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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Драница М.В., Пахомов П. С., Киреев Н. Е., Орешонков, Александр Сергеевич
Заглавие : Численная оценка приведенного сопротивления теплопередаче оконных блоков различных конфигураций
Место публикации : Изв. вузов. Строительство. - 2022. - № 10. - С. 76-81. - ISSN 05361052 (ISSN), DOI 10.32683/0536-1052-2022-766-10-76-81; News High. Edu. Inst. Construct.
Примечания : Библиогр.: 8
Аннотация: В работе обсуждаются вопросы энергоэффективности пластиковых окон при заполнении межстекольного пространства осушенным воздухом, аргоном, криптоном, ксеноном и элегазом. Для численного расчета приведенного сопротивления теплопередаче оконных блоков с различными конфигурациями светопрозрачной части использованы современные программные комплексы Them 7.6 и Window 7.6. На основе полученных результатов разработаны рекомендации по использованию конфигураций стеклопакетов с заполнением воздухом и газами, отличными от него.This article discusses the energy efficiency of plastic windows with the filling the space between panes by dry air, argon, krypton, xenon and SF6 gas. Numerical calculation of reduced resistance to heat transfer of window blocks with different configurations of the transparent part were performed using Them 7.6 and Window 7.6 software. Finally, the results of this work can be used for developing recommendations of using the window block configurations filled with air and gases other than.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Мельникова Е. И., Колоненко, Андрей Леонидович, Глущенко, Гарий Анатольевич, Осипова, Ирина Владимировна, Чурилов, Григорий Николаевич
Заглавие : Плазменный методы получения пористых порошков магния с высокой сорбционной емкостью по водороду и устойчивостью к рециклированию
Коллективы : Национальная Академия наук Украины, Российская академия наук, Национальная Академия наук Беларуси, Украинское материаловедческое общество, Институт проблем материаловедения им. И.Н. Францевича НАН Украины, Институт высоких температур РАН, Московский государственный технический университет им. Н.Э. Баумана, Институт тепло- и массообмена им. А.В. Лыкова НАН Беларуси, ИНТЕМ, ООО, "Материалы и покрытия в экстремальных условиях: исследования, применение, экологически чистые технологии производства и утилизации изделий", международная конференция (8; 22-26 сент. 2014 г.; Киев), "Materials and Coatings for Extreme Performances: Investigations, Applications, Ecologically Safe Technologies for Their Production and Utilization", International Conference (8; 22-26 Sept. 2014; Kiev, Ukraine)
Место публикации : Восьмая междунар. конф. "Матер. и покрытия в экстрем. условиях: исслед., прим., экологически чистые технол. произв-ва и утилизации изделий": Тез. конф. - 2014. - P.67
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Иваненко, Александр Анатольевич, Тамбасов, Игорь Анатольевич, Шестаков, Николай Петрович
Заглавие : Микроколориметр для измерения коэффициента излучения тонкопленочных высокоотражающих образцов при криогенных температурах
Место публикации : Космич. аппараты и технол. - 2018. - Т. 2, № 3. - С. 165-169. - ISSN 2618-7957, DOI 10.26732/2618-7957-2018-3-165-169
Примечания : Библиогр.: 9
Ключевые слова (''Своб.индексиров.''): коэффициент излучения--степень черноты--"черное тело"--термометр сопротивления--криогенные температуры--высокоотражающие покрытия--emissivity--blackness degree--"blackbody"--resistance thermometer--cryogenic temperatures--highly reflective coatings
Аннотация: Предложено решение проблемы измерения коэффициента излучения (степени черноты) тонкопленочных высокоотражающих образцов при криогенных и комнатных температурах. Для обеспечения необходимой точности и чувствительности создан тонкопленочный элемент, содержащий платиновый датчик температуры и нагреватель, а также пленка с высоким коэффициентом излучения - модель «черного тела». На базе этих элементов, криостата замкнутого цикла TM AC-V12a фирмы Cryomech (США) и крейтовой системы LTR-EU-8-1 сбора информации с модулями АЦП и ЦАП фирмы L-CARD (Россия) создана установка для измерения теплопередачи между пленочными покрытиями, осуществляемой за счет излучения. Раскрыты способы обработки результатов измерений, осуществляемой при оценке сопротивления платиновых датчиков температуры, которые позволяют производить измерение температуры со среднеквадратическим отклонением 0,001 К. Описаны базовые элементы установки. Описаны проводимые на установке измерения, необходимые для вычисления коэффициента излучения. Приведена методика расчета коэффициента излучения с использованием результатов измерений, проводимых с помощью микрокалориметра.A solution to the problem of measuring the emissivity (degree of blackness) of thin-film high-reflective samples at cryogenic and room temperatures is proposed. To ensure the required accuracy and sensitivity, a thin-film element containing a platinum temperature sensor and a heater, as well as a high emissivity film (a black body model) has been created. On the basis of these elements, the cryomech TM AC-V12a cryostat of the company Cryomech (USA) and the LTR-EU-8-1 crate of data collection with the ADC and DAC modules of the L-CARD company (Russia) created an installation for measuring heat transfer (carried out by radiation) between film coatings. Measurement processing methods that allow temperature measurement with a standard deviation of 0,001 K are presented. The basic installation elements are described. The measurements carried out at the facility, necessary for calculating the emissivity, are described. A method for calculating the emissivity using the results of measurements carried out using a micro calorimeter is presented.
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Вид документа : Статья из сборника (однотомник)
Шифр издания : Описание изобретения к патенту 2324656!-539779
Автор(ы) : Абрамова, Галина Михайловна, Петраковский, Герман Антонович, Киселев, Николай Иванович, Альмухаметов, Рафаил Фазыльянович
Заглавие : Магнитный ванадиевый дисульфид хрома-меди с гигантским магнитосопротивлением .-
Коллективы : Институт физики им. Л.В. Киренского Сибирского отделения РАН, Федеральная служба по интеллектуальной собственности (Роспатент), Федеральный институт промышленной собственности
Место публикации : Изобретения. Полезные модели: офиц. бюл. Фед. службы по интеллектуал. собственности (Роспатент). - 2008. - № 14. - ISBN 2313-7436
Аннотация: Изобретение относится к разработке новых сульфидных соединений с особыми магнитоэлектрическими свойствами, которые могут быть использованы в микроэлектронике. Магнитный ванадиевый дисульфид хрома-меди с гигантским магнитосопротивлением включает серу, ванадий, хром и медь при следующем соотношении компонентов, атом.%: ванадий 0,1-3,4, хром 13,6-16,9, медь 16-17, сера 66-67. Изобретение позволяет получить вещество, обладающее высоким значением намагниченности и гигантским отрицательным магнитосопротивлением в диапазоне температур 77-160 К, 2 табл., 2 ил.Scope of invention is development of new sulphide compounds with specific magnetic and electric properties for use in microelectronics. Magnetic vanadium disulphide of chromium-copper with gigantic magnetic resistance includes sulphur, vanadium, chrome and copper with the following component ratio, atomic %: vanadium 0.1-3.4, chrome 13.6-16.9, copper 16-17, and sulphur 66-67./p p num="34"EFFECT: obtained substance possesses high intensity of magnetism and gigantic negative magnetic resistance./p p num="35"2 tbl, 2 dwg
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aronov I. E., Berman G. P., Campbell D. K., Dudiy S. V.
Заглавие : Wigner function description of ac transport through a two-dimensional quantum point contact
Разночтения заглавия :авие SCOPUS: Wigner function description of a.c. transport through a two-dimensional quantum point contact
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 1997. - Vol. 9, Is. 24. - P.5089-5103. - ISSN 0953-8984, DOI 10.1088/0953-8984/9/24/009
Примечания : Cited References: 45
Предметные 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yurkin G. Yu., Patrin G. S., Velikanov D. A., Beletsky V. V.
Заглавие : Transport properties of FeSi with cobalt impurities
Место публикации : TRENDS IN MAGNETISM. - 2011. - Vol. 168-169. - С. 493-496. - ISSN 10120394 (ISSN); 9783037850213 (ISBN), DOI 10.4028/www.scientific.net/SSP.168-169.493
Ключевые слова (''Своб.индексиров.''): iron monosilicide--kondo effect--magnetization--resistivity--spindependent scattering--superparamagnetic cluster--cobalt--crystals--electric resistance--electron energy loss spectroscopy--kondo effect--magnetic field effects--magnetic properties--magnetization--magnetoresistance--scattering--superparamagnetism--transport properties--cobalt--electric conductivity--electron scattering--impurities--kondo effect--magnetism--magnetization--experimental investigations--kondo models--magnetoresistance properties--resistivity--si crystals--spin dependent scattering--superparamagnetic clusters--crystal impurities--crystal impurities
Аннотация: The results of experimental investigations of Fe1-xCo xSi crystals in the impurity limit are presented in this article. We made an attempt to study changes of magnetic properties and conductivity in mixed Fe1-xCoxSi crystals in the impurity limit. Magnetoresistance properties are well described in the framework of Kondo model. The presence of Co-subsystem leads to the occurrence of spin-dependent channel in electron scattering conduction.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Dubrovskiy A. A., Shaykhutdinov K. A., Popkov S. I., Petrov M. I.
Заглавие : Time relaxation of residual resistance of HTSC-based composites
Место публикации : Physica C: ELSEVIER SCIENCE BV, 2007. - Vol. 460: 8th International Conference on Materials and Mechanisms of Superconductivity and High Temperature Superconductors (JUL 09-14, 2006, Dresden, GERMANY). - P1309-1310. - ISSN 0921-4534, DOI 10.1016/j.physc.2007.03.347
Примечания : Cited References: 5
Предметные рубрики: SUPERCONDUCTORS
Ключевые слова (''Своб.индексиров.''): granular htsc--resistance--relaxation--magnetic flux--granular htsc--magnetic flux--relaxation--resistance--copper oxides--crystallites--magnetic flux--magnetic relaxation--magnetization--yttrium barium copper oxides--anderson-like relaxation processes--flux trapping--residual resistance--time relaxation--josephson junction devices
Аннотация: Magnetoresistance curves R(H) and time relaxation of the residual resistance of bulk YBCO + CuO composites have been studied. These composites represent the network of Josephson junctions, where CuO acts as a barrier between YBCO grains. It has been shown that hysteresis of the R(H) dependences is related to the flux trapping within the YBCO crystallites. This flux induces magnetic field in the intergrain media. Time relaxation of the residual resistance is caused by relaxation of the magnetization of YBCO grains. The time dependence of the residual resistance obeys a logarithmic law, which describes the Anderson-like relaxation processes in the YBCO grains. (c) 2007 Elsevier B.V. All rights reserved.
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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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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Dubrovskiy A. A., Balaev D. A., Shaykhutdinov K. A., Popkov S. I., Petrov M. I.
Заглавие : The effect of magnetization relaxation of superconducting grains on time evolution of the resistance of granular HTSC in constant applied magnetic field
Коллективы : International Conference on Low Temperature Physics
Место публикации : 25 International conftrence on low temperature physics. - 2008. - С. 298
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Dubrovskiy A. A., Shaykhutdinov K. A., Popkov S. I., Petrov M. I.
Заглавие : The effect of magnetisation relaxation of superconducting grains on time relaxation of the resistance of granular HTSC in constant applied magnetic field
Место публикации : Journal of Physics: Conference Series. - 2009. - Т. 150, № 5. - С. 052012. - ISSN 1742-6588, DOI 10.1088/1742-6596/150/5/052012
ГРНТИ : 29.19
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Sadreev A. F.
Заглавие : The effect of bound states in microwave waveguides on electromagnetic wave propagation
Место публикации : Tech. Phys.: AMER INST PHYSICS, 2001. - Vol. 46, Is. 10. - P1281-1290. - ISSN 1063-7842, DOI 10.1134/1.1412064
Примечания : Cited References: 15
Предметные 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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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ma, Yibiao, Li, Siying, Wei, Jiaqi, Quan, Beibei, Liao, Weifang, Molokeev M. S., Cheng, Ming, Chen, Xiaoyan, Zhou, Zhi, Xia, Mao
Заглавие : Spectroscopically enhanced far-red phosphor Li2Mg3TiO6: Cr3+ and its application prospects to cold resistance of rice
Колич.характеристики :9 с
Место публикации : Mater. Adv. - 2023. - Vol. 4, Is. 22. - P.5808-5816. - ISSN 26335409 (eISSN), DOI 10.1039/D3MA00654A
Примечания : Cited References: 41. - This work was supported by the National Natural Science Foundation of China (Grant No. 51974123), the Key R & D Projects in Hunan Province (2021SK2047, 2022NK2044), the Natural Science Foundation of Hunan Province, China (Grant No. 2021JJ40261), Wangcheng Science and Technology Plan (KJ221017), the science and technology innovation Program of Hunan Province (2022WZ1022). The work was supported by the Ministry of Science and Higher Education of the Russian Federation as part of World-class Research Center program: “Advanced Digital Technologies”, contract no. 075-15-2020-935
Аннотация: Chemical unit co-substitution is a very effective strategy to improve the properties of phosphors. Due to the mismatch of the radii between substituted ions, unexpected properties are usually produced. Such properties are of profound significance to expand the research field. In this study, Mg2+-Ti4+ in Li2Mg3TiO6: Cr3+ was replaced by Al3+-Al3+ and Ga3+-Ga3+, while charge balance was maintained. Ion substitution changed the crystal field environment of activator ion, which increased the luminescence intensity by 180% and 184% respectively, accompanied by a slight decrease in thermal stability. In addition, the quantum efficiency was increased from 35.1% to 73.1%. The electroluminescence spectrum of the encapsulated pc-LED was examined, and the overlap with the absorption profile of the phytochrome Pfr was 61%. In order to verify the application prospect of far-red phosphor. A 15-day rice growth experiment was set up to detect surface traits, soluble sugars, soluble proteins, and the expression of OsphyA and OsCBF3 genes. It was demonstrated that rice under far-red light irradiation had significant resistance enhancement.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Dubrovskii A. A., Popkov S. I., Shaikhutdinov K. A., Petrov M. I.
Заглавие : Relaxation of the remanent resistance of granular HTSC Y-Ba-Cu-O plus CuO composites after magnetic field treatment
Разночтения заглавия :авие SCOPUS: Relaxation of the remanent resistance of granular HTSC Y-Ba-Cu-O + CuO composites after magnetic field treatment
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2008. - Vol. 50, Is. 6. - P1014-1021. - ISSN 1063-7834, DOI 10.1134/S1063783408060036
Примечания : Cited References: 24
Предметные рубрики: HIGH-TEMPERATURE SUPERCONDUCTOR
TRANSPORT CURRENT
FLUX CREEP
YBA2CU3O7-DELTA
MAGNETORESISTANCE
PENETRATION
Аннотация: The hysteresis of magnetoresistance R(H) and relaxation of the remanent resistance R-rem with time after magnetic field treatment of HTSC (Y-Ba-Cu-O) + CuO composites are studied. Such a composite constitutes a network of Josephson junctions wherein the nonsuperconducting component (CuO) forms Josephson barriers between HTSC grains. By comparing the experimental R-rem(t) and R(H) dependences, it is shown that the relaxation of the remanent resistance is caused by the decreased magnetic field in the intergrain medium due to relaxation of magnetization. The reason is uncovered for the differences between the published values of pinning potentials determined by measuring the relaxation of magnetization or resistance and fitting them by the Anderson law.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bykov A. A., Popkov S. I., Shaykhutdinov K. A., Sablina K. A.
Заглавие : Relaxation of magnetoresistance of single-crystalline (La0.5Eu0.5)0.7Pb0.3MnO3 in a pulsed magnetic field
Место публикации : Tech. Phys. Lett.: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 38, Is. 12. - P.1080-1082. - ISSN 1063-7850, DOI 10.1134/S1063785012120036
Примечания : Cited References: 8
Предметные рубрики: RESISTANCE
FILMS
Аннотация: The magnetoresistance (MR) of substituted lanthanum manganite (La0.5Eu0.5)(0.7)Pb0.3MnO3 has been measured in a pulsed magnetic field with amplitude H = 250 kOe at various temperatures. It is established that temperature dependence of the MR relaxation parameter tau(T) is correlated with temperature dependence of the electric resistance R(T). A mechanism of relaxation is proposed that is related to the relaxation of conducting and dielectric phases in the volume of a sample under the conditions of phase separation. It is shown that the behavior of tau is related to the number of phase boundaries in the volume.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shaykhutdinov K. A., Balaev D. A., Semenov S. V., Popkov S. I., Dubrovskiy A. A., Sapronova N. V., Volkov N. V.
Заглавие : Relaxation of low-temperature magnetoresistance and magnetization of polycrystalline (La0.5Eu0.5)(0.7)Pb0.3MnO3
Разночтения заглавия :авие SCOPUS: Relaxation of low-temperature magnetoresistance and magnetization of polycrystalline (La 0.5Eu 0.5) 0.7Pb 0.3MnO 3
Место публикации : J. Phys. D. - 2011. - Vol. 44, Is. 25. - Ст.255001. - ISSN 0022-3727, DOI 10.1088/0022-3727/44/25/255001
Примечания : Cited References: 34. - This work was partially supported by the Lavrentyev Competition of the Young Scientist's Projects of the Siberian Branch of the Russian Academy of Sciences, Project No 12. The authors are grateful to A D Balaev and V M Sosnin for useful discussions on the results.
Предметные рубрики: INSULATOR-METAL TRANSITION
GRANULAR FILMS
NANOPARTICLES
PR0.7CA0.3MNO3
PERCOLATION
MANGANITES
Ключевые слова (''Своб.индексиров.''): antiferromagnetic boundaries--characteristic value--ferromagnetic domains--ferromagnetic metal--lanthanum manganites--logarithmic law--low temperatures--magneto-resistive effect--polycrystalline--relative orientation--relaxation of magnetization--temperature fluctuation--time evolutions--time interval--tunnel magnetoresistance--antiferromagnetism--electric resistance--europium--ferromagnetic materials--ferromagnetism--grain boundaries--grain size and shape--lanthanum compounds--lead--magnetic domains--magnetic moments--magnetoelectronics--magnetoresistance--manganese oxide--magnetization
Аннотация: Hysteresis and relaxation of magnetoresistance and magnetization of substituted (La0.5Eu0.5)(0.7)Pb0.3MnO3 lanthanum manganite in a low-temperature region ( 40 K) are investigated. It is shown that at these temperature features of the magnetoresistive effect are determined mainly by spin-dependent tunnelling of carriers via insulating grain boundaries. As was demonstrated previously, the grain boundaries may be antiferromagnetically ordered. Therefore, relaxation of magnetization and resistance is determined by the processes of relative orientation of the magnetic moments of ferromagnetic domains neighbouring the antiferromagnetic boundary of ferromagnetic domains under the action of temperature fluctuations. It is shown that relaxation follows the logarithmic law within the time interval t similar to 10(2)-3x10(3) s. A comparison between time evolutions of the magnetic moment and resistance shows that magnetoresistance and magnetization are related as delta R
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev A. D., Gavrichkov V. A., Ovchinnikov S. G.
Заглавие : Quantum oscillations of resistance and magnetization in the degenerate semiconductor n-HgCr2Se4
Место публикации : J. Exp. Theor. Phys.: AMER INST PHYSICS, 1998. - Vol. 86, Is. 5. - P1026-1029. - ISSN 1063-7761, DOI 10.1134/1.558549
Примечания : Cited References: 6
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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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Dubrovskiy A. A., Shaykhutdinov K. A., Popkov S. I., Petrov M. I.
Заглавие : Peculiarities of the time evolution of magnetoresistance of granular HTSC in a constant applied magnetic field
Коллективы :
Место публикации : Solid State Commun. - 2008. - Vol. 147, Is. 7-8. - P.284-287. - ISSN 0038-1098, DOI 10.1016/j.ssc.2008.05.044
Примечания : Cited References: 17. - This work was Supported by program "Quantum macrophysics" No. 3.4 of RAS and integration project No. 3.4 of SB RAS and in part by KSF, grant 18G011. D.A.B. and A.A.D. acknowledge the Russian Science Support Foundation.
Предметные рубрики: CRITICAL-STATE
SUPERCONDUCTORS
COMPOSITES
HYSTERESIS
RESISTANCE
Ключевые слова (''Своб.индексиров.''): superconductors--flux pinning and creep--tunneling--superconductors--flux pinning and creep--tunneling--agricultural products--carbon fiber reinforced plastics--copper oxides--electric conductivity--electric resistance--evolutionary algorithms--ferromagnetism--galvanomagnetic effects--grain (agricultural product)--health--hysteresis--magnetic devices--magnetic field effects--magnetic field measurement--magnetic fields--magnetic materials--magnetoelectronics--magnetoresistance--semiconductor metal boundaries--superconducting magnets--superconductivity--yttrium barium copper oxides--p ,p ,t measurements--applied (co)--applied magnetic fields--constant magnetic field (cmf)--elsevier (co)--evolution (co)--external fields--field induced--flux creep--hysteretic behavior--josephson couplings--low magnetic fields--magnetic (ce)--poly crystalline--superconducting grains--time evolutions--time relaxation--magnetism
Аннотация: The time evolution of the magnetoresistance of bulk YBCO + CuO composites at T = 4.2 K in constant applied magnetic fields was studied to clarify the mechanism of hysteretic behavior of magnetoresistance R(H) of granular HTSC. The composites represent "model" granular HTSC with weakened Josephson coupling between superconducting (YBCO) crystallites. It was found for the first time that on the ascending branch of R(H) dependence, the resistance at H = const decreased with time while on the descending branch, the resistance increased with time in ail applied constant magnetic field. In the range of low magnetic fields (below the minimum point of the descending branch of the R(H) dependence), the resistance at H const decreased again. Similar measurements performed oil pure polycrystalline YBCO at T = 77.4 K have shown that the behavior of evolution of resistance with time is similar to that observed for the composite. This proves the peculiarity of time evolution of maignetoresistance to be a common feature of granular HTSCs. The behavior revealed is well described by the model Of granular HTSC, where the intergrain media is in an effective magnetic field which is the superposition of the external field and the field induced by superconducting grains. The time evolution of resistance reflects the time relaxation of magnetization of HTSC grains due to the intragrain flux Creep Processes. (C) 2008 Elsevier Ltd. All rights reserved.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volkov N. V., Lee C. G., Kim P. D., Eremin E. V., Patrin G. S.
Заглавие : Optically driven conductivity and magnetoresistance in a manganite-based tunnel structure
Коллективы : Russian Foundation for Basic Research [08-02-00259-a, 08-02-00397-a]; Division of Physical Sciences of the RAS; [2.4.2]
Место публикации : J. Phys. D. - 2009. - Vol. 42, Is. 20. - Ст.205009. - ISSN 0022-3727, DOI 10.1088/0022-3727/42/20/205009
Примечания : Cited References: 13. - This study was supported by the Russian Foundation for Basic Research (Projects Nos 08-02-00259-a and 08-02-00397-a) and the Division of Physical Sciences of the RAS, Programme 'Spin-dependent Effects in Solids and Spintronics' (Project No 2.4.2 of the Siberian Branch of the RAS).
Предметные рубрики: JUNCTIONS
Ключевые слова (''Своб.индексиров.''): conducting layers--current-in-plane geometry--dielectric layer--electron hole pairs--interband absorption--magnetic tunnel junction--magnetic tunnels--multilayer structures--optical radiations--photoinduced change--potential barriers--radiation power density--threshold characters--tunnel structures--electric resistance--lanthanum--light--magnetic field effects--magnetoelectronics--magnetoresistance--manganese compounds--oxide minerals--photovoltaic effects--semiconductor junctions--transport properties--vehicular tunnels--wind tunnels--tunnel junctions
Аннотация: In the multilayer structure, La(0.7)Sr(0.3)MnO(3)/depleted manganite layer/MnSi, the photovoltaic effect has been discovered. The depleted manganite layer in the structure is dielectric and serves as a potential barrier between the ferromagnetic conducting La(0.7)Sr(0.3)MnO(3) and MnSi layers by the formation of a magnetic tunnel junction. The photoinduced changes in the transport properties of the magnetic tunnel structure have been observed in the current-in-plane geometry. The changes are reversible and saturate at radiation power densities over 30 mW cm(-2). The photovoltaic effect has a threshold character: it reveals only at h nu 1.17 eV. Most likely, the effect of optical radiation is related to the formation of electron-hole pairs due to interband absorption of light in the dielectric layer. A photocurrent through the tunnel junctions separating the conducting layers causes a redistribution of the current channels between the conducting layers, which influences the conductivity and the magnetoresistance of the structure.
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20.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Shaykhutdinov K.A., Popkov S.I., Balaev D.A., Dubrovskiy A.A., Semenov S.V., Bykov A.A., Sapronova N.V., Sablina K.A., Volkov N.V.
Заглавие : Observation of negative differential resistance on CVCs of single crystalline (La0.5Eu0.5)0.7Pb0.3MnO3
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Уральское отделение РАН
Место публикации : IV Euro-Asian Symposium "Trends in MAGnetism" Nanospintronics (EASTMAG-2010). School for young scientist "Spintronics": June 28 - Lule 2, 2010"Book of abstracts. - Ekaterinburg, 2010. - P.249
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