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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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    A set of Majorana zero modes on the triangular lattice in the coexistence phase of superconductivity and noncollinear magnetic order / V. V. Val'kov [et al.] // The 15th Days of the Condensed Matter (JMC'15) : abstracts. - 2016. - P. 45. - References: 4. - This study was funded by RFBR in part according to the research project No. 16-02-00073-a. A.O.Z. is grateful for support of the Grant of the President of the Russian Federation SP-1370.2015.5
   Перевод заглавия: Набор майорановских нулевых мод на треугольной решетке в фазе сосуществования сверхпроводимости и неколлинеарного магнитного порядка

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Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Zlotnikov, A. O.; Злотников, Антон Олегович; Fedoseev, A. D.; Федосеев, Александр Дмитриевич; Shustin, M. S.; Days of the Condensed Matter University of Bordeaux(15 ; 22-26 Aug. 2016 ; Bordeaux, France); Journées de la matiére condensée(15 ; 2016 ; Aug. ; 22-26 ; Bordeaux, France)
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    Gokhfeld, D. M.
    Analog of the intertype superconductivity in nanostructured materials / D. M. Gokhfeld, S. I. Popkov, A. A. Bykov // Physica C. - 2019. - Vol. 566. - Ст. 1353526, DOI 10.1016/j.physc.2019.1353526. - Cited References: 21. - The authors are grateful to D.A. Balaev, N.E. Savitskaya, N.A. Grigorieva for fruitful discussions and to A.A. Mistonov for provided samples. The work is supported by the Russian Science Foundation (project no. 17-72-10067 ). . - ISSN 0921-4534
   Перевод заглавия: Аналог межтиповой сверхпроводимости в наноструктуированных материалах
Кл.слова (ненормированные):
Tin-based inverse opal -- Intertype superconductivity -- Nanostructures
Аннотация: Magnetization hysteresis loops of tin samples with an inverted opal structure are presented. The sample formed by tin particles with the size of 70 and 128 nm is found to be a type-I superconductor. The tin sample formed by 80 and 42 nm particles demonstrates an analog of intertype superconductivity: features of both type-I and II superconductors are observed on the magnetization isothermal curves. A behavior of the irreversible and reversible magnetizations supports coexistence of type-I and II superconducting nanoparticles in this sample.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
NRC «Kurchatov Institute» - PNPI, Gatchina, 188300, Russian Federation

Доп.точки доступа:
Popkov, S. I.; Попков, Сергей Иванович; Bykov, A. A.; Гохфельд, Денис Михайлович
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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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Anisometric iron oxide-based nanoparticles and sols based on them: Preparation and properties / S. V. Stolyar [et al.] // J. Supercond. Novel Magn. - 2019. - Vol. 32, Is. 4. - P. 971–975, DOI 10.1007/s10948-018-4784-7. - Cited References: 18. - The reported study was carried out with the financial support of the Russian Foundation for Fundamental Research, the Government of the Krasnoyarsk Territory, and the Krasnoyarsk Territory Fund for Support of Scientific and Technical Activity in the framework of scientific Projects No. 18-43-243003, No. 17-42-240080 and No. 17-43-240527. The work is supported by the Special Program of the Ministry of Education and Science of the Russian Federation for the Siberian Federal University. . - ISSN 1557-1939
Кл.слова (ненормированные):
Nanoparticles and nanorods -- Chemical preparation -- Superparamagnetism
Аннотация: We have synthesized magnetic powders of the magnetite-maghemite series by the chemical reaction of the FeSO4 iron salt and the natural arabinogalactan polysaccharide. These particles with a high magnetization value (∼ 300 Gs) represent a mixture of spherical particles and nanorods. Particles of a spherical shape (diameter of ∼ 5–6 nm) show a superparamagnetic behavior at room temperature, while rods with a diameter of ∼ 5 nm and a length of 30 nm are magnetic. We have prepared sol samples based on the nanoparticle aqueous solution of arabinogalactan. Our results on the magnetism of the circular dichroism (MCD) on sol are consistent with the of Mössbauer spectroscopy data.

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Держатели документа:
Siberian Federal University, Krasnoyarsk, Russian Federation
Krasnoyarsk Scientific Center, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Stolyar, S. V.; Bayukov, O. A.; Баюков, Олег Артемьевич; Chekanova, L. A.; Чеканова, Лидия Александровна; Gerasimova, Y. V.; Герасимова, Юлия Валентиновна; Sokolov, A. Е.; Соколов, Алексей Эдуардович; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Yaroslavtsev, R. N.; Ярославцев, Роман Николаевич; Volochaev, M. N.; Волочаев, Михаил Николаевич; Artemyeva, A. S.; Cheremiskina, E. V.; Knyazev, Yu. V.; Князев, Юрий Владимирович
}
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Anisotropy and crystallite misalignment in textured superconductors / D. M. Gokhfeld, S. V. Semenov, M. I. Petrov [et al.] // J. Supercond. Nov. Magn. - 2023. - Vol. 36, Is. 1. - P. 59-65, DOI 10.1007/s10948-022-06454-8. - Cited References: 21. - This work was supported by the Russian Foundation for Basic Research and the Government of the Krasnoyarsk Territory, Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, project “Superconducting properties of YBCO incorporated by paramagnetic rare-earth elements” No. 20–42–240008 . - ISSN 1557-1939. - ISSN 1557-1947
Кл.слова (ненормированные):
Critical current -- Anizotropy -- BSCCO -- Texture -- Distribution function -- Magnetization -- Hysteresis loop
Аннотация: A misalignment of anisotropic crystallites causes small values of anisotropy and decreases the critical current density of textured polycrystalline superconductors. To relate the crystallite misalignment and out-plane anisotropy, the magnetic properties of the textured Bi2223 polycrystalline superconductor were investigated. A distribution of orientation angles of crystallites was determined using different data: scanning electron microscopy images and hysteresis magnetization loops when an external magnetic field was applied at different angles with respect to the texturing plane of the sample. It was demonstrated that the standard deviation of the distribution and the magnetic disorder angle of crystallites in textured samples can be determined from the magnetization data in perpendicular directions. These data may be either the irreversible magnetization measured for two different orientations of the sample or the simultaneously measured magnetization projections parallel and perpendicular to the magnetic field.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia
Siberian Federal University, Krasnoyarsk, 660041, Russia
Federal Research Center “Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences”, Krasnoyarsk, 660036, Russia

Доп.точки доступа:
Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Semenov, S. V.; Семенов, Сергей Васильевич; Petrov, M. I.; Петров, Михаил Иванович; Nemtsev, I. V.; Немцев, Иван Васильевич; Balaev, D. A.; Балаев, Дмитрий Александрович
}
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Zakharov, Yu. V.
Anisotropy of the magnetoresistance along and across domain-walls in a ferromagnet / Yu. V. Zakharov, Yu. I. Mankov, L. S. Titov // J. Phys. I. - 1991. - Vol. 1, Is. 5. - P. 759-764. - Cited References: 20 . - ISSN 1155-4304

РУБ Physics, Multidisciplinary
Рубрики:
SUPERCONDUCTIVITY
HOMO6S8
Аннотация: We discuss some peculiarities of the conduction electron motion in the vicinity of domain walls which lead to an anisotropy of the magnetoresistance. We also discuss the case of single crystals of ErRh4B4 and HoMo6S8 where magnetoresistance with the same qualitative features has been observed.

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Доп.точки доступа:
Mankov, Yu. I.; Маньков, Юрий Иннокентьевич; Titov, L. S.; Захаров, Юрий Владимирович
}
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Valkov, V. V.
Anomalies in the quantum excitation spectrum of a magnetic material with a strong quasi-particle interaction / V. V. Valkov, T. A. Valkova // JETP Letters. - 1990. - Vol. 52, Is. 11. - P. 589-592. - Cited References: 6 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
SUPERCONDUCTIVITY
Аннотация: It is shown in a nonlinear theory that the quantum spectrum of excitations becomes analogous to the spectrum of excitations of a quantum Bose liquid in the case of a highly anisotropic ferromagnet, with a large number of interacting quasiparticles.

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Доп.точки доступа:
Valkova, T. A.; Val'kov, V. V.
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Anomalous in-plane electronic scattering in charge ordered Na 0.41CoO 2•0.6H 2O / G. X. Cao [et al.] // Phys. Rev. Lett. - 2012. - Vol. 108, Is. 23. - Ст. 236401, DOI 10.1103/PhysRevLett.108.236401. - Cited References: 41. - We thank H. Habermeier, D. Mandrus, B. C. Sales, I. Eremin, I. I. Mazin, and P. J. Hirschfeld for useful discussions. G. Cao acknowledges support from NSFC (No. 10804068, 10774097). M. M. K. acknowledges support from RFBR (Grant No. 09-02-00127), Presisium of RAS program "Quantum physics of condensed matter" N5.7, Integration Grant of SBRAS-UrBRAS N40, and Russian FCP (GK 16.740.12.0731), and The Dynasty Foundation and ICFPM. Work at ORNL was supported by the Department of Energy, BES, Materials Science and Engineering Division. . - ISSN 0031-9007

РУБ Physics, Multidisciplinary
Рубрики:
SUPERCONDUCTIVITY
   TRIPLET
   FLUCTUATIONS
   IONS
Аннотация: We report electronic transport measurements on high quality floating zone grown NaxCoO2 and Na0.41CoO2·0.6H2O single crystals. We find an in-plane electronic scattering minimum near 11 K and a clear charge ordering at approximately 50 K. The electronic and magnetic properties in hydrated and nonhydrated Na0.41CoO2 samples are similar at higher temperature, but evolve in markedly different ways below ∼50 K, where a strong ferromagnetic tendency is observed in the hydrated sample. Model calculations show the relationship of this tendency to the structure of the Fermi surface. The results, particularly the clear differences between the hydrated and nonhydrated material show a substantially enhanced ferromagnetic tendency upon hydration. Implications for superconductivity are discussed.

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Держатели документа:
[Cao, Guixin
Gao, Yuze
Le Tacon, Mathieu
Lin, Chengtian] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany
[Cao, Guixin] Shanghai Univ, Dept Phys, Shanghai 200444, Peoples R China
[Cao, Guixin] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA
[Korshunov, Maxim M.] Univ Florida, Dept Phys, Gainesville, FL 32611 USA
[Korshunov, Maxim M.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Korshunov, Maxim M.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Singh, David J.] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA

Доп.точки доступа:
Cao, G. X.; Korshunov, M. M.; Коршунов, Максим Михайлович; Gao, Y. Z.; Le Tacon, M.; Singh, D. J.; Lin, C. T.
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10.

Val'kov, V. V.
Anomalous Properties and Coexistence of Antiferromagnetism and Superconductivity near a Quantum Critical Point in Rare-Earth Intermetallides / V. V. Val'kov, A. O. Zlotnikov // J. Experim. Theor. Phys. - 2013. - Vol. 116, Is. 5. - P. 817–822DOI 10.1134/S1063776113050129
Аннотация: Mechanisms of the appearance of anomalous properties experimentally observed at the transition through the quantum critical point in rare-earth intermetallides have been studied. Quantum phase transitions are induced by the external pressure and are manifested as the destruction of the long-range antiferromagnetic order at zero temperature. The suppression of the long-range order is accompanied by an increase in the area of the Fermi surface, and the effective electron mass is strongly renormalized near the quantum critical point. It has been shown that such a renormalization is due to the reconstruction of the quasiparticle band, which is responsible for the formation of heavy fermions. It has been established that these features hold when the coexistence phase of antiferromagnetism and superconductivity is implemented near the quantum critical point.

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Публикация на русском языке Аномальные свойства и сосуществование антиферромагнетизма со сверхпроводимостью вблизи квантовой критической точки в редкоземельных интерметаллидах. - [S. l. : s. n.]

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia;

Доп.точки доступа:
Zlotnikov, A. O.; Злотников, Антон Олегович; Вальков, Валерий Владимирович
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