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VALKOV, V. V.
MAGNETIZATION OF GRANULATED HTSC IN INTENSE MAGNETIC-FIELDS / V. V. VALKOV, B. P. KHRUSTALEV // Zhurnal Eksperimentalnoi Teor. Fiz. - 1995. - Vol. 107, Is. 4. - P. 1221-1231. - Cited References: 18 . - ISSN 0044-4510

РУБ Physics, Multidisciplinary
Рубрики:
CRITICAL-STATE MODEL
HIGH-TEMPERATURE SUPERCONDUCTORS
HIGH-TC SUPERCONDUCTORS

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Доп.точки доступа:
KHRUSTALEV, B. P.
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Avramov, P. V.
The strong electron correlation effects in XAFS spectra of HTSC cuprates / P. V. Avramov, S. G. Ovchinnikov // J. Phys. IV. - 1997. - Vol. 7: 9th International Conference on X-Ray Absorption Fine Structure (AUG 26-30, 1996, GRENOBLE, FRANCE), Is. C2. - P. 183-185. - Cited References: 11 . - ISSN 1155-4339

РУБ Physics, Multidisciplinary
Рубрики:
X-RAY-ABSORPTION
   MULTIPLE-SCATTERING ANALYSIS
   EDGE STRUCTURE
   LA2CUO4
   XANES
Аннотация: Theoretical XAFS spectra of highly correlated copper oxides have been presented as a product of a single-electron part obtained by the SCF X alpha- SW method, and a multi-electron part obtained by the multi-band multi-electron p-d model. The main line of CuK-spectrum of La2CuO4 was aligned to the Cud(10) (L) under bar configuration and the single satellite line was aligned to the Cud(9). Comparison of the theoretical data with the experimental ones shows that the ground state of the two-holes in the CuO4 doped cell is triplet. The last conclusion has been confirmed by analysis of CuL2,3-spectra of two-hole impurity states of doped CuO4 cell. Another interesting future of CuL2,3-spectra a peak 2.8 eV higher the threshold was aligned to the transitions into quasi-stationary states due to existence of a high barrier in the Cud-state potential.

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Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Аврамов, Павел Вениаминович
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Makarov, I. A.
Reconstruction of the Fermi surface of HTSC cuprates in a high magnetic field / I. A. Makarov, S. G. Ovchinnikov, E. I. Shneider // JETP Letters. - 2009. - Vol. 89, Is. 12. - P. 632-637, DOI 10.1134/S002136400912008X. - Cited References: 19. - This work was supported by the Russian Foundation for Basic Research (project no. 09-02-00127), the Siberian Branch and the Ural Division, Russian Academy of Sciences (integration project no. 40), and the Presidium of the Russian Academy of Sciences (program no. 5.7). . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
T-J MODEL
   COPPER OXIDES
   ELECTRON
   SPECTRUM
   BAND
Аннотация: The effect of a high magnetic field on the electronic structure of HTSC cuprates is considered. The study is performed in the t-t'-taEuro(3)-J* model, and the high magnetic field effect is taken into account not only as the Zeeman splitting of the one-electron levels, but also in the occupation numbers of the states with different spin projections and in the formation of the spin correlation functions. The field is assumed to be high enough to align all of the spins along the field. As a result, the Fermi surface reconstruction is obtained from four hole pockets about the nodal point (pi/2, pi/2) in the paramagnetic phase to a large hole pocket about the point (pi, pi) in the ferromagnetic phase. As the magnetic field strength decreases, a number of quantum phase transitions are revealed; they are manifested in the changed Fermi surface topology. The Fermi surface reconstruction with a decreasing field is qualitatively the same as that with an increasing doping degree in the absence of a magnetic field.

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Держатели документа:
[Makarov, I. A.
Ovchinnikov, S. G.
Shneider, E. I.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Shneider, E. I.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Shneider, E. I.; Шнейдер, Елена Игоревна; Макаров, Илья Анатольевич; Russian Foundation for Basic Research [09-02-00127]; Siberian Branch and the Ural Division, Russian Academy of Sciences [40]; Presidium of the Russian Academy of Sciences [5.7]
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Avramov, P. V.
Non-diagram transitions in polarized X-ray absorption CuL(3) spectra of HTSC-ceramics / P. V. Avramov, S. G. Ovchinnikov // Fiz. Tverd. Tela. - 1996. - Vol. 38, Is. 11. - P. 3226-3240. - Cited References: 28 . - ISSN 0367-3294

РУБ Physics, Condensed Matter
Рубрики:
HIGH-TC SUPERCONDUCTIVITY
   LA2CUO4
   ALPHA
   SATELLITES
   STATES
   OXIDES
   XANES

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Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Аврамов, Павел Вениаминович
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Quantum interference in HTSC-ceramics of system Tl-Ca-Ba-Cu-O / D. A. Velikanov [и др.] // Izvestiya vysshikh uchebnykh zavedenii Fizika. - 1990. - Vol. 33, Is. 9. - P. 26-29 ; Russian Physics Journal ; Известия высших учебных заведений. Физика. - Cited References: 13 . - ISSN 0021-3411

РУБ Physics, Multidisciplinary
Рубрики:
RF SQUID
   DC-SQUID
   TEMPERATURE
   SUPERCONDUCTOR
   OPERATION

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Доп.точки доступа:
Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Patrin, G. S.; Патрин, Геннадий Семёнович; Petrakovskii, G. A.; Петраковский, Герман Антонович; Volkov, V. Y.

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Polskii, A. I.
Determination of volume of superconducting phase of htsc materials by uh method / A. I. Polskii, V. M. Popel // Pisma Zhurnal Tek. Fiz. - 1991. - Vol. 17, Is. 3. - P. 37-40. - Cited References: 2 . - ISSN 0320-0116

РУБ Physics, Applied

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Доп.точки доступа:
Popel, V. M.
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Patrin, G. S.
Detection of magneto-dependent higher harmonics in htsc ceramics via the change of the low field microwave response under the passing of an alternating-current / G. S. Patrin, G. A. PETRAKOVSKII, I. E. KHARITONOV // Phys. Lett. A. - 1991. - Vol. 158, Is. 3-4. - P. 167-170, DOI 10.1016/0375-9601(91)90921-T. - Cited References: 15 . - ISSN 0375-9601

РУБ Physics, Multidisciplinary
Рубрики:
BA-CU-O
GENERATION
STATE
Аннотация: The results of an investigation on the generation of higher harmonics under the passing of a low frequency current in HTSC ceramics by microwave spectroscopy methods are presented. It is found that the generation of only even harmonics occurs. The dependence of the signal upon the harmonic number and. as an example for the second harmonic, the temperature dependences of the microwave response parameters are discussed.

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Доп.точки доступа:
PETRAKOVSKII, G. A.; Петраковский, Герман Антонович; KHARITONOV, I. E.; Патрин, Геннадий Семёнович
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The effect of ferrimagnetic ordering in insulating component of composites HTSC plus Yttrium Iron Garnet on its transport properties / D. A. Balaev [et al.] // Solid State Commun. - 2003. - Vol. 125, Is. 5. - P. 281-285, DOI 10.1016/S0038-1098(02)00602-6. - Cited References: 34 . - ISSN 0038-1098

РУБ Physics, Condensed Matter
Рубрики:
SUPERCONDUCTOR
TRANSITION
CURRENTS
Кл.слова (ненормированные):
high-Tc superconductors -- heterojunctions -- magnetically ordered materials -- grain boundaries -- Heterojunctions -- High-Tc superconductors -- Magnetically ordered materials -- Grain boundaries -- Grain boundaries -- Heterojunctions -- High temperature superconductors -- Transport properties -- Yttrium compounds -- Ferrimagnetic ordering -- Garnets
Аннотация: Composites Y3/4Lu1/4Ba2Cu3O7 + Y3Fe5O12 modeling random network superconductor-ferrimagnetic-superconductor have been prepared and their transport properties (temperature dependences of resistivity rho and critical current density j(c), current-voltage characteristics) have been studied. Below the superconducting transition temperature T-m the rho(T) dependences exhibit a kink at some temperature T-m. The crossover of current-voltage characteristics from ohmic-like behavior in range T-m/T-c to non-linear one below T-m is observed. Transport properties of the 'benchmark' composites Y3/4Lu1/4Ba2Cu3O7 + Y3Al5O12 are typical for network superconductor-insulator-superconductor Josephson junction. The behavior observed for Y3/4Lu1/4Ba2Cu3O7 + Y3Fe5O12 composites is attributed to peculiarities of supercurrent carriers tunnelling through ferrimagnetic barriers. (C) 2002 Elsevier Science Ltd. All rights reserved.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Krasnoyarsk 660036, Russian Federation
Krasnoyarsk State University, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Shaihutdinov, K. A.; Popkov, S. I.; Попков, Сергей Иванович; Petrov, M. I.; Петров, Михаил Иванович
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Transport properties of HTSC-based composites: Modeling the random networks of Josephson weak links with magneto-active barriers. / K. A. Shaihutdinov [et al.] // J. Low Temp. Phys. - 2003. - Vol. 130, Is. 3-4. - P. 347-381, DOI 10.1023/A:1022204705059. - Cited References: 89 . - ISSN 0022-2291

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
CURRENT-VOLTAGE CHARACTERISTICS
   HIGH-TEMPERATURE SUPERCONDUCTORS
   SNS JUNCTIONS
   THERMAL FLUCTUATIONS
   RESISTIVE PROPERTIES
   PERCOLATION SYSTEM
   TRANSITION
   YBA2CU3O7
   BOUNDARY
   OXIDES
Кл.слова (ненормированные):
Crystalline materials -- Electric insulators -- Josephson junction devices -- Magnetic devices -- Magnetic barriers -- Superconducting materials -- composite
Аннотация: The results of the study of transport properties (temperature dependences of resistivity and critical current, current-voltage characteristics) of two-phase composites on the basis of Y3/4Lu1/4Ba2Cu3O7 high-temperature superconductor (HTSC) produced by fast baking technique and modelling networks of Josephson-type weak links are reported. Non-superconducting ingredients with different magnetic structures, insulators and normal metals, function as barriers between HTSC crystallites. Besides strong suppression of superconducting properties in HTSC composites with magnetic barriers, anomalous behavior of temperature dependences of resistivity below T-c of HTSC grains have been observed and investigated.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Krasnoyarsk 660036, Russian Federation
Reshetnev Siberian St. Aerosp. Univ., Krasnoyarsk 660014, Russian Federation
Krasnoyarsk State University, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Shaihutdinov, K. A.; Balaev, D. A.; Балаев, Дмитрий Александрович; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Popkov, S. I.; Попков, Сергей Иванович; Petrov, M. I.; Петров, Михаил Иванович; NATO Advanced Research Workshop on Vortex Dynamics in High-Temperature Superconductors(2002 ; May ; 17-22)
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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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