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BATIYEV, E. G.
SUPERCONDUCTIVITY IN MULTI-VALLEY SEMICONDUCTORS / E. G. BATIYEV, V. A. BORISYOUK // Zhurnal Eksperimentalnoi Teor. Fiz. - 1986. - Vol. 90, Is. 2. - P. 558-568. - Cited References: 13 . - ISSN 0044-4510

РУБ Physics, Multidisciplinary

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Доп.точки доступа:
BORISYOUK, V. A.
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Peculiarities of the resistive state of the (Y,Lu)1Ba2Cu3O7-δ superconducting ceramics / K. S. Aleksandrov [et al.] // Physica C. - 1988. - Vol. 156, Is. 2. - P. 249-250 . - ISSN 0921-4534
Кл.слова (ненормированные):
Ceramic Materials -- Oxides -- Current Voltage Characteristics -- Yttrium Barium Copper Oxides -- Superconducting Materials
Аннотация: The resistive state of the high-Tc superconducting ceramics (Y, Lu)1Ba2Cu3O7-δ has been investigated, a hysteresis instability has been discovered in the current-voltage characteristics (CVC) under a current density j ≈ 1.7 kA cm-2. © 1988.

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Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Vasilyev, A. D.; Васильев, Александр Дмитриевич; Zwegintsev, S. A.; Звегинцев, Сергей Анатольевич; Петров, Михаил Иванович; Petrov, M. I.; Khrustalev, B. P.; Хрусталев, Борис Петрович
}
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PODMARKOV, A. N.
ON THE POSSIBILITY OF INDUCING SUPERCONDUCTIVITY BY A MAGNETIC-FIELD IN A METAL WITH KONDO IMPURITIES / A. N. PODMARKOV, I. S. SANDALOV // Zhurnal Eksperimentalnoi Teor. Fiz. - 1989. - Vol. 95, Is. 6. - P. 2235-2248. - Cited References: 17 . - ISSN 0044-4510

РУБ Physics, Multidisciplinary

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Доп.точки доступа:
SANDALOV, I. S.
}
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Ovchinnikov, S. G.
The band-structure of strong-correlated electrons in LA2-XSRXCUO4 and YBA2CU3O7-Y / S. G. Ovchinnikov, I. S. Sandalov // Physica C. - 1989. - Vol. 161, Is. 5-6. - P. 607-617, DOI 10.1016/0921-4534(89)90397-3. - Cited References: 20 . - ISSN 0921-4534

РУБ Physics, Applied

WOS
Доп.точки доступа:
Sandalov, I. S.; Сандалов, Игорь Семёнович; Овчинников, Сергей Геннадьевич
}
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Superconductivity near liquid nitrogen temperature in the Sn-Ba-Sr-Y-Cu-O system / K. S. Aleksandrov [et al.] // Physica C-Superconductivity and its Applications. - 1989. - Vol. 161, Is. 4. - P. 493-496, DOI 10.1016/0921-4534(89)90087-7 . - ISSN 0921-4534
Кл.слова (ненормированные):
Ceramic Materials -- Tin Compounds -- Bulk Superconductivity -- High Temperature Superconductors -- Oxide Superconductors -- Tin Barium Strontium Yttrium Copper Oxide -- Superconducting Materials
Аннотация: A high-Tc phase was found in the Sn-Ba-Sr-Y-Cu-O system. DC susceptibility data of Sn2Ba2Sr0.5Y0.5Cu3Ox show a single transition to bulk superconductivity with an onset temperature of 86 K. В© 1989.

Scopus

Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Khrustalev, B. P.; Хрусталев, Борис Петрович; Krivomazov, S. N.; Петров, Михаил Иванович; Petrov, M. I.; Vasilyev, A. D.; Zwegintsev, S. A.
}
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Ovchinnikov, S. G.
On nonhomogeneous states in a 2-dimensional hubbard-model / S. G. Ovchinnikov, I. S. Sandalov // Physica C. - 1990. - Vol. 166, Is. 1-2. - P. 197-199, DOI 10.1016/0921-4534(90)90573-W. - Cited References: 12 . - ISSN 0921-4534

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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Ovchinnikov, S. G.
Quasi-particle spectrum in copper oxides / S. G. Ovchinnikov, G. A. Petrakovsky // J. Supercond. - 1991. - Vol. 4, Is. 6. - P. 437-448, DOI 10.1007/BF00635862. - Cited References: 0 . - ISSN 0896-1107

РУБ Physics, Applied + Physics, Condensed Matter

Кл.слова (ненормированные):
ELECTRON CORRELATIONS -- ELECTRON ENERGY STRUCTURE -- COPPER OXIDE -- PHOTOEMISSION DATA -- copper oxide -- Electron correlations -- electron energy structure -- photoemission data -- Ceramic Materials -- Lanthanum Compounds -- Fermi Liquid -- Lanthanum Strontium Copper Oxides -- Oxide Superconductors -- Quasi Particles -- High Temperature Superconductors
Аннотация: The results of electronic structure calculations of the CuO2 layer, performed by the generalized tight-binding method, are presented. The strong electron correlations on both the Cu and O ions are included explicitly. The resulting quasiparticle band structure contains an insulator gap for undoped compounds like La2CuO4. The valence band consists of a large number of narrow Hubbard quasiparticle bands. The dispersion law of quasiparticles at the top of the valence band has a minimum at the GAMMA-point, indicating the existence of the multivalley Fermi surface in the doped La2-xSrxCuO4. The origin of the Fermi liquid behavior in the narrow quasiparticle bands is discussed.

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Scopus
Держатели документа:
L. V. Kirensky Institute of Physics, Siberian Department of the USSR Academy of Sciences, Krasnoyarsk, 660036, Russia

Доп.точки доступа:
Petrakovsky, G. A.; Петраковский, Герман Антонович; Овчинников, Сергей Геннадьевич
}
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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.

WOS

Доп.точки доступа:
Mankov, Yu. I.; Маньков, Юрий Иннокентьевич; Titov, L. S.; Захаров, Юрий Владимирович
}
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10.

OVCHINNIKOV, S. G.
EFFECT OF SUBSTITUTIONAL IMPURITY SPECIES ON THE SUPPRESSION OF MAGNETIC-PROPERTIES OF WEAKLY DOPED COPPER OXIDES / S. G. OVCHINNIKOV // Fiz. Tverd. Tela. - 1994. - Vol. 36, Is. 5. - P. 1307-1310. - Cited References: 16 . - ISSN 0367-3294

РУБ Physics, Condensed Matter
Рубрики:
ELECTRONIC-STRUCTURE
   SUPERCONDUCTIVITY
   LA2CUO4
   EXCITATIONS
   SPECTRA

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}
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11.

The effect of heat treatment on the transport properties of the polycrystalline HTSC / M. I. Petrov [et al.] // Physica C-Superconductivity and its Applications. - 1994. - Vol. 235-240, Is. 5. - P. 3043-3044, DOI 10.1016/0921-4534(94)91048-0. - Cited References: 6 . - ISSN 0921-4534

РУБ Physics, Applied

Аннотация: Temperature dependences of transport critical current (Jc) have been studied for polycrystalline HTSC samples of 1-2-3 structure with Y3/4Lu1/4Ba2Cu3O7 composition. The main aim of the investigation was the effect of the boundaries between crystallites on the current-carrying capability of the high-temperature superconductor. The modifications of the boundaries have been achieved by the long time heat treatments up to one week (?150 hours). It has been demonstrated experimentally that the Kulik-Omel'yanchuk theory describes adequately the temperature dependence of Jc of samples with short heat treatment time in "clean" limit. The absolute value of Jc (4.2k) ? 1.4kA/cm2. Long-term heat treated samples have Jc(4.2K) ? 0.1kA/cm2 and the temperature dependence of Jc becomes close to predictions of de Gennes theory. В© 1994.

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Доп.точки доступа:
Петров, Михаил Иванович; Petrov, M. I.; Balaev, D. A.; Балаев, Дмитрий Александрович; Khrustalev, B. P.; Хрусталев, Борис Петрович; Aleksandrov, K. S.; Александров, Кирилл Сергеевич
}
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12.

SANDALOV, I. S.
FLUX PHASE, NEEL ANTIFERROMAGNETISM, AND SUPERCONDUCTIVITY IN THE T-J MODEL / I. S. SANDALOV, M. . RICHTER // Phys. Rev. B. - 1994. - Vol. 50, Is. 17. - P. 12855-12865, DOI 10.1103/PhysRevB.50.12855. - Cited References: 27 . - ISSN 0163-1829

РУБ Physics, Condensed Matter
Рубрики:
HUBBARD-MODEL
INSTABILITY
ELECTRONS

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Scopus
Держатели документа:
RAS,KIRENSKY INST PHYS,KRASNOYARSK 660036,RUSSIA
ИФ СО РАН
Department of Physics, Uppsala University, Box 530, S-75121 Uppsala, Sweden
Kirensky Institute of Physics of RAS, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
RICHTER, M.; Сандалов, Игорь Семёнович
}
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13.

Ovchinnikov, S. G.
Density of hole-doped states in strongly correlated electron-systems of copper oxides / S. G. Ovchinnikov // Phys. Rev. B. - 1994. - Vol. 49, Is. 14. - P. 9891-9897, DOI 10.1103/PhysRevB.49.9891. - Cited References: 34 . - ISSN 0163-1829

РУБ Physics, Condensed Matter
Рубрики:
DYNAMIC PROPERTIES
   SUPERCONDUCTIVITY
   GAP
   LA2CUO4
   BI2SR2CACU2O8
   PHOTOEMISSION
   SPECTROSCOPY
   SPECTRA
   MODEL
   BAND
Аннотация: A generalized tight-binding method to calculate quasiparticle band structure and density of states in strongly correlated systems is presented. The band structures of undoped and weakly hole-doped CuO2 layer are calculated. The insulator gap has a charge transfer nature with a minor contribution from a Cu-O Coulomb interaction. Doping results in the appearance of an in-gap state with a simultaneous decrease of the density of states at the band edges in agreement with small cluster results and experimental data.

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Scopus
Держатели документа:
L. V. Kyrensky Institute of Physics, Siberian Branch of Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Овчинников, Сергей Геннадьевич
}
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14.

Avramov, P. V.
Effects of the intense electron correlations on the shape of x-ray CuK absorption spectra of La2-xSrxCuO4 / P. V. Avramov, S. G. Ovchinnikov // Zhurnal Eksperimentalnoi Teor. Fiz. - 1995. - Vol. 108, Is. 4. - P. 1479-1488. - Cited References: 28 . - ISSN 0044-4510

РУБ Physics, Multidisciplinary
Рубрики:
HIGH-TC SUPERCONDUCTIVITY
   EDGE STRUCTURE
   LA2CUO4
   SATELLITES
   ALPHA
   EXCITATIONS
   COPPER
   OXIDES
   STATE
   SHAKE

WOS

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Аврамов, Павел Вениаминович
}
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15.

OVCHINNIKOV, S. G.
THE INFLUENCE OF THE ANTIFERROMAGNETISM ON THE ELECTRONIC-STRUCTURE OF LA2CUO4 / S. . OVCHINNIKOV // J. Supercond. - 1995. - Vol. 8: University-of-Miami Workshop on High-Temperature Superconductivity - Physical Properties and Mechanisms (JAN 05-11, 1995, CORAL GABLES, FL), Is. 5. - P. 675-676, DOI 10.1007/BF00727473. - Cited References: 15 . - ISSN 0896-1107

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
OXIDES
MODEL
Кл.слова (ненормированные):
ELECTRON CORRELATIONS -- ELECTRON STRUCTURE -- SPIN FLUCTUATIONS -- Electron correlations -- electron structure -- spin fluctuations -- Antiferromagnetism -- Band structure -- Calculations -- Correlation theory -- Electrons -- Lanthanum compounds -- Paramagnetism -- Perturbation techniques -- Antiferromagnetic phase -- Electron correlations -- Intercluster interactions -- Spin fluctuations -- Electronic structure
Аннотация: The quasiparticle approach for electronic structure calculations considering strong electron correlations is given. The exact diagonalization of a multiband Hubbard Hamiltonian for a small cluster is combined with perturbation theory for intercluster hopping. The band structure of paramagnetic and antiferromagnetic La2CuO4 are discussed.

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Держатели документа:
L.V.Kirensky Institute of Physics, Krasnoyarsk, 660036, Russian Federation
}
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16.

Sandalov, I. S.
Local gauge invariance versus slave boson-like representations in systems with strongly correlated electrons / I. S. Sandalov, M. . Richter // Phys. Scr. - 1996. - Vol. 54, Is. 4. - P. 410-416, DOI 10.1088/0031-8949/54/4/020. - Cited References: 38 . - ISSN 0281-1847

РУБ Physics, Multidisciplinary
Рубрики:
T-J MODEL
   VALENCE-BOND STATE
   DIAGRAM TECHNIQUE
   ANDERSON MODEL
   HUBBARD MODEL
   SUPERCONDUCTIVITY
   LIMIT
   PHASE
Аннотация: The flux phase solutions in the t-J model the gauge theories with Chern-Simons term, promising new exciting physics, are so far obtained only within slave-boson (or fermion) approaches, where local gauge invariance is not taken into account exactly. We inspect the possibility to do this, mainly, in the example of the t-J model The analysis of different parametrizations in the functional representation shows that (i) calculations which take into account constraints for the number of on-site-available states are describing quasiparticles in terms of the wrong local statistics, and contain gauge non-invariant objects; (ii) application of the projection technique in the slave-boson(fermion) representation reproduces the correct statistics, and is exactly equivalent to the conventional diagram technique for Hubbard operators. In the language of slave bosons this means that the Fourier transformation leading to Bloch states should be made only after accounting constraints in the measure of functional integral.

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Scopus
Держатели документа:
UNIV UPPSALA,DEPT PHYS,CONDENSED MATTER THEORY GRP,S-75121 UPPSALA,SWEDEN
RUSSIAN ACAD SCI,LV KIRENSKY PHYS INST,KRASNOYARSK 660036,RUSSIA
DRESDEN UNIV TECHNOL,DEPT PHYS,MPG RES GRP ELECTRON SYST,D-01062 DRESDEN,GERMANY
ИФ СО РАН

Доп.точки доступа:
Richter, M.; Сандалов, Игорь Семёнович
}
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17.

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

WOS

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Аврамов, Павел Вениаминович
}
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18.

Thermally activated phase slippage in composites HTSC + CuO / M. I. Petrov [et al.] // Physica C-Superconductivity and its Applications. - 1997. - Vol. 282, Is. PART 4. - P. 2453-2454 . - ISSN 0921-4534
Кл.слова (ненормированные):
Copper oxides -- Critical currents -- Thermal effects -- Thermally activated phase slippage (TAPS) -- High temperature superconductors
Аннотация: The effect of thermally activated phase slippage (TAPS) in composites HTSC + CuO has been studied. The experimental ?(T) dependences have been treated within framework of TAPS using temperature dependences of critical current for tunnel S-I-S junctions.

Scopus

Доп.точки доступа:
Петров, Михаил Иванович; Petrov, M. I.; Balaev, D. A.; Балаев, Дмитрий Александрович; Шайхутдинов, Кирилл Александрович; Shaikhutdinov, K. A.; Khrustalev, B. P.; Хрусталев, Борис Петрович; Aleksandrov, K. S.; Александров, Кирилл Сергеевич
}
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19.

Transport properties of composites high temperature superconductor + semiconductor with different carrier concentration / M. I. Petrov [et al.] // Physica C-Superconductivity and its Applications. - 1997. - Vol. 282, Is. PART 4. - P. 2449-2450 . - ISSN 0921-4534
Кл.слова (ненормированные):
Carrier concentration -- Critical current density (superconductivity) -- High temperature superconductors -- Semiconductor materials -- Thermal effects -- Transport properties -- Superconductor semiconductor superconductor junctions -- Composite materials
Аннотация: Composites HTSC + semiconductor with different carrier concentrations were prepared as a model of Josephson type contacts. Experimental temperature dependences of the critical current density Jc(T) in the composites are presented. The best congruence of experiment with theory was reached for the Schussler-Kummel consideration of Andreev scattering in S-Sm-S (S-superconductor, Sm-semiconductor) junctions.

Scopus

Доп.точки доступа:
Petrov, M. I.; Петров, Михаил Иванович; Balaev, D. A.; Балаев, Дмитрий Александрович; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Khrustalev, B. P.; Хрусталев, Борис Петрович; Aleksandrov, K. S.; Александров, Кирилл Сергеевич
}
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20.

Avramov, P. V.
Underestimating the width of the bandgap in the electronic spectra of La2CuO4 / P. V. Avramov, S. G. Ovchinnikov // Phys. Solid State. - 1997. - Vol. 39, Is. 3. - P. 389-391, DOI 10.1134/1.1129865. - Cited References: 9 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
SUPERCONDUCTIVITY
Аннотация: It is shown that the width of the bandgap determined by the simultaneous analysis of the experimental photoelectron and inverse photoemission spectra of the surface of La2CuO4 using a common energy scale is underestimated by 1 eV. The electronic and satellite structures of the spectra of La2CuO4 are calculated on the basis of the multiband p-d model and the sudden perturbation approximation. It is shown that shakedown processes shift the one-electron contour of the final two-hole configuration of the photoelectron spectrum 1 eV down the energy scale and shift the contour of the final d(10) configuration of the inverse photoemission spectrum downward by 2 eV; these shifts cause the energy splitting between the filled and empty bands to be underestimated. (C) 1997 American Institute of Physics.

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Scopus
Держатели документа:
L. V. Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
ИФ СО РАН

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Аврамов, Павел Вениаминович
}
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