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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) : Altin E., Gokhfeld D. M., Demirel S., Oz E., Kurt F., Altin S., Yakinci M.E.
Заглавие : Vortex pinning and magnetic peak effect in Eu(Eu,Ba)2.125Cu3Ox
Место публикации : J. Mater. Sci.-Mater. Electron.: Springer, 2014. - Vol. 25, Is. 3. - P.1466-1473. - ISSN 0957-4522, DOI 10.1007/s10854-014-1753-1. - ISSN 1573-482X
Примечания : Cited References: 30
Предметные рубрики: SUPERCONDUCTORS
FIELD
NANOCRYSTALLINE
TEMPERATURE
LOOP
Аннотация: Eu–Ba–Cu–O composition was synthesized by solid state reaction technique. To determine optimum growth temperature, heat treatment was examined on the material at 880–1,100 °C. Microstructural evolution, phase formation and elemental distribution depending on heat treatments were examined by using X-ray diffraction, scanning electron microscope, energy dispersive X-ray spectroscope analysis. Optimum fabrication conditions were determined as 1,020 °C for 24 h under oxygen atmosphere and detailed characterization of corresponding compound was performed. The magnetization hysteresis loops are expounded to be the product of superconducting Eu-123 grains and magnetic Eu2+ ions. The peak effect on the magnetization curves was described by the extended critical state model. Scaling of the pinning force was found such that the peak position is proportional to the irreversibility field H irr and the maximum pinning force is proportional to H irr 2 .
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Balaev A. D.
Заглавие : Tunnel Conductivity and Tunnel Magnetoresistance of the Fe-SiO Films: Interplay of the Magnetotransport and Magnetic Properties
Место публикации : Phys. Solid State. - 2019. - Vol. 61, Is. 7. - P.1203-1210. - ISSN 1063-7834, DOI 10.1134/S1063783419070047. - ISSN 1090-6460(eISSN)
Примечания : Cited References: 48
Предметные рубрики: GIANT MAGNETORESISTANCE
GRANULAR FILMS
TEMPERATURE
TRANSPORT
Аннотация: The electrical properties of a system of nanogranular amorphous Fe–SiO films with a SiO concentration between 0 and 92 vol % have been investigated. The samples with a low SiO content are characterized by the metal-type conductivity. With an increase in the dielectric content x in the films, the concentration transition from the metal to tunneling conductivity occurs at x ≈ 0.6. At the same concentration, the ferromagnet–superparamagnet transition is observed, which was previously investigated by the magnetic method. The temperature dependences of the electrical resistivity ρ(T) for the compositions corresponding to the dielectric region obey the law ρ(T) ~ exp(2(C/kT)1/2), which is typical of the tunneling conductivity. The estimation of the metal grain sizes from the tunneling activation energy C has shown good agreement with the sizes obtained previously by analyzing the magnetic properties. In the dielectric region of the compositions, the giant magnetoresistive effect attaining 25% at low temperatures has been obtained.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Onufrienok V. V., Chzhan A. V., Bondarenko G. V., Yurkin G. Yu.
Заглавие : Transition of metastable pyrrhotites to a stable phase state
Место публикации : Inorg. Mater. - 2020. - Vol. 56, Is. 9. - P.898-902. - ISSN 0020-1685, DOI 10.1134/S0020168520090137. - ISSN 1608-3172(eISSN)
Примечания : Cited References: 23
Предметные рубрики: MAGNETIC-PROPERTIES
TEMPERATURE
CHEMISTRY
Аннотация: Equilibrium phase relations of synthetic minerals prepared by annealing metastable iron sulfides, followed by prolonged isothermal storage in the Earth atmosphere, have been studied by X-ray diffraction. The results demonstrate that prolonged storage of synthetic pyrrhotites annealed at different temperatures makes it possible to identify metastable and stable phases of Fe and S compounds.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volkov N. V., Eremin E. V., Shaykhutdinov K. A., Tsikalov V. S., Petrov M. I., Balaev D. A., Semenov S. V.
Заглавие : The magnetic-field-driven effect of microwave detection in a manganite granular system
Место публикации : J. Phys. D. - 2008. - Vol. 41, Is. 1. - Ст.15004. - ISSN 0022-3727, DOI 10.1088/0022-3727/41/1/015004
Примечания : Cited References: 24
Предметные рубрики: IDENTICAL METALS
TUNNEL-JUNCTIONS
MAGNETORESISTANCE
RECTIFICATION
SPINTRONICS
TEMPERATURE
PEROVSKITES
Ключевые слова (''Своб.индексиров.''): bias currents--curie temperature--electric power generation--granular materials--magnetic field effects--microwave irradiation--voltage measurement--direct current voltage--magnetic tunnel junctions--metal insulator metal junctions--nonmagnetic metals--manganites
Аннотация: We demonstrate the microwave detection effect in a granular La0.7Ca0.3MnO3 sample. Dc voltage generated by the sample in response to microwave irradiation below the Curie temperature is found to be dependent on the applied magnetic field. The magnetic field dependence of the dc voltage has a broad peak resembling an absorption line. The detection effect depends substantially on the magnetic history of the sample; however, identical measurement conditions provide reproducibility of the experimental results. The detected dc voltage increases linearly with microwave power and strongly depends on a bias current through the sample. According to the results of systematic measurements, there exist two contributions to a value of the detected output signal. The first is magneto-independent; it can be explained in the framework of a mechanism used traditionally for description of the rectification effect in metal-insulator-metal junctions with nonmagnetic metals. The other is magneto-dependent; it originates from the interplay between the spin-dependent current through magnetic tunnel junctions and spin dynamics of the grains, which form these junctions in the sample.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavrichkov V. A., Ovchinnikov S. G.
Заглавие : The band structure of n-type cuprate superconductors with the T '(T) structure taking into account strong electron correlation
Разночтения заглавия :авие SCOPUS: The band structure of n-type cuprate superconductors with the T′(T) structure taking into account strong electron correlation
Место публикации : J. Exp. Theor. Phys.: AMER INST PHYSICS, 2004. - Vol. 98, Is. 3. - P556-564. - ISSN 1063-7761, DOI 10.1134/1.1705708
Примечания : Cited References: 18. - This work was financially supported by the Russian Foundation for Basic Research (project no. 03-02-16124), RFFI-KKFN “Eniseœ” (project no. 02-02-97705), INTAS (project no. 01-0654), integration program of URO and Siberian Division, Russian Academy of Sciences
Предметные рубрики: QUASI-PARTICLES
COPPER OXIDES
TEMPERATURE
LA2-XSRXCUO4
ND2-XCEXCUO4
EVOLUTION
MOMENTS
Ключевые слова (''Своб.индексиров.''): dielectric properties--electric conductance--electron transitions--electronic structure--fermi level--phase diagrams--semiconductor doping--conduction bands--electron correlation--spectral density--superconducting materials
Аннотация: The spectral density, dispersion relations, and the position of the Fermi level for n-doped compositions based on NCO and LCO were calculated within the framework of the generalized tight binding method. As distinguished from LCO, the dielectric gap in NCO is nonlinear in character. We observe a virtual level both at the bottom of the conduction band and at the top of the valence band in both compounds. However, its position corresponds to the extreme bottom of the conduction band in LCO and is 0.1 - 0.2 eV above the bottom in NCO. This explains why we observe Fermi level pinning in n-LCO as the concentration of the doping component grows and reproduce its absence in NCCO at low doping values. We also found both compositions to be unstable in a narrow concentration range with respect to a nonuniform charge density distribution. The relation between the phase diagram for NCCO and the calculated electronic structure is discussed. (C) 2004 MAIK "Nauka/Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Drokina T. V., Petrakovskii G. A., Molokeev M. S., Bondarev V. S., Velikanov D. A.
Заглавие : Synthesis and study of structural, thermodynamic, and magnetic properties of NaxLi1–xFeGe2O6 (x = 0.1–0.9) compounds
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2016. - Vol. 58, Is. 7. - P.1361-1370. - ISSN 10637834 (ISSN), DOI 10.1134/S1063783416070143
Примечания : Cited References: 20
Предметные рубрики: CLINOPYROXENE-TYPE LiFeGe2O6
PHASE-TRANSITION
PYROXENES
TEMPERATURE
LiFeSi2O6
CRYSTAL
Аннотация: The properties of NaxLi1–xFeGe2O6 (x = 0.1–0.9) solid solutions obtained via a solid-phase synthesis have been measured by X-ray diffraction, calorimetry, and magnetic method. The order–disorder transformations in low-dimensional NaxLi1–xFeGe2O6 (x = 0.1–0.9) spin systems with predominately antiferromagnetic exchange interaction have been revealed in the low-temperature susceptibility dependences. The study of thermal and physical properties has confirmed that substituting the sodium ions with the lithium ones induces the first-order structural phase transitions of the displacement type which are characterized by a symmetry change in monoclinic crystals from high-temperature C2/c space group to low-temperature P21/c space group. © 2016, Pleiades Publishing, Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Atuchin V. V., Gavrilova T. A., Isaenko L. I., Kesler V. G., Molokeev M. S., Zhurkov S. A.
Заглавие : Synthesis and structural properties of cubic G0-Rb2KMoO3F3 oxyfluoride
Место публикации : Ceram. Int.: Elsevier, 2012. - Vol. 38, Is. 3. - P.2455-2459. - ISSN 0272-8842, DOI 10.1016/j.ceramint.2011.11.013
Примечания : Cited References: 23. - This study was partly supported by RFBR (Grant 09-02-00062) and SB RAS (Grant 34).
Предметные рубрики: PHASE-TRANSITIONS
FERROELECTRIC K3WO3F3
(NH4)(3)MOO3F3
TEMPERATURE
PEROVSKITE
ELPASOLITE
CRYSTALS
BEHAVIOR
High temperature
Melt solidification
Micromorphologies
Melt solidification
Microstructure-final
Oxyfluorides
Space Groups
Oxyfluorides
X ray methods
Ключевые слова (''Своб.индексиров.''): powders: solid state reaction--microstructure-final--x-ray methods--alkali oxides--halides
Аннотация: High-temperature G0 polymorph of Rb2KMoO3F3 has been prepared by melt solidification. Micromorphology and chemical properties of the final product were evaluated by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The elpasolite-related crystal structure of G0-Rb2KMoO3F3 has been refined by Rietveld method at T = 298 K (space group Fm-3m, a = 8.92446(8) Å, V = 710.76(1) Å3; RB = 3.55%). Ferroelectric G1-Rb2KMoO3F3 polymorph, earlier reported at T˂328 K, is not found at T = 298 K.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Atuchin V. V., Yelisseyev A. P., Galashov E. N., Molokeev M. S.
Заглавие : Synthesis and luminescence properties of Li2O–Y2O3–TeO2:Eu3+ tellurite glass
Коллективы : Ministry of Education and Science of the Russian Federation
Место публикации : Mater. Chem. Phys.: Elsevier Science, 2014. - Vol. 147, Is. 3. - P.1191-1194. - ISSN 0254-0584, DOI 10.1016/j.matchemphys.2014.07.003. - ISSN 1879-3312
Примечания : Cited References: 26. - This study is partly supported by the Ministry of Education and Science of the Russian Federation.
Предметные рубрики: LIGHT-EMITTING-DIODES
SPECTROSCOPIC PROPERTIES
OPTICAL-PROPERTIES
ENERGY-TRANSFER
CERAMICS
Eu3+
PHOTOLUMINESCENCE
TEMPERATURE
EMISSION
PHOSPHOR
Ключевые слова (''Своб.индексиров.''): glasses--heat treatment--photoluminescence spectroscopy--optical properties
Аннотация: The Eu3+-doped red-orange emitting phosphor of tellurite glass 0.25Li2O–0.20Y2O3–0.5TeO2–0.05Eu2O3 has been synthesized by the melt quenching method. The amorphous nature of the glass has been verified by XRD measurements. The photoluminescence excitation and emission spectra, the luminescence decay curves have been investigated for the composition. The phosphor can be efficiently excited by the near UV light to realize the intense narrow red emission line (611 nm) corresponding to forced electric dipole transition 5D0 → 7F2 of Eu3+ ions. The Li2O–Y2O3–TeO2:Eu3+glass phosphor is a potential red-orange emitting candidate for the application in WLEDs.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Khrustalev B. P., Balaev A. D., Sosnin V. M.
Заглавие : Superparamagnetism in Fe-SiO nanocluster films
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1995. - Vol. 37, Is. 6. - P.1676-1686. - ISSN 0367-3294
Примечания : Cited References: 30
Предметные рубрики: ELECTRICAL-PROPERTIES
TEMPERATURE
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