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Mitskan, V. A.
Implementation of the concept of spin polaron in cuprate superconductors within the diagram technique / V. A. Mitskan, M. M. Korovushkin, D. M. Dzebisashvili // JETP Letters. - 2021. - Vol. 114, Is. 5. - P. 289-295, DOI 10.1134/S0021364021170094. - Cited References: 43. - This work was supported by the Russian Foundation for Basic Research, project nos. 18-02-00837 and 20-32-70059 . - ISSN 0021-3640. - ISSN 1090-6487

РУБ Physics, Multidisciplinary
Рубрики:
ELECTRONIC-STRUCTURE
ELEMENTARY EXCITATIONS
QUASI-PARTICLES
Аннотация: The spectral properties of an ensemble of spin-polaron quasiparticles have been studied within the spin–fermion model of cuprate superconductors using the method combining the Feynman diagram technique and the diagram technique for spin operators. It has been shown that strong spin–charge coupling results in the formation of the lower spin-polaron band separated by a wide energy gap from the band of bare holes. It has been shown that the spin-polaron band has a local minimum near the (π/2, π/2) point of the Brillouin zone. A class of diagrams for the self-energy part that have a fundamental significance for the description of the main features of the spin-polaron spectrum has been determined.

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Публикация на русском языке Мицкан, Виталий Александрович. Реализация концепции спинового полярона в купратных сверхпроводниках на основе диаграммной техники [Текст] / В. А. Мицкан, М. М. Коровушкин, Д. М. Дзебисашвили // Письма в ЖЭТФ. - 2021. - Т. 114 Вып. 5. - С. 339-345

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Fed Res Ctr KSC, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Korovushkin, M. M.; Коровушкин, Максим Михайлович; Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Мицкан, Виталий Александрович
}
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    Komarov, K. K.
    Effect of Coulomb repulsion on the London penetration depth in cuprate superconductors / K. K. Komarov, D. M. Dzebisashvili // Phys. Scr. - 2020. - Vol. 95, Is. 6. - Ст. 065806, DOI 10.1088/1402-4896/ab8163. - Cited References: 57. - The work was financially supported by the Russian Foundation for Basic Research (project #18-02-00837, #20-32-70059), the Government of Krasnoyarsk Region, the Krasnoyarsk Regional Science and Technology Support Fund (projects: #18-42-240014 'One-orbit effective model of an ensemble of spin-polaron quasiparticles in the problem of describing the intermediate state and pseudogap behavior of cuprate superconductors' and #18-42-243002 'Manifestation of spin-nematic correlations in spectral characteristics of electronic structure and their influence on practical properties of cuprate superconductors'). The work of KKK was supported by the Council for Grants of the President of the Russian Federation (project MK-1641.2020.2). . - ISSN 0031-8949. - ISSN 1402-4896
Рубрики:
ELECTRONIC-STRUCTURE
   SUPERFLUID DENSITY
   QUASI-PARTICLES
   2-BAND MODEL
Кл.слова (ненормированные):
strongly correlated electron systems -- Mott-Hubbard materials -- high-temperature superconductivity -- spin-charge coupling -- Coulomb repulsion -- London penetration depth
Аннотация: We study the effect of Coulomb repulsion between oxygen holes on the London penetration depth λ based on the concept of spin-polaron nature of Fermi quasiparticles in cuprates superconductors. It is shown that for the generally accepted values of the parameters of the spin-fermion model, taking into account the Coulomb interaction, both the one-site Hubbard U p and interaction between holes on the next-nearest-neighbor oxygen ions V 2, allows one to achieve a much better agreement of the calculated temperature dependencies of the value λ −2 with the experimental data in La2−x Sr x CuO4 in a wide range around optimal doping.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Reshetnev Siberian State Univ Sci & Technol, Krasnoyarsk 660037, Russia.

Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Комаров, Константин Константинович; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-02-00837, 20-32-70059]; Government of Krasnoyarsk Region; Krasnoyarsk Regional Science and Technology Support Fund [18-42-240014, 18-42-243002]; Council for Grants of the President of the Russian Federation [MK-1641.2020.2]
}
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    Weak antiferromagnet iron borate FeBO3. classical object for magnetism and the state of the art / S. G. Ovchinnikov, V. V. Rudenko, N. V. Kazak [et al.] // J. Exp. Theor. Phys. - 2020. - Vol. 131, Is. 1. - P. 177-188, DOI 10.1134/S106377612007016X. - Cited References: 74. - This work was supported by the Russian Science Foundation, project no. 18-12-00022 . - ISSN 1063-7761. - ISSN 1090-6509
Рубрики:
ELECTRONIC-STRUCTURE
   TRANSITION
   RESONANCE
   FERROMAGNETISM
   DEPENDENCE
Аннотация: The simple lattice and magnetic structure, the high Neel temperature, the narrow antiferromagnetic resonance line of FeBO3, and the narrow electron paramagnetic resonance line of its isostructural diamagnetic analogs MBO3:Fe3+(M = Ga, In, Sc, Lu) make iron borate unique for investigations and applications. Iron borate is a model crystal for numerous experimental and theoretical studies, including spin crossovers and metallization at megabar pressures and many-electron effects in optics and X-ray spectroscopy. The recent works dealing with the investigation of the properties of FeBO(3)are reviewed.

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Публикация на русском языке Слабый ферромагнетик борат железа FeBO3. Классический объект для магнетизма и современное состояние исследований [Текст] / С. Г. Овчинников, В. В. Руденко, Н. В. Казак [и др.] // Журн. эксперим. и теор. физ. - 2020. - Т. 158 Вып. 1. - С. 184-197

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Rudenko, V. V.; Руденко, Валерий Васильевич; Kazak, N. V.; Казак, Наталья Валерьевна; Edelman, I. S.; Эдельман, Ирина Самсоновна; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Russian Science FoundationRussian Science Foundation (RSF) [18-12-00022]
}
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    Growth, Structure, and Optical Properties of Nonlinear LiGa0.55In0.45Te2 Single Crystals / P. Krinitsin [et al.] // Cryst. Growth Des. - 2019. - Vol. 19, Is. 3. - P. 1805-1814, DOI 10.1021/acs.cgd.8b01788. - Cited References: 43. - This work was supported by state assignment project #0330-2016-0008 and partially by the Russian Foundation of Basic Research (Grant Nos. 15-02-03408a, 17-45-540775r_a, and 17-52-53031), national scientific foundations of China (Grant Nos. 11474292, 51702330, 11611530680, 91622118, and 91622124), the special foundation of the director of Technical Institute of Physics and Chemistry (TIPC), the China "863" project (No. 2015AA034203) and the Youth Innovation Promotion Association, CAS (outstanding member for Z.L. and Grant 2017035 for X.J.). Some part of the experiments was performed in the multiple-access center "High-Resolution Spectroscopy of Gases and Condensed Matter" at the IA&E SBRAS (Novosibirsk, Russia). The authors are grateful to N. F. Beisel from the Analytical laboratory of the Nikolaev Institute of Inorganic Chemistry SB RAS for atomic-emission spectral analysis of the studied crystals. . - ISSN 1528-7483. - ISSN 1528-7505
   Перевод заглавия: Синтез, структура и оптические свойства нелинейнооптического кристалла LiGa0.55In0.45Te2

РУБ Chemistry, Multidisciplinary + Crystallography + Materials Science, Multidisciplinary
Рубрики:
PHASE-MATCHING PROPERTIES
ELECTRONIC-STRUCTURE
MID-IR
Аннотация: In search of new nonlinear optical crystals for the mid-IR range, we grew single crystals of LiGa0.55In0.45Te2 (LGITe) of optical quality; its structure was established, and the spectroscopic properties were studied. LGITe crystallizes in a tetragonal chalcopyrite-like (I4̅2d) structure at 667 ± 5 °C. Crystals are transparent in the 0.76–14.8 μm spectral region with some absorption bands related to OH/H2O and Ge–O vibrations. Analysis of the Tauc plots showed that LGITe is a direct band gap semiconductor with the band gap Eg = 1.837 eV at 300 K. The Raman spectrum for LGITe is very similar to that for LiGaTe2: the most intense band A1 near 120 cm–1 corresponds to the Li–Te vibration. DFT calculations were carried out for the first time to simulate the energy band structure (band gap ∼1.67 eV), density of states (DOS), birefringence (0.049 at 2 μm), and nonlinear susceptibility (d14 = d36 = −48.73 pm/V). For ternary LiInTe2 these parameters are Δn = 0.007 and d14 = d36 = −61.4 pm/V, respectively. The calculated optical properties indicate that LiGa0.55In0.45Te2 is a promising mid-IR nonlinear optical crystal with nonlinear parameters higher than those of LiGaTe2.

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Держатели документа:
Sobolev Inst Geol & Mineral SB RAS, 3 Ac Koptyug Ave, Novosibirsk 630090, Russia.
Novosibirsk State Univ, 2 Pyrogova Str, Novosibirsk 630090, Russia.
Chinese Acad Sci, Tech Inst Phys & Chem, Beijing 100190, Peoples R China.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Univ Chinese Acad Sci, Beijing 100190, Peoples R China.
Inst Automat & Electrometry SB RAS, Novosibirsk 630090, Russia.

Доп.точки доступа:
Krinitsin, Pavel; Yelisseyev, Alexander; Jiang, Xingxing; Isaenko, Lyudmila; Molokeev, M. S.; Молокеев, Максим Сергеевич; Lin, Zheshuai; Pugachev, Alexey; Russian Foundation of Basic Research [15-02-03408a, 17-45-540775r_a, 17-52-53031]; national scientific foundations of China [11474292, 51702330, 11611530680, 91622118, 91622124]; special foundation of the director of Technical Institute of Physics and Chemistry (TIPC); China "863" project [2015AA034203]; Youth Innovation Promotion Association, CAS [2017035]; [0330-2016-0008]
}
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    A novel red-emitting La2CaHfO6:Mn4+ phosphor based on double perovskite structure for pc-WLEDs lighting / G. C. Xing [et al.] // CrystEngComm. - 2019. - Vol. 21, Is. 23. - P. 3605-3612, DOI 10.1039/c9ce00556k. - Cited References: 47. - This work is financially supported by the National Natural Science Foundation of China (NSFC No. 51672259). . - ISSN 1466-8033
   Перевод заглавия: Новый красный люминофор La2CaHfO6: Mn4+ на основе структуры двойного перовскита для светодиодных ламп pc-WLED

РУБ Chemistry, Multidisciplinary + Crystallography
Рубрики:
LUMINESCENCE PROPERTIES
   ELECTRONIC-STRUCTURE
   OPTICAL-PROPERTIES
   SITE
Аннотация: Non-rare earth doped oxides with red emission are one of the current research hotspots for achieving the warm white light range in the phosphor converted white light emitting diodes (pc-WLEDs) field. In the current work, a novel Mn4+-activated La2CaHfO6 red phosphor is reported for the first time and its crystal structure is analyzed by Rietveld refinement. The photoluminescent properties of La2CaHfO6:Mn4+ are investigated in detail with the help of diffuse refletance spectroscopy, photoluminescence spectroscopy, and temperature-dependent PL spectroscopy. Based on the diffuse refletance spectra, the calculated optical band gap for La2CaHfO6 is 4.9 eV, indicating that La2CaHfO6 could be a suitable host for activators' doping. Under 380 nm near-ultraviolet (n-UV) light excitation, the as-prepared La2CaHfO6:Mn4+ displays intense red emission centered at 693 nm. Through an accurate calculation of Dq/B (2.47) and nephelauxetic effect β1 (0.949), the origination of strong crystal field (CF) and deep-red emission is demonstrated. By combining the representative La2CaHfO6:0.002Mn4+, blue BAM:Eu2+, and green (Ba,Sr)2SiO4:Eu2+ phosphors with a 380 nm UV chip to fabricate the pc-WLEDs device, a white light is obtained with low correlated color temperature (CCT = 5165 K) and high color rendering index (Ra = 87.8), demonstrating that the as-prepared La2CaHfO6:Mn4+ phosphors can be used as red-emitting candidate in pc-WLEDs lighting.

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Держатели документа:
China Univ Geosci, Fac Mat Sci & Chem, Minist Educ, Engn Res Ctr Nanogeomat, 388 Lumo Rd, Wuhan 430074, Hubei, Peoples R China.
FRC KSC SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Xing, Gongcheng; Feng, Yuxin; Gao, Zhiyu; Tao, Mengxuan; Wang, Hongquan; Wei, Y.i.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Li, Guogang
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    Structure and optical properties of the Li2In2GeSe6 crystal / A. P. Yelisseyev [et al.] // J. Phys. Chem. C. - 2018. - Vol. 122, Is. 30. - P. 17413-17422, DOI 10.1021/acs.jpcc.8b02799. - Cited References: 49. - This work was supported by state assignment project #0330-2016-0008 and partly by the Russian Foundation of Basic Research (grants nos. 15-02-03408a, 17-45-540775r_a, and 17-52-53031), National Scientific Foundations of China (grants 11474292, 51702330, 11611530680, 91622118, and 91622124), the special foundation of the director of Technical Institute of Physics and Chemistry (TIPC), the China "863" project (no. 2015AA034203), and the Youth Innovation Promotion Association, CAS (outstanding member for Z.L. and grant 2017035 for X.J.). . - ISSN 1932-7447
   Перевод заглавия: Структура и оптические свойства в кристалле Li2In2GeSe6

РУБ Chemistry, Physical + Nanoscience & Nanotechnology + Materials Science, Multidisciplinary
Рубрики:
PHASE-MATCHING PROPERTIES
TEMPERATURE-DEPENDENCE
ELECTRONIC-STRUCTURE
Аннотация: Intense search for new nonlinear optical crystals for the mid-infrared region is in progress, and Li-containing quaternary chalcogenides are expected to improve transparency range, stability, phase-matching conditions, and other parameters in comparison with commercially available AgGaS2, AgGaSe2, and ZnGeP2. Single crystals of Li2In2GeSe6 up to 8 mm in size were obtained by the Bridgman- Stockbarger growth technique, and their high quality was confirmed by exciton luminescence. A monoclinic structure and direct band-to-band electronic transitions were established, and the thermal expansion was shown to be virtually isotropic. Defect-related absorption and luminescence were revealed, and the way to lower them was suggested. The electronic structure, density of states, and some optical properties were calculated from the first principles for Li2In2GeSe6. The calculated nonlinear coefficients and rather large birefringence indicate a strong phase-matching ability. These investigations demonstrate that Li2In2GeSe6 is a promising mid-infrared nonlinear optical crystal.

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Держатели документа:
RAS, Sobolev Inst Geol & Mineral, 3 Ac Koptyug Ave, Novosibirsk 630090, Russia.
Novosibirsk State Univ, 2 Pyrogova St, Novosibirsk 630090, Russia.
RAS, SB, KSC, Lab Crystal Phys,Kirensky Inst Phys,Fed Res Ctr, Krasnoyarsk 660036, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Chinese Acad Sci, Tech Inst Phys & Chem, Beijing 100190, Peoples R China.
Univ Chinese Acad Sci, Beijing 100190, Peoples R China.

Доп.точки доступа:
Yelisseyev, A. P.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Jiang, Xingxing; Krinitsin, P. G.; Isaenko, L. I.; Lin, Zheshuai; Russian Foundation of Basic Research [15-02-03408a, 17-45-540775r_a, 17-52-53031]; National Scientific Foundations of China [11474292, 51702330, 11611530680, 91622118, 91622124]; special foundation of the director of Technical Institute of Physics and Chemistry (TIPC); China "863" project [2015AA034203]; Youth Innovation Promotion Association, CAS [2017035]; [0330-2016-0008]
}
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    Preparation and characterization of colloidal copper xanthate nanoparticles / Y. Mikhlin [et al.] // New J. Chem. - 2016. - Vol. 40, Is. 4. - P. 3059-3065, DOI 10.1039/c6nj00098c. - Cited References:50. - This research was supported by the Russian Science Foundation grant 14-17-00280. We thank Dr Roberto Felix Duarte (HZB) and bilateral program "German-Russian laboratory at BESSY II" for assistance with the X-ray absorption experiments. . - ISSN 1144-0546. - ISSN 1369-9261
   Перевод заглавия: Получение и исследование коллоидных наночастиц ксантогената меди

РУБ Chemistry, Multidisciplinary
Рубрики:
X-ray-absorption
   Self-assembled monolayers
   Sulfide nanoparticles
   Electronic-structure
   Waste-water
   Complexes
   Flotation
   Spectroscopy
   Adsorption
   Oxidation
Аннотация: Despite the important role of metal xanthates in a number of industrial processes and emerging applications, no attempts have been made to prepare the metal xanthate nanoparticles and to study colloidal solutions of insoluble heavy metal xanthates. Here, we examined the formation of colloidal copper xanthate particles during the reactions of aqueous solutions of cupric sulfate and various potassium xanthates, which occur in flotation and water treatment slurries and can be used to manufacture nanoparticles for materials science (e.g., as precursors for copper sulfide nanoparticles and biomedicine). The products were characterized using UV-vis absorption, dynamic light scattering, zeta potential measurements, transmission electron microscopy (TEM), electron diffraction, Fourier transform infrared spectroscopy, thermogravimetry, X-ray photoelectron spectroscopy, and X-ray absorption spectroscopy (XANES). Colloidal copper xanthates with compositions of ROCSSCu (R = ethyl, isopropyl, butyl, isobutyl, and amyl groups), disordered structures and average diameters of 20–80 nm easily formed and aggregated and were stable for at least several hours, especially if excessive xanthate was used. The hydrodynamic diameters of the nanoparticles were smaller at lower temperatures. Dixanthogens, which were produced in the reactions along with ROCSSCu, seemed to promote nanoparticle aggregation and precipitated with the copper xanthate, affecting their thermal decomposition. The TEM micrographs and S K- and Cu K-edge XANES spectra revealed core/shell particle morphologies, likely with Cu(I) bonded to four S atoms in the core and reduced copper coordination in the shell.

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Держатели документа:
Russian Acad Sci, Inst Chem & Chem Technol, Siberian Branch, Akad 50-24, Krasnoyarsk 6600036, Russia.
Siberian Fed Univ, Svobodny Pr 79, Krasnoyarsk 660041, Russia.
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Akad 50-38, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Mikhlin, Y. L.; Михлин, Юрий Леонидович; Vorobyev, S.; Saikova, S. V.; Сайкова, С. В.; Tomashevich, Y.; Fetisova, O.; Kozlova, S.; Zharkov, S. M.; Жарков, Сергей Михайлович; Russian Science Foundation [14-17-00280]
}
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Giant red shift of the absorption spectra due to nonstoichiometry in GdCoO3–δ / S. G. Ovchinnikov [et al.] // JETP Letters. - 2016. - Vol. 103, Is. 3. - P. 161-166, DOI 10.1134/S0021364016030115. - Cited References:40. - This work was supported by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project no. NSh-2886.2014.2), by the Presidium of Russian Academy of Sciences (Program 34), by the Russian Foundation for Basic Research (project nos. 16-02-00507, 16-02-00273, 16-02-00098, and 14-02-00186), and by Internationale Buro, Bundesministerium fur Bildung und Forschung (BMBF, grant no. 05K12GU2). . - ISSN 0021-3640. - ISSN 1090-6487

РУБ Physics, Multidisciplinary
Рубрики:
TRANSITION-METAL COMPOUNDS
   TOTAL-ENERGY CALCULATIONS
   AUGMENTED-WAVE METHOD
   ELECTRONIC-STRUCTURE
   MAGNETIC-PROPERTIES
   SPIN TRANSITION
   BAND-GAPS
   BASIS-SET
   LaCoO3
   OXIDES
Аннотация: The GdCoO3–δ perovskite is a semiconductor with the energy gap Eg ≈ 0.5 eV from electrical transport measurements. It reveals unusual optical absorption spectra without transparency window expected for semiconductors. Instead we have measured the narrow transmittance peak at the photon energy ε0 = 0.087 eV. To reconcile the transport and optical data we have studied the effect of oxygen vacancies on the electronic structure of the GdCoO3–δ. We have found that oxygen vacancies result in the in-gap states inside the charge-transfer energy gap of the GdCoO3. It is a multielectron effect due to strong electron correlations forming the electronic structure of the GdCoO3–δ. These in-gap states decrease the transparency window and result in a narrow absorption minimum. The predicted temperature dependence of the absorption spectra has been confirmed by our measurements.

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Публикация "на русском языке" Giant red shift of the absorption spectra due to nonstoichiometry in GdCoO3–δ [Текст] / S. G. Ovchinnikov [и др.] // Письма в Журн. эксперим. и теор. физ. : Наука, 2016. - Т. 103 Вып. 3-4. - С. 177-183

Держатели документа:
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Siberian State Technol Univ, Krasnoyarsk 660049, Russia.

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Orlov, Yu. S.; Орлов, Юрий Сергеевич; Kuzubov, A. A.; Кузубов, Александр Александрович; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Sokolov, A. E.; Соколов, Алексей Эдуардович; Zabluda, V. N.; Заблуда, Владимир Николаевич; Naumov, S. B.; Shestakov, N. P.; Шестаков, Николай Петрович; Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools [NSh-2886.2014.2]; Presidium of Russian Academy of Sciences [34]; Russian Foundation for Basic Research [16-02-00507, 16-02-00273, 16-02-00098, 14-02-00186]; Internationale Buro, Bundesministerium fur Bildung und Forschung (BMBF) [05K12GU2]
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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.

Effect of external pressure on the normal and superconducting properties of high-Tc cuprates / K. A. Sidorov [et al.] // Phys. Status Solidi B. - 2016. - Vol. 253, Is. 3. - P. 486-493, DOI 10.1002/pssb.201552465. - Cited References: 50. - We are thankful to Dr. M.M. Korshunov for useful discussions. This work was supported by RFBR Grants 13-02-01395, 14-02-00186, grant of Russian President NSh-2886.2014.2, and the Ministry of Education and Science of Russia (SibFU Government Contract for 2014-2016, No. 3085). . - ISSN 0370-1972

РУБ Physics, Condensed Matter
Рубрики:
HYDROSTATIC-PRESSURE
   ELECTRONIC-STRUCTURE
   EXCHANGE INTERACTION
   HEISENBERG-MODEL
   COPPER OXIDES
   FERMI-SURFACE
   SPIN-WAVE
Кл.слова (ненормированные):
cuprates -- electronic structure -- Fermi surface -- Lifshitz transitions -- strongly correlated electrons -- superconducting properties
Аннотация: The pressure effects on the normal state electronic structure, the superexchange interaction, and the critical temperature of d-type superconductivity mediated by magnetic pairing have been studied within the multielectron hybrid scheme LDA+GTB that takes into account electron correlations in CuO2 planes. We have found the changes of the multiband p–d model parameters at 3% compression of different symmetry: (i) hydrostatic, (ii) along the c-axis, and (iii) in a–b plane. We have studied the changes of the Fermi surface under external pressure for different hole doping concentration x. In general, this effect is too small except two critical concentrations xc1≈0.15 and xc2=0.24 where the Lifshitz transitions occur with the change of the Fermi surface topology. In the vicinity of the critical concentration, we have found the giant change of the Fermi surface area up to 100% related to the pressure-induced Lifshitz transition. The effects of pressure on the antiferromagnetic coupling J and the mean-field value of Tc are obtained in a good agreement to experimental data.

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Доп.точки доступа:
Sidorov, K. A.; Сидоров, Кирилл Александрович; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Nikolaev, S. V.; Николаев, Сергей Викторович; Pchelkina, Z. V.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
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