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A comparative study of transport properties of composites HTSC+MgTiO3 and HTSC + NiTiO3. The effect of paramagnetic NiTiO3 / M. I. Petrov, D. A. Balaev, K. A. Shaikhutdinov, K. S. Aleksandrov // Physica C-Superconductivity and its Applications. - 2000. - Vol. 341-348, Pt. 3. - P. 1863-1864, DOI 10.1016/S0921-4534(00)01217-X . - ISSN 0921-4534
Кл.слова (ненормированные):
Composite materials -- Copper oxides -- Josephson junction devices -- Magnesium compounds -- Nickel compounds -- Paramagnetism -- Superconductivity -- Thermal effects -- Transport properties -- Yttrium compounds -- Abrikosov vortices flow -- Superconductor insulator superconductor junction -- Thermally activated phase slippage -- High temperature superconductors
Аннотация: Bulk composites Y3/4Lu1/4Ba2Cu3O7+NiTiO3 and Y3/4Lu1/4Ba2Cu3O7+MgTiO3 with insulator volume content 7.5% and 15% modelling a network of Superconductor-Insulator-Superconductor (S-I-S) junctions have been prepared. The ?(T) dependences of composites HTSC+MgTiO3 are described well by the mechanism of Thermally Activated Phase Slippage (TAPS). The anomalous behavior of resistivity ?(T) of HTSC+NiTiO3 composites manifesting as a kink on ?(T) curves at some temperature Tm have been observed. In the temperature range Tm < T < TC the dissipation is Ohmic while below Tm the CVCs are strongly non-linear. This peculiarity is interpreted as arisen owing to Abrikosov vortices flow.

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Доп.точки доступа:
Petrov, M. I.; Петров, Михаил Иванович; Balaev, D. A.; Балаев, Дмитрий Александрович; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; International conference on materials and mechanisms of superconductivity high temperature superconductors(6 ; 2000 ; Feb. ; 20-25 ; Houston, Texas, USA)
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Zhandun, V. S.
Ab initio comparative study of the magnetic, electronic and optical properties of AB2O4 (A, B= Mn, Fe) spinels / V. S. Zhandun, A. V. Nemtsev // Mater. Chem. Phys. - 2021. - Vol. 259. - Ст. 124065, DOI 10.1016/j.matchemphys.2020.124065. - Cited References: 32. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research project № 19-42-240016: «Control of structural, magnetic, electronic, and optical properties by pressure and intercalation into functional compounds with a spinel structure containing 3d and 4f ions » The calculations were performed with the computer resources of “Complex modeling and data processing research installations of mega-class” SRC “Kurchatovsky Institute” (http://ckp.urcki.ru) . - ISSN 0254-0584. - ISSN 1879-3312
Кл.слова (ненормированные):
Ab initio calculations -- Spinel -- Magnetic and electronic properties -- Optical properties -- Inverse structure -- Manganese and iron oxides
Аннотация: The comparison of the magnetic, electronic, and optical properties of the spinel transition-metal oxides AB2O4 (A, B = Fe, Mn) and their relationship with the structure and composition were studied within DFT-GGA + U approximation. The spinels were considered both in the normal and inverse structure. We have found that regardless of composition and structure, the studied spinels are ferrimagnetic with antiparallel magnetic moments on A- and B-site cations. Electronic and structural properties of spinels depend on the composition: FeMn2O4 has a tetragonal structure and half-metallic properties; however, in the inverse FeMn2O4, the bandgap opens for the spin-up channel. MnFe2O4 is a cubic insulator with a bandgap of about 1.5 eV, which decreases in the inverse structure. The superexchange constants estimate within the simple indirect coupling model and have values close to the experimental ones. The total magnetization of FeMn2O4 is drop-down to zero under hydrostatic pressure above 60 GPa due to the strong dependence of the magnetic moment of octahedral manganese ion on the pressure. The microscopic mechanisms of the relationship between the structure, composition and properties are studied.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center, Krasnoyarsk Science Centre, Siberian Branch of the Russian Academy of Sciences, 660036, Krasnoyarsk, Russia

Доп.точки доступа:
Nemtsev, A. V.; Немцев, А. В.; Жандун, Вячеслав Сергеевич
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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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    Caloric Effects in Some Ferroelectric and Ferroelastic Fluorides, Oxyfluorides and Oxides / I. N. Flerov [et al.] // Joint 13th Russia/CIS/Baltic/Japan Symp. on Ferroelectricity and Int. Workshop on Relaxor Ferroelectrics (RCBJSF-IWRF 2016) : book of abstracts. - 2016. - Ст. Invite-6. - References: 4. - The reported study was partially supported by RFBR, research project No. 15-02-02009 a
   Перевод заглавия: Калорические эффекты в некоторых сегнетоэлектрических и сегнетоэластических фторидах, оксифторидах и оксидах

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Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Mikhaleva, E. A.; Михалева, Екатерина Андреевна; Kartashev, A. V.; Карташев, Андрей Васильевич; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Russia/CIS/Baltic/Japan Symposium on Ferroelectricity(13 ; 2016 ; Jun. ; 19-23 ; Matsue, Japan); International Workshop on Relaxor Ferroelectrics(2016 ; Jun. ; 19-23 ; Matsue, Japan)
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    Characterization of the iron oxide phases formed during the synthesis of core-shell FexOy@C nanoparticles modified with Ag / D. A. Petrov, C. R. Lin, R. D. Ivantsov [et al.] // Nanotechnology. - 2020. - Vol. 31, Is. 39. - Ст. 395703, DOI 10.1088/1361-6528/ab9af2. - Cited References: 46. - The reported study was funded by Joint Research Project of Russian Foundation for Basic Research № 19-52-52002 and Ministry of Science and Technology, Taiwan MOST № 108-2923-M-153-001-MY3 and № 106-2112-M-153-001-MY3. The samples of series 1 were studied with the support of the Ministry of Science and Higher Education of the Russian Federation within the State assignment FSRC «Crystallography and Photonics» RAS. The electron microscopy investigations were conducted in the SFU Joint Scientific Center supported by the State assignment (#FSRZ-2020-0011) of the Ministry of Science and Higher Education of the Russian Federation . - ISSN 1361-6528
   Перевод заглавия: Идентификация фаз оксида железа, формирующихся в процессе синтеза наночастиц FexOy@C с морфологией ядро-оболочка, модифицированных Ag
Кл.слова (ненормированные):
core–shell nanoparticles -- iron oxides -- carbon shell -- Ag nanoparticles
Аннотация: Core–shell FexOy@C nanoparticles (NPs) modified with Ag were studied with x-ray diffraction, transmission electron microscopy, energy dispersive elemental mapping, Mössbauer spectroscopy, static magnetic measurements, and optical magnetic circular dichroism (MCD). FexOy@C NPs synthesized by the pyrolysis process of the mixture of Fe(NO3)3 centerdot 9H2O with oleylamine and oleic acid were added to a heated mixture of oleylamine and AgNO3 in different concentrations. The final product was a mixture of iron oxide crystalline NPs in an amorphous carbon shell and Ag crystalline NPs. The iron oxide NPs were presented by two magnetic phases with extremely close crystal structures: Fe3O4 and γ-Fe2O3. Ag is shown to form crystalline NPs located very close to the iron oxide NPs. An assumption is made about the formation of hybrid FexOy@C-Ag NPs. Correlations were obtained between the Ag concentration in the fabricated samples, their magnetic properties and the MCD spectrum shape. Introducing Ag led to a approximately linear decrease of the NPs saturation magnetization depending upon the Ag concentration, it also resulted into the MCD spectrum shift to the lower light wave energies. MCD was also studied for the Fe3O4@C NPs synthesized earlier with the same one-step process using different heat treatment temperatures, and MCD spectra were compared for two series of NPs. A possible contribution of the surface plasmon excitation in Ag NPs to the MCD spectrum of the FexOy@C-Ag NPs is discussed.

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Держатели документа:
Kirensky Institute of Physics, FRC, KSC, SB RAS, Krasnoyarsk 660036, Russia
National Pingtung University, Pingtung City, Pingtung County 90003, Taiwan
Siberian Federal University, Svobodny Av., 79, Krasnoyarsk 660041, Russia
Shubnikov Institute of Crystallography of FSRC 'Crystallography and Photonics' RAS, Moscow 119333, Russia

Доп.точки доступа:
Petrov, D. A.; Петров, Дмитрий Анатольевич; Lin, C. R.; Ivantsov, R. D.; Иванцов, Руслан Дмитриевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Zharkov, S. M.; Жарков, Сергей Михайлович; Yurkin, G. Yu.; Юркин, Глеб Юрьевич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Knyazev, Yu. V.; Князев, Юрий Владимирович; Molokeev, M. S.; Молокеев, Максим Сергеевич; Tseng, Y. T.; Lin, E. S.; Edelman, I. S.; Эдельман, Ирина Самсоновна; Baskakov, A. O.; Starchikov, S. S.; Lyubutin, I. S.
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Co nanoparticles in Si oxides: magnetoopical spectra [Text] / Edelman I., Ivantsov R. [и др.] // Moscow Int. Symp. on Magnet. (MISM-2008) : June 20-25, 2008, Moscow : book of abstract. - 2008. - p. 310. - Библиогр.: 1. - Support of RFBR (07-02-93174, 07-03-00320) is acknowledged

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Доп.точки доступа:
Edelman, I. S.; Эдельман, Ирина Самсоновна; Ivantsov, R. D.; Иванцов, Руслан Дмитриевич; Vorotynova, O.V.; Petrov, D. A.; Seredkin, V. A.; Середкин, Виталий Александрович; Valeev, V. F.; Khaibullin, R. I.; Stepanov, A.; Moscow International Symposium on Magnetism(4 ; 2008 ; Jun. ; Moscow); Московский государственный университет им. М.В. Ломоносова; Российский фонд фундаментальных исследований
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Combined method of removing the natural oxide silicon / A. V. Kobyakov [et al.] // VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016) : abstracts / ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk : KIP RAS SB, 2016. - Ст. P11.3. - P. 535 . - ISBN 978-5-904603-06-9
Кл.слова (ненормированные):
surface -- oxides -- high-frequency plasma

Доп.точки доступа:
Kobyakov, A. V.; Кобяков, Александр Васильевич; Yushkov, V. I.; Юшков, Василий Иванович; Rautskii, M. V.; Рауцкий, Михаил Владимирович; Volochaev, M. N.; Волочаев, Михаил Николаевич; Patrin, G. S.; Патрин, Геннадий Семёнович; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН

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Ovchinnikov, S. G.
Comparison of electronic structure, magnetic mechanism, and symmetry of pairing in ruthenates and cuprates / S. G. Ovchinnikov ; ed. C Noce [et al.] // Ruthenate and rutheno-cuprate materials: unconventional superconductivity, magnetism and quantum phase transitions. Ser. lecture notes in physics : Springer Verlag, 2002. - Vol. 603: International Conference on Ruthenate and Rutheno-Cuprate Materials (OCT 25-27, 2001, VIETRI SUL MARE, ITALY). - P. 239-255. - Cited References: 48 . - ISBN 0075-8450. - ISBN 3-540-44275-8

РУБ Physics, Multidisciplinary + Physics, Condensed Matter
Рубрики:
METAL-INSULATOR-TRANSITION
   SUPERCONDUCTOR SR2RUO4
   LAYERED PEROVSKITE
   BAND-STRUCTURE
   CORRELATED ELECTRONS
   MOTT TRANSITION
   COPPER OXIDES
   HUBBARD-MODEL
   RUSR2GDCU2O8
   CA2-XSRXRUO4
Аннотация: A generalized tight-binding (GTB) method is developed to calculate quasi-particle band structure with explicit account for strong electronic correlations. The GTB method combines exact diagonalization of the multi-orbital P-d model Hamiltonian within the unit cell and the perturbation theory in the Hubbard X-operators form for the inter-cell hopping and interactions. For undoped cuprates we obtain the valence band structure in excellent agreement with ARPES data, evolution of the band structure with doping with an in-gap state at small doping, impurity-like band at higher doping to optimally doped metal. The effective low-energy Hamiltonian has the form of singlet-triplet t-J model. For ruthenates the t-J-I model is proposed with both antiferromagnetic J and ferromagnetic I couplings. In the strong correlation limit, the mean-field theory of superconductivity results in d-wave singlet pairing mediated by J (cuprates) and p-wave triplet one mediated by I (ruthenates) with ratio T-c((d))/T-c((p)) similar to 100 due to the different symmetry of the gap. The competition of ferromagnetic and antiferromagnetic order in rutheno-cuprates is also discussed.

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

Доп.точки доступа:
Noce, C \ed.\; Vecchione, A \ed.\; Cuoco, M \ed.\; Cuoco, \ed.\; Овчинников, Сергей Геннадьевич
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Kuz'min, E. V.
Comparison of superconductivity in Sr2RuO4 and copper oxides / E. V. Kuz'min, S. G. Ovchinnikov, I. O. Baklanov // Phys. Rev. B. - 2000. - Vol. 61, Is. 22. - P. 15392-15397, DOI 10.1103/PhysRevB.61.15392. - Cited References: 21 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
T-J MODEL
   HUBBARD-MODEL
   LAYERED PEROVSKITE
   ELECTRONS
Аннотация: To compare the superconductivity in strongly correlated electron systems with the antiferrornagnetic fluctuations in the copper oxides and with the ferromagnetic fluctuations in Sr2RuO4 a t-J-l model is proposed. The antiferromagnetic coupling J results in the superconducting state of d(x2-y2) symmetry and the ferromagnetic coupling I results in the spin-triplet p-type state. The difference in the gap anisotropies provides the large difference in T-c values, for the typical values of the coupling constants: T-c similar to 1 K for the ruthenste and T-c similar to 100 K for the cuprates.

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Держатели документа:
Krasnoyarsk State Univ, Krasnoyarsk 660062, Russia
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Baklanov, I. O.
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10.

Conditions for diamond and graphite formation from iron carbide at the P-T parameters of lithospheric mantle / Y. V. Bataleva [et al.] // Russ. Geol. Geophys. - 2016. - Vol. 57, Is. 1 : Tectonics, geodynamics, and petrology of earth’s lithosphere and mantle (to the 80th birthday of Academician Nikolai Leontievich Dobretsov). - P. 176-189, DOI 10.1016/j.rgg.2016.01.012. - Cited References:55. - This work was supported by the Russian Science Foundation under Grant No. 14-27-00054. . - ISSN 1068-7971. - ISSN 1878-030X

РУБ Geosciences, Multidisciplinary
Рубрики:
DEEP CARBON-CYCLE
   EARTHS MANTLE
   MINERAL INCLUSIONS
   HIGH-PRESSURE
   KOKCHETAV MASSI
   SUBDUCTION ZONES
   REDOX BUDGET
   FERRIC IRON
   MOSSBAUER
   METAL
Кл.слова (ненормированные):
iron carbide -- wusite -- graphite -- diamond -- oxides -- olivine -- subduction -- redox interaction -- lithospheric mantle -- high-pressure experiment
Аннотация: To estimate conditions for the stability of iron carbide under oxidation conditions and to assess the possibility of formation of elemental carbon by interaction between iron carbide and oxides, experimental modeling of redox interaction in the systems Fe3C-Fe2O3 and Fe3C-Fe2O3-MgO-SiO2 was carried out on a split-sphere high-pressure multianvil apparatus at 6.3 GPa and 900-1600 degrees C for 18-20 h. During carbide-oxide interaction in the system Fe3C-Fe2O3, graphite crystallizes in assemblage with Fe3+-containing wusite. Graphite forms from carbide carbon mainly by cohenite oxidation: Fe3C + 3Fe(2)O(3) -> 9FeO + C-0 and FeO + Fe3C -> (Fe2+, Fe3+)O + C-0. At above-solidus temperatures (>= 1400 degrees C), when metal-carbon melt is oxidized by wusite, graphite and diamond crystallize by the redox mechanism and form the Fe3+-containing wstite + graphite/diamond assemblage. Interaction in the system Fe3C-Fe2O3-MgO-SiO2 results in the formation of Fe3+-containing mannesiowusite-olivine-graphite assemblage. At >= 1500 degrees C, two melts with contrasting f(O2) values are generated: metal-carbon and silicate-oxide; their redox interaction leads to graphite crystallization and diamond growth. Under oxidation conditions, iron carbide is unstable in the presence of iron, silicon, and magnesium oxides, even at low temperatures. Iron carbide-oxide interaction at the mantle temperatures and pressures leads to the formation of elemental carbon; graphite is produced from carbide carbon mainly by redox reactions of cohenite (or metal-carbon melt) with Fe2O3 and FeO as well as by interaction between metal-carbon and silicate-oxide melts. The results obtained suggest that cohenite can be a potential source of carbon during graphite (diamond) formation in the lithospheric mantle and the interaction of iron carbide with iron, silicon, and magnesium oxides, during which carbon is extracted can be regarded as a process of the global carbon cycle. (C) 2016, V.S. Sobolev IGM, Siberian Branch of the RAS. Published by Elsevier B.V. All rights reserved.

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Публикация на русском языке Условия образования графита и алмаза из карбида железа при Р, Т-параметрах литосферной мантии [Текст] / Ю. В. Баталева [и др.] // Геол. и геофиз. - 2016. - Т. 57 № 1. - С. 225-240

Держатели документа:
Russian Acad Sci, Siberian Branch, VS Sobolev Inst Geol & Mineral, Pr Akad Koptyuga 3, Novosibirsk 630090, Russia.
Novosibirsk State Univ, Ul Pirogova 2, Novosibirsk 630090, Russia.
Russian Acad Sci, Siberian Branch, LV Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Bataleva, Yu. V.; Palyanov, Yu. N.; Borzdov, Yu. M.; Bayukov, O. A.; Баюков, Олег Артемьевич; Sobolev, N. V.; Russian Science Foundation [14-27-00054]
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