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Lifshitz quantum phase transitions and Fermi surface transformation with hole doping in high-Tc superconductors / S. G. Ovchinnikov, M. M. Korshunov, E. Shneyder // arXiv. - 2009. - Ст. arXiv:0909.2308

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Держатели документа:
Max-Planck-Institut f¨ur Physik komplexer Systeme, D-01187 Dresden, Germany
Department of Physics, University of Florida, Gainesville, Florida 32611, USA
L.V. Kirensky Institute of Physics, Siberian Branch of Russian Academy of Sciences, 660036 Krasnoyarsk, Russia
Siberian Federal University, Krasnoyarsk, 660041, Russia
Reshetnev Siberian State Aerospace University, Krasnoyarsk 660014, Russia

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Korshunov, M. M.; Коршунов, Максим Михайлович; Shneyder, E. I.; Шнейдер, Елена Игоревна
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    Tuning the peak effect in the Y1−xNdxBa2Cu3O7−δ compound / D. M. Gokhfeld [et al.] // Ceram. Int. - 2017. - Vol. 43, Is. 13. - P. 9985-9991, DOI 10.1016/j.ceramint.2017.05.011. - Cited References: 37. - This work was supported by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project no. 16-48-243018 and the Russian Foundation for Basic Research, project no. 16-38-00400. . - ISSN 0272-8842
   Перевод заглавия: Управление пик-эффектом в соединении Y1−xNdxBa2Cu3O7−δ
Кл.слова (ненормированные):
Peak effect -- Bulk superconductors -- Critical current -- Pinning -- Characterization -- YBCO
Аннотация: Polycrystalline Y1−xNdxBa2Cu3O7−δ (x=0.02, 0.11, and 0.25) superconductors are synthesized. Nd atoms are uniformly distributed over grains. The magnetization loops of the samples have a pronounced second peak in a wide temperature range. The magnetization data are analyzed using the extended critical state model. It is found that the order-disorder transition of the vortex lattice is affected by doping with neodymium and temperature; the second-peak field and width decrease monotonically with increasing x value. The undoped polycrystalline YBa2Cu3O7−δ compound is assumed to exhibit the peak effect in higher magnetic fields.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Balaev, D. A.; Балаев, Дмитрий Александрович; Yakimov, I. S.; Petrov, M. I.; Петров, Михаил Иванович; Semenov, S. V.; Семёнов, Сергей Васильевич
}
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Valkov, V. V.
Generalized Kondo lattice model and its spin-polaron realization by the projection method for cuprates / V. V. Valkov, D. M. Dzebisashvili, A. F. Barabanov // Theor. Math. Phys. - 2017. - Vol. 191, Is. 2. - P. 752-763, DOI 10.1134/S0040577917050142. - Cited References:35. - This research was supported by the Russian Foundation for Basic Research (Grant No. 16-02-00073, 16-02-00304, and 16-42-240435) and the Siberian Branch of the Russian Academy of Sciences (Complex Program No. II.2P, Grant No. 0358-2015-0005). . - ISSN 0040-5779. - ISSN 1573-9333

РУБ Physics, Multidisciplinary + Physics, Mathematical
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTIVITY
HIGH-TC SUPERCONDUCTORS
COPPER OXIDES
Кл.слова (ненормированные):
strong electron correlation -- spin-fermion model -- Kondo lattice model -- spin polaron
Аннотация: The spin-fermion model, which is an effective low-energy realization of the three-band Emery model after passing to the Wannier representation for the px and py orbitals of the subsystem of oxygen ions, reduces to the generalized Kondo lattice model. A specific feature of this model is the existence of spin-correlated hoppings of the current carriers between distant cells. Numerical calculations of the spectrum of spin-electron excitations highlight the important role of the long-range spin-correlated hoppings.

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Публикация на русском языке

Держатели документа:
RAS, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk, Russia.
Reshetnyov Siberian State Aerosp Univ, Krasnoyarsk, Russia.
RAS, Inst High Pressure Phys, Troitsk, Moscow Oblast, Russia.

Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Barabanov, A. F.; Вальков, Валерий Владимирович; Russian Foundation for Basic Research [16-02-00073, 16-02-00304, 16-42-240435]; Siberian Branch of the Russian Academy of Sciences (Complex Program) [II.2P, 0358-2015-0005]
}
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Korshunov, M. M.
Impurities in multiband superconductors / M. M. Korshunov, Y. N. Togushova, O. V. Dolgov // Physics-Uspekhi. - 2016. - Vol. 59, Is. 12. - P. 1211-1240, DOI 10.3367/UFNe.2016.07.037863. - Cited References: 200. - We acknowledge partial support by RFBR (grant 16-02-00098) and Government Support of the Leading Scientific Schools of the Russian Federation (NSh-7559.2016.2). . - ISSN 1063-7869
Кл.слова (ненормированные):
Unconventional superconductors -- Iron pnictides -- Iron chalcogenides -- Impurity scattering
Аннотация: Disorder impurities and defects violating the ideal long-range order is always present in solids. It can result in interesting and sometimes unexpected effects in multiband superconductors, especially if the superconductivity is uncon-ventional, thus having symmetry other than the usual s-wave. This paper uses the examples of iron-based pnictides and chal-cogenides to examine how both nonmagnetic and magnetic impurities affect superconducting states with s± and s++ order parameters. We show that disorder causes the transition between s± and s++ states and examine what observable effects this transition can produce. © 2016 Uspekhi Fizicheskikh Nauk, Russian Academy of Sciences.

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Публикация на русском языке Коршунов, Максим Михайлович. Примеси в многозонных сверхпроводниках [Текст] / М. М. Коршунов, Ю. Н. Тогушова, В. Г. Долгов // Успехи физ. наук : ред. журн. "Успехи физ. наук", 2016. - Т. 186 № 12. - С. 1315-1347

Держатели документа:
Kirensky Institute of Physics, Federal Research Center, Krasnoyarsk Science Center SB RAS, ul. Akademgorodok 50, str. 38, Krasnoyarsk, Russian Federation
Siberian Federal University, Svobodnyi prosp. 79, Krasnoyarsk, Russian Federation
Max-Planck-Institut fur Festkorperforschung, Stuttgart, Germany
Lebedev Physical Institute, Russian Academy of Sciences, Leninskii prosp. 53, Moscow, Russian Federation

Доп.точки доступа:
Togushova, Yu.N.; Тогушова, Ю. Н.; Dolgov, O. V.; Коршунов, Максим Михайлович
}
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    Establishing of peak effect in YBCO by Nd substitution / D. M. Gokhfeld [et al.] // J. Magn. Magn. Mater. - 2017. - Vol. 440. - P. 127-128, DOI 10.1016/j.jmmm.2016.12.089. - Cited References:10. - The work was supported by Russian Foundation for Basic Research Grant No. 16-38-00400. . - ISSN 0304-8853. - ISSN 1873-4766
   Перевод заглавия: Возникновение пик-эффекта в YBCO при добавлении Nd

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
SUPERCONDUCTORS
Кл.слова (ненормированные):
Peak effect -- Magnetization -- Bulk superconductors -- Critical current -- YBCO -- Nd3+
Аннотация: Y0.75Nd0.25Ba2Cu3O7−d superconductor has the peak effect with pronounced fishtail feature on magnetization hysteresis. The magnetic field of the peak effect maximum is in ~4 times higher than one of NdBa2Cu3O7−d. The magnetization hysteresis is tilted anticlockwise due to paramagnetic Nd3+ ions occurred on the surface of grains and in the vortex cores.

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Доп.точки доступа:
Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Semenov, S. V.; Семёнов, Сергей Васильевич; Balaev, D. A.; Балаев, Дмитрий Александрович; Yakimov, I. S.; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Terentyev, K. Yu.; Терентьев, Константин Юрьевич; Freydman, A. L.; Фрейдман, Александр Леонидович; Krasikov, A. A.; Красиков, Александр Александрович; Petrov, M. I.; Петров, Михаил Иванович; Russian Foundation for Basic Research [16-38-00400]; 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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    Korshunov, M. M.
    Comparison of experimental data on the spin resonance frequency and gap magnitudes in Fe-based superconductors / M. M. Korshunov, V. A. Shestakov, Y. N. Togushova // J. Magn. Magn. Mater. - 2017. - Vol. 440: EURO-Asian Symposium on Trends in Magnetism (EASTMAG) (AUG 15-19, 2016, Siberian Fed Univ, Krasnoyarsk, RUSSIA). - P. 133-135, DOI 10.1016/j.jmmm.2016.12.082. - Cited References:73. - We would like to thank H. Kontani, S.A. Kuzmichev, T.E. Kuzmicheva, and V.M. Pudalov for useful discussions. We acknowledge partial support by RFBR (Grant 16-02-00098), and Government Support of the Leading Scientific Schools of the Russian Federation (NSh-7559.2016.2). . - ISSN 0304-8853. - ISSN 1873-4766
   Перевод заглавия: Сравнение экспериментальных данных по частоте спинового резонанса и величины щели в сверхпроводниках на основе железа

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
RESOLVED PHOTOEMISSION-SPECTROSCOPY
INELASTIC NEUTRON-SCATTERING
Кл.слова (ненормированные):
Fe-based superconductors -- Inelastic neutron scattering -- Unconventional -- superconductivity -- Magnetic mechanism of pairing
Аннотация: Here we review experimental data on the peak in inelastic neutron scattering (INS) and superconducting gaps extracted from various experimental techniques. Comparison of energy scales gives the confidence that the observed peak in INS for most materials is the true spin resonance.

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Доп.точки доступа:
Shestakov, V. A.; Togushova, Yu. N.; Коршунов, Максим Михайлович; RFBR [16-02-00098]; Government Support of the Leading Scientific Schools of the Russian Federation [NSh-7559.2016.2]; 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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Anisotropy of the magnetoresistive properties of granular high-temperature superconductors resulting from magnetic flux compression in the intergrain medium / S. V. Semenov [et al.] // Phys. Solid State. - 2017. - Vol. 59, Is. 7. - P. 1291-1297, DOI 10.1134/S1063783417070241. - Cited References: 26 . - ISSN 1063-7834
Аннотация: To elucidate the origin of the well-known anisotropy of the magnetoresistive properties of granular high-temperature superconductors (HTSs), which is related to the mutual orientation of magnetic field H and transport current j, we investigate the hysteretic dependences of magnetoresistance R(H) of the yttrium HTS sample at the perpendicular (H ⊥ j) and parallel (H || j) configurations. The hysteretic R(H) dependences are analyzed using the concept of the effective field in the intergrain boundaries through which superconducting current carriers tunnel. The effective degree of magnetic flux compression in the intergrain medium at the perpendicular configuration was found to be twice as much as at the parallel one. This approach explains well the anisotropy of the magnetoresistive properties of granular HTSs, which was previously reported by many authors, and the temperature dependences of the resistance in the resistive transition region.

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Публикация на русском языке Анизотропия магниторезистивных свойств гранулярных высокотемпературных сверхпроводников как результат сжатия магнитного потока в межгранульной среде [Текст] / С. В. Семенов [и др.] // Физ. тверд. тела : Наука, 2017. - Т. 59 Вып. 7. - С. 1267–1273

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

Доп.точки доступа:
Semenov, S. V.; Семенов, Сергей Васильевич; Balaev, D. A.; Балаев, Дмитрий Александрович; Pochekutov, M. A.; Почекутов, М. А.; Velikanov, D. A.; Великанов, Дмитрий Анатольевич
}
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    Pinning force scaling of electrospun Bi-2212 nanowire networks / M. R. Koblischka [et al.] // Solid State Commun. - 2017. - Vol. 264. - P. 16-18, DOI 10.1016/j.ssc.2017.07.002. - Cited References: 24. - This work is supported by the DFG project Ko2323/8, which is gratefully acknowledged . - ISSN 0038-1098
   Перевод заглавия: Скейлинг силы пиннинга сетей нанопроволок Bi-2212, полученных электропрядением
Кл.слова (ненормированные):
Electrospinning -- Bi-2212 superconductors -- Flux pinning -- Pinning force scaling
Аннотация: Flux pinning forces were determined on different network samples of superconducting Bi2Sr2CaCu2O8 (Bi-2212) nanowires prepared by the electrospinning technique. We employed magnetization data determined by SQUID magnetometry in a wide temperature range 10 K
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Держатели документа:
Institute of Experimental Physics, Saarland University, Campus C 6 3, Saarbrucken, Germany
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50/38, Krasnoyarsk, Russian Federation
Institut Jean Lamour, UMR CNRS-Universite de Lorraine, Vand?vre-les-Nancy, France

Доп.точки доступа:
Koblischka, M. R.; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Chang, C.; Hauet, T.; Hartmann, U.
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    Togushova, Yu. N..
    Impurity-induced smearing of the spin resonance peak in Fe-based superconductors / Y. N. Togushova, V. A. Shestakov, M. M. Korshunov // J. Low Temp. Phys. - 2016. - Vol. 185, Is. 5-6. - P. 481-487, DOI 10.1007/s10909-016-1577-x. - Cited References:25. - We acknowledge partial support by the RFBR (Grant 13-02-01395), President Grant for Government Support of the Leading Scientific Schools of the Russian Federation (NSh-2886.2014.2), and The Ministry of education and science of Russia (GF-2, SFU). . - ISSN 0022-2291. - ISSN 1573-7357
   Перевод заглавия: Размытие спинового резонанса примесями в сверхпроводниках на основе железа

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTIVITY
ELECTRONIC-STRUCTURE
IRON
Кл.слова (ненормированные):
Fe-based superconductors -- Spin resonance peak -- Spin-orbit coupling -- Impurity scattering
Аннотация: The spin resonance peak in the iron-based superconductors is observed in inelastic neutron scattering experiments and agrees well with predicted results for the extended s-wave (s±) gap symmetry. On the basis of four-band and three-orbital tight-binding models we study the effect of nonmagnetic disorder on the resonance peak. Spin susceptibility is calculated in the random-phase approximation with the renormalization of the quasiparticle self-energy due to the impurity scattering in the static Born approximation. We find that the spin resonance becomes broader with the increase of disorder and its energy shifts to higher frequencies. For the same amount of disorder the spin response in the s± state is still distinct from that of the s++ state.

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Держатели документа:
Siberian Fed Univ, Svobodny Prospect 79, Krasnoyarsk 660041, Russia.
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Shestakov, V. A.; Korshunov, M. M.; Коршунов, Максим Михайлович; RFBR [13-02-01395]; President Grant for Government Support of the Leading Scientific Schools of the Russian Federation [NSh-2886.2014.2]; Ministry of education and science of Russia [GF-2, SFU]
}
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10.

Kuz'min, V. I.
Effect of canted antiferromagnetic order on the electronic structure in the t–J* model within the cluster perturbation theory / V. I. Kuz’min, S. V. Nikolaev, S. G. Ovchinnikov // J. Exp. Theor. Phys. - 2016. - Vol. 123, Is. 3. - P. 511-519, DOI 10.1134/S1063776116090065. - Cited References: 50. - We are grateful to V.V. Val’kov for stimulating discussions. This work was supported by the Russian Science Foundation (project no. 14-12-00061) . - ISSN 1063-7761
Кл.слова (ненормированные):
Antiferromagnetism -- Electronic structure -- High temperature superconductors -- Magnetic fields -- Antiferromagnetic orderings -- Cluster perturbation theories -- Electron-doping -- External fields -- External magnetic field -- Non-monotonic dependence -- Short-range correlations -- Spectral weight -- Perturbation techniques
Аннотация: The electronic structure in the two-dimensional t–J* model with canted antiferromagnetic order in an external magnetic field has been calculated within the cluster perturbation theory. In zero external field, the evolution of the Fermi surface with n-type doping has been obtained in good agreement with experimental data on cuprate superconductors. It has been shown that the inclusion of short-range correlations can result in a nonmonotonic dependence of the spectral weight distribution at the Fermi level on the external magnetic field. In contrast to the case of electron doping, such changes in the case of hole doping can be expected at experimentally achievable fields. © 2016, Pleiades Publishing, Inc.

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Публикация на русском языке Кузьмин, Валерий Ипполитович. Влияние скошенного антиферромагнитного порядка на электронную структуру в t-J*-модели в рамках кластерной теории возмущений [Текст] / В. И. Кузьмин, С. В. Николаев, С. Г. Овчинников // Журн. эксперим. и теор. физ. : Наука, 2016. - Т. 150 Вып. 3. - С. 592-601

Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Nikolaev, S. V.; Николаев, Сергей Викторович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Кузьмин, Валерий Ипполитович
}
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