

Аннотация: In the magnetic field range Delta H = 8-60 kOe we observed and studied the anomalous oscillations in the magnetic field dependence of the resistance and magnetization of single crystals of n-HgCr2Se4. The absence of periodicity in 1/H in the Delta H = 8-20 kOe range can be explained by the non-Fermi-liquid behavior of the electron subsystem and agrees with the theory of the de Haas-van Alphen in systems with intermediate valence. In stronger fields, Delta H = 20-60 kOe, the amplitude of the fundamental harmonic decreases, with the number and amplitude of the higher-order harmonics increasing, As a result, noise is superimposed on the signal as magnetic field strength grows. The temperature dependence of the magnetization is the sum of the monotonic spin-wave contribution and the oscillating part. (C) 1998 American Institute of Physics. [S1063-7761(98)02205-7].

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Публикация на русском языке Квантовые осцилляции сопротивления и намагниченности в вырожденном полупроводнике n-HgCr_2Se_4 [Текст] / А. Д. Балаев [и др.] // Журн. эксперим. и теор. физ. - 1998. - Т. 113 Вып. 5. - С. 1877-1882

Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660074, Russia
Russian Acad Sci, NS Kurnakov Gen & Inorgan Chem Inst, Moscow 117907, Russia
ИФ СО РАН

Доп.точки доступа:
Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Балаев, Александр Дмитриевич
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Gavrichkov, V. A.
Characteristic features of the extrinsic electric resistance in ferromagnets with low carrier density / V. A. Gavrichkov, S. G. Ovchinnikov // Phys. Solid State. - 1999. - Vol. 41, Is. 1. - P. 59-66, DOI 10.1134/1.1130731. - Cited References: 26 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
QUANTUM TEMPERATURE OSCILLATIONS
   MAGNETIC SEMICONDUCTORS
   HGCR2SE4
   RESISTIVITY
   FILMS
Аннотация: Switching from simple semiconductors to more complicated chemical compositions, we encounter mainly nonstoichiometric or undoped compounds. Combined with other characteristic features of d(f) compounds, this can lead, together with the ordinary scattering by spin disorder in magnetic semiconductors, to an unusual impurity contribution to the total scattering of carriers even in intrinsic semiconductors. A unique scheme for calculating the energy structure of the conduction-band bottom of a ferromagnetic semiconductor and the temperature and field dependences of the impurity contribution to the resistivity is proposed on the basis of a model Hamiltonian. The computed magnetoresistance ratio is negative and has a maximum near T-c. A qualitative comparison is made between the results and the experimental temperature dependences of the Hall mobility and magnetoresistance ratio in the ternary semiconductor n-HgCr2Se4, which is nonstoichiometric with respect to the chalcogen. To identify previously unobserved temperature oscillations of the resistance, a careful analysis is made of the low-temperature part of the resistance using the relations obtained. (C) 1999 American Institute of Physics. [S1063-7834(99)01701-3].

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Публикация на русском языке Гавричков, Владимир Александрович. Особенности примесного электросопротивления в ферромагнетиках с малой концентрацией носителей [Текст] / В. А. Гавричков, С. Г. Овчинников // Физ. тверд. тела. - С.-Петербург, 1999. - Т. 41 Вып. 1. - С. 68-76

Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Гавричков, Владимир Александрович
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Bulgakov, E. N.
The effect of bound states in microwave waveguides on electromagnetic wave propagation / E. N. Bulgakov, A. F. Sadreev // Tech. Phys. - 2001. - Vol. 46, Is. 10. - P. 1281-1290, DOI 10.1134/1.1412064. - Cited References: 15 . - ISSN 1063-7842

РУБ Physics, Applied
Рубрики:
RADIATION-FIELD
   HALL RESISTANCE
   QUANTUM WIRES
   GUIDES
Аннотация: The transmission of a TE microwave field with a frequency omega through Gamma, T, and X waveguide junctions filled with a ferromagnetic is considered. These junctions are known to have bound states with below-cutoff frequencies. A probing microwave radiation with a frequency Omega applied to the scattering region generates magnetic oscillations with frequencies omega + n Omega (where n = 0, +/-1, +/-2, ...), which resonantly combine with the bound waveguide states. This effect provides for a new method of studying bound waveguide states and efficiently controlling the transmission of microwave radiation. (C) 2001 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
Linkoping Univ, Dept Phys & Measurement Technol, S-58183 Linkoping, Sweden
ИФ СО РАН
Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Dept. of Phys. and Msrmt. Technology, Linkoping University, S-581 83 Linkoping, Sweden

Доп.точки доступа:
Sadreev, A. F.; Садреев, Алмаз Фаттахович; Булгаков, Евгений Николаевич
}
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Multiple bound states in scissor-shaped waveguides / E. N. Bulgakov [et al.] // Phys. Rev. B. - 2002. - Vol. 66, Is. 15. - Ст. 155109, DOI 10.1103/PhysRevB.66.155109. - Cited References: 32 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
QUANTUM WAVE-GUIDES
   HELMHOLTZ EQUATION
   RADIATION-FIELD
   HALL RESISTANCE
   RESONANCES
   WIRES
   PROPAGATION
   MODES
Аннотация: We study bound states of the two-dimensional Helmholtz equations with Dirichlet boundary conditions in an open geometry given by two straight leads of the same width which cross at an angle theta. Such a four-terminal junction with a tunable theta can realized experimentally if a right-angle structure is filled by a ferrite. It is known that for theta=90degrees there is one proper bound state and one eigenvalue embedded in the continuum. We show that the number of eigenvalues becomes larger with increasing asymmetry and the bound-state energies are increasing as functions of theta in the interval (0,90degrees). Moreover, states which are sufficiently strongly bound exist in pairs with a small energy difference and opposite parities. Finally, we discuss how the bound states transform with increasing theta into quasibound states with a complex wave vector.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Acad Sci Czech Republ, Inst Nucl Phys, CZ-25068 Rez, Czech Republic
Czech Tech Univ, Doppler Inst, Prague 11519, Czech Republic
Linkoping Univ, Dept Phys & Measurement Technol, S-58183 Linkoping, Sweden
ИФ СО РАН

Доп.точки доступа:
Bulgakov, E. N.; Булгаков, Евгений Николаевич; Exner, P.; Pichugin, K. N.; Пичугин, Константин Николаевич; Sadreev, A. F.; Садреев, Алмаз Фаттахович
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Andreev reflections and experimental current-voltage characteristics of break junctions of polycrystalline HTSC / M. I. Petrov [et al.] // Physica C. - 2004. - Vol. 408: 7th International Conference on Materials and Mechanisms of Superconductive and High Temperature Superconductors (MAY 25-30, 2003, Rio de Janeiro, BRAZIL). - P. 620-622, DOI 10.1016/j.physc.2004.03.085. - Cited References: 3 . - ISSN 0921-4534

РУБ Physics, Applied

Кл.слова (ненормированные):
Andreev reflections -- break junction -- current-voltage characteristics -- Andreev reflections -- Break junction -- Current-voltage characteristics -- Andreev reflections -- Break junctions -- Elastic scattering -- Lattice defects -- Negative differential resistance -- Electric fields -- Heuristic methods -- Hysteresis -- Microcracks -- Polycrystalline materials -- Probability density function -- Quasicrystals -- Superconducting materials -- Yttrium barium copper oxides -- Current voltage characteristics
Аннотация: The temperature evolution of current-voltage characteristics (CVCs) of break junctions made from polycrystalline Y0.75Lu0.25Ba2Cu3O7 and La1.85Sr0.15CuO4 is investigated. The experimental CVCs have hysteretic features that reflect a part of a curve with negative differential resistance. The temperature evolution of the CVCs is discussed within the framework of the Kummel-Gunsenheimer-Nicolsky theory for superconductor/normal-metal/superconductor junctions considering multiple Andreev reflections. It is shown that the shape of the CVCs of break junctions is determined by the ratio of the number of "short" and "long" intergrain normal regions in the polycrystalline HTSC under investigation. (C) 2004 Elsevier B.V. All rights reserved.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
Univ Wurzburg, Inst Theoret Phys & Astrophys, D-97074 Wurzburg, Germany
ИФ СО РАН
Kirensky Intitute of Physics, Akademgorodok, 660036 Krasnoyarsk, Russian Federation
Reshetnev Siberian Stt. Aerosp. U., 660014 Krasnoyarsk, Russian Federation
Inst. fur Theor. Phys./Astrophys., Universitat Wurzburg, D-97074 Wurzburg, Germany

Доп.точки доступа:
Petrov, M. I.; Петров, Михаил Иванович; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Balaev, D. A.; Балаев, Дмитрий Александрович; Shaihutdinov, K. A.; Kummel, R.
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10.

Large magneto-resistance of high-T-C superconductor based composites to low magnetic fields at the liquid nitrogen temperature / D. A. Balaev [et al.] // Physica C. - 2004. - Vol. 408: 7th International Conference on Materials and Mechanisms of Superconductive and High Temperature Superconductors (MAY 25-30, 2003, Rio de Janeiro, BRAZIL). - P. 943-944, DOI 10.1016/j.physc.2004.03.173. - Cited References: 6 . - ISSN 0921-4534

РУБ Physics, Applied

Кл.слова (ненормированные):
HTSC -- magnetic field sensors -- magneto-resistance
Аннотация: The magneto-resistive effect in bulk 123YBCO + CuO and YBCO + Normal metal BaPbO3 composites prepared by fast backing technique has been studied. The composites exhibit broadening of resistive transition in low magnetic fields (less than 200 Oe) for a wide temperature range. Experimental dependences of resistivity versus magnetic field at various transport current densities are presented and discussed. The HTSC based composites exhibit a much higher sensitivity to weak magnetic fields at liquid nitrogen temperature, as compared to that for the "pure" HTSC ceramics. This effect is attractive for possible practical applications and may be used in magnetic field sensor devices. (C) 2004 Elsevier B.V. All rights reserved.

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Держатели документа:
Kirensky Inst Phys, Akademgorodok, Krasnoyarsk 660036, Russia
Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Shaihutdinov, K. A.; Popkov, S. I.; Попков, Сергей Иванович; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Petrov, M. I.; Петров, Михаил Иванович
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