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1.
A comparative study
of the structure of
copper
and lead xanthates / S. A. Vorobyev [et al.]> // J. Struct. Chem. - 2017. -
Vol. 58
,
Is. 6
. - P. 1144-1151,
DOI
10.1134/S0022476617060117. - Cited References: 38 . - ISSN 0022-4766
Кл.слова (ненормированные):
copper
xanthate
--
lead xanthate
--
dixanthogen
--
structure
--
XPS
--
EXAFS
--
solid state NMR
Аннотация:
XPS, PbL3 and CuK EXAFS, solid state NMR, and EPR techniques are used to study insoluble products formed in the interaction of aqueous solutions of lead(II) nitrate and
copper
(II) sulfate with potassium nbutylxanthate (KX). The XPS spectra of lead xanthates with the composition PbX2 are similar to those of KX, and interatomic distances of 0.279 nm suggest a nearly ionic character of Pb–S bonds. In
copper
xanthate precipitating together with dixanthogen (approximately 15 wt.%), the Cu(I)–S bond length is smaller (0.229 nm), and
copper
coordination number of 2.9 in a composite with dixanthogen increases to 3.3 after its removal by washing with acetone. The XPS spectra indicate the covalent character of the bond and non-equivalence of xanthate radicals. Solid state 1H and 13C NMR spectra as well as the actual absence of metal lines under the measurement conditions demonstrate strong disordering of the structure of xanthates, which is stronger for PbX2 and weakest in CuX after the removal of dixanthogen. EPR reveals sulfur-containing radicals and Cu2+ in CuX, however, their amounts are insignificant and decrease after the washing with acetone. The results of the work are significant for the understanding of the reactivity of xanthates, in particular, under the conditions of flotation of base metal ores.
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Публикация на русском языке
Сравнительное исследование структуры ксантогенатов меди и свинца [Текст] / C. А. Воробьев [и др.] // Журн. структ. химии. - 2017. - Т. 58 № 6. - С. 1191-1198
Держатели документа:
Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russian Federation
Kirensky Insitute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Доп.точки доступа:
Vorobyev, S. A.; Saikova, S. V.; Erenburg, S. B.; Trubina, S. V.; Ivanov, Y. N.; Иванов, Юрий Николаевич; Maksimov, N. G.; Mikhlin, Y. L.
}
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2.
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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3.
A complex of
ceftriaxone with Pb(II): synthesis, characterization, and antibacterial activity study / A. O. Lykhin [et al.]> // J. Coord. Chem. - 2014. -
Vol. 67
,
Is. 16
. - З. 2783-2794,
DOI
10.1080/00958972.2014.938065. - Cited References: 48. - The reported study was supported by RFBR, research project No. 14-03-31, 170 MOJI_a and Krasnoyarsk regional fund for supporting scientific and technological activities. We thank the Center for Equipment Joint Use of the Siberian Federal University. We are grateful to the HPC Research Departments of Siberian Federal University and Moscow University Supercomputing Center (SKIF MSU "Chebyshev") for the access to the high-performance computer clusters. . - ISSN 0095-8972. - ISSN 1029-0389
РУБ
Chemistry, Inorganic & Nuclear
Рубрики:
BETA-LACTAM ANTIBIOTICS
TERNARY COMPLEX
METAL-COMPLEXES
BASIS-SETS
3 DECADES
RESISTANCE
COPPER
(II)
CEPHALOSPORINS
EVOLUTION
1ST-ROW
Кл.слова (ненормированные):
Ceftriaxone lead(II) complex
--
DFT
--
IR spectroscopy
--
TGA
--
Antibacterial screening
Аннотация:
A Pb(II) complex with ceftriaxone (H2Ceftria) antibiotic was synthesized by reaction of ceftriaxone disodium salt (hemi)heptahydrate with lead nitrate in water–ethanol medium. The complex was characterized on the basis of complexometric titration, spectrophotometric and thermogravimetric analyses, capillary electrophoresis, IR, Raman and UV–vis spectroscopies, and density functional theory calculations. Pb(II) is five-coordinate with distorted square pyramidal geometry. The coordination of Ceftria2− to Pb(II) occurs through N and O of the triazine, lactam carbonyl, carboxylate, and amine groups. The antibacterial activity study showed that Klebsiella pneumoniae is resistant to [Pb(Ceftria)]·3H2O. The antibacterial activity of [Pb(Ceftria)]·3H2O against Staphylococcus aureus is reduced compared with ceftriaxone. In contrast, the antibacterial activity of [Pb(Ceftria)]·3H2O against Escherichia coli is 28% higher than that of ceftriaxone antibiotic.
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Держатели документа:
Siberian Fed Univ, Dept Chem, Krasnoyarsk, Russia
Siberian State Aerosp Univ, Informat Sci & Telecommun Inst, Krasnoyarsk, Russia
Russian Acad Sci, LV Kirensky Inst Phys, Siberian Branch, Krasnoyarsk, Russia
Siberian State Technol Univ, Dept Phys, Krasnoyarsk, Russia
Univ Nevada, Dept Chem, Reno, NV 89557 USA
Доп.точки доступа:
Lykhin, A. O.; Лыхин А. О.; Novikova, G. V.; Новикова Г. В.; Kuzubov, A. A.; Кузубов, Александр Александрович; Staloverova, N. A.; Сталоверова Н. А.; Sarmatova, N. I.; Сарматова Н. И.; Varganov, S. A.; Варганов, Сергей Александрович; Krasnov, P. O.; Краснов, Павел Олегович; RFBR [14-03-31, 170 MOJI_a]
}
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4.
A neutron scattering
and mu SR investigation of the magnetic phase transitions of CuB2O4 / M. . Boehm [et al.]> // Physica B. - 2002. -
Vol. 318
: 6th Patras-University Euroconference on Properties of Condensed Matter Probed with X-Ray Scattering-Electron Correlations and Magnetism (SEP 21-25, 2001, PATRAS, GREECE),
Is. 4
. - P. 277-281,
DOI
10.1016/S0921-4526(02)00788-3. - Cited References: 8 . - ISSN 0921-4526
РУБ
Physics, Condensed Matter
Рубрики:
COPPER
METABORATE
Кл.слова (ненормированные):
magnetic soliton lattice
--
Dzyaloshinskii-Moriya interaction
--
neutron diffraction
--
mu SR
Аннотация:
We have investigated the magnetic ground state in CuB2O4,
copper
metaborate, by means of neutron diffraction and muSR measurements. At T-N = 21 K CuB2O4 undergoes a second-order phase transition from a paramagnetic to an antiferromagnetic commensurate state followed by a second transition at T* = 10 K where the two magnetic sublattices form a soliton lattice, as reported earlier. We give a detailed analysis of the magnetic structure in the commensurate phase which is found to be different from the one published recently. New experimental results are presented which show the existence of a third transition below T approximate to 1.8 K. The magnetic structure remains incommensurate at very low temperatures, but a re-distribution of the magnetic intensities is observed in the neutron diffraction data set which suggests that the phases between the Cu2+ spins are changed. (C) 2002 Elsevier Science B.V. All rights reserved.
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Держатели документа:
Inst Laue Langevin, F-38042 Grenoble 9, France
Swiss Fed Inst Technol, Lab Neutron Scattering, CH-5232 Villigen, Switzerland
Paul Scherrer Inst, CH-5232 Villigen, Switzerland
Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland
Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland
RAS, Inst Phys SB, Krasnoyarsk 660036, Russia
ИФ СО РАН
Доп.точки доступа:
Boehm, M.; Roessli, B.; Schefer, J.; Ouladdiaf, B.; Amato, A.; Baines, C.; Staub, U.; Petrakovskii, G. A.; Петраковский, Герман Антонович
}
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5.
Aleksandrov, K. S.
Hierarchies of perovskite-like crystals (Review) / K. S. Aleksandrov, V. V. Beznosikov> // Phys. Solid State. - 1997. -
Vol. 39
,
Is. 5
. - P. 695-715,
DOI
10.1134/1.1130120. - Cited References: 143 . - ISSN 1063-7834
Рубрики:
CU-O SYSTEM
HIGH-PRESSURE SYNTHESIS
SUPERCONDUCTING
COPPER
OXIDES
STRUCTURAL PHASE-TRANSITIONS
NEUTRON POWDER DIFFRACTION
SINGLE-CRYSTAL
X-RAY
CUPRATE SUPERCONDUCTORS
DIELECTRIC-PROPERTIES
HOMOLOGOUS SERIES
Аннотация:
A system of mutual relationships (a hierarchy) is constructed between various perovskite-like crystal structures based on available structural data. All the perovskite-like structures are characterized by a common indicator of their relationship-the presence of layers, stacks, or frameworks made up of BX6 octahedra linked at their vertices (where B is a cation, X is an anion) or fragments of octahedra in the form of BX5 pyramids or BX4 squares in anion-deficient compounds. In layered structures, these stacks are joined to each other by various intermediate blocks. It is well known that one homological series of compounds is constructed by increasing the number of layers in a stack while preserving the same kind of connecting block. Crystals of various series that contain identical stacks (but different blocks of one or two types) can also be related to one another via this feature. The hierarchical system includes compounds with small distortions in their structures for various reasons. (C) 1997 American Institute of Physics.
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Публикация на русском языке
Александров, Кирилл Сергеевич. Иерархия перовскитоподобных кристаллов (Обзор) [Текст] / К. С. Александров, Б. В. Безносиков // Физ. тверд. тела. - Санкт-Петербург, 1997. - Т. 39 Вып. 5. - С. 785-808
Доп.точки доступа:
Beznosikov, B. V.; Безносиков, Борис Валерьевич; Александров, Кирилл Сергеевич
}
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6.
Analysis of function
of
copper
sulfide nanoparticles as sphalerite flotation activator / S. A. Vorob’ev, E. A. Burdakova, A. A. Sarycheva [et al.]> // J. Min. Sci. - 2021. -
Vol. 57
,
Is. 1
. - P. 144-153,
DOI
10.1134/S1062739121010154. - Cited References: 22. - This study was supported by the Russian Science Foundation, project no. 18-17-00135 . - ISSN 1062-7391
Кл.слова (ненормированные):
nanoparticles
--
copper
sulfide
--
flotation
--
sphalerite
--
activators
--
dynamic light scattering
--
X-ray photoelectron spectroscopy
Аннотация:
The authors compare the effect exerted by
copper
ions and sulphide
copper
nanoparticles on flotation of Gorevka deposit sphalerite using potassium n-butyl xanthate and in reagent-less regime. Covelline-like colloid particles 4–8 nm in size, obtained in interaction of
copper
(II) and sulfide ions in aqueous solutions, are characterized using the methods of dynamic light scattering, electron microscopy and diffraction. Sphalerite surface after reaction with
copper
ions and CuS dispersoid solutions are described by zeta-potential measurements and X-ray photoelectron spectroscopy. It is found that sphalerite flotation after activation with nanoparticles is lower than with
copper
ion solutions of the same concentrations, and improves with increasing duration of activation and flotation processes. The mechanism of CuS nanoparticles consists in creation of active centers for the collector to attach to, which intensifies the hydrophobic behavior and adsorption of the collector. Moreover, CuS nanoparticles promote formation of a special microrelief of the solid–liquid interface, which ensures rupture of liquid film and attachment of sphalerite particles to air bubbles when they collide.
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Публикация на русском языке
Изучение действия наночастиц сульфида меди как активатора флотации сфалерита [Текст] / С. А. Воробьев, Е. А. Бурдакова, И. В. Сарычева [и др.] // Физ.-техн. проблемы разраб. полез. ископаемых. - 2021. - № 1. - С. 159-168
Держатели документа:
Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk Science Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk Science Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, 660037, Russian Federation
Доп.точки доступа:
Vorob’ev, S. A.; Burdakova, E. A.; Sarycheva, A. A.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Karacharov, A. A.; Likhatskii, M. N.; Mikhlin, Y. L.
}
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7.
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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8.
Antiferromagnetic dichroism in
a complex multisublattice magnetoelectric CuB2O4 / K. N. Boldyrev [et al.]> // Phys. Rev. Lett. - 2015. -
Vol. 114
,
Is. 24
. - Ст. 247210,
DOI
10.1103/PhysRevLett.114.247210. - Cited References:40. - This study was supported by the Russian Academy of Sciences under the Programs for Basic Research, by the President of the Russian Federation (Grant No. MK-3521.2015.2, K. N. B.), by the Russian Foundation for Basic Research (Grants No. 15-32-20613, K. N. B., and No. 15-02-04222, R. V. P.), and by the Ministry of Education and Science of the Russian Federation (Grant No. 14.B25.0031.25, R. V. P.). . - ISSN 0031. - ISSN 1079-7114
Перевод заглавия:
Антиферромагнитный дихроизм в сложном многоподрешеточном магнетоэлектрике CuB2O4
РУБ
Physics, Multidisciplinary
Рубрики:
MAGNETIC SOLITON LATTICE
COPPER
METABORATE
GYROTROPIC BIREFRINGENCE
SPECTROSCOPY
EXCITATIONS
TRANSITIONS
CRYSTALS
Cr2O3
FIELD
Аннотация:
Magnetic control of the crystal chirality was announced by Saito et al. [Phys. Rev. Lett. 101, (2008)] on the ground of experiments in CuB2O4. This claim has raised a sharp dispute in the literature because it seemed to contradict the fundamental symmetry principles. We settle this dispute on the basis of a high-resolution optical spectroscopy study of excitonic transitions in CuB2O4. We find that a large sublattice-sensitive antiferromagnetic linear dichroism (LD) emerges at the Néel temperature TN=21 K and show how it could simulate a “magnetic-field control of the crystal chirality.” We prove that the discovered LD is related microscopically to the magnetic Davydov splitting. This LD is highly sensitive to subtle changes in the spin subsystems, which allowed us to observe a splitting of the phase transition into an incommensurate magnetic phase into two transitions (T∗1=8.5 and T∗2=7.9 K) and to suggest elliptical spiral structures below T∗1, instead of a simple circular helix proposed earlier.
О магнитном контроле кристаллической хиральности сообщил Сайто и др. [Phys. Rev. Lett. 101, 117402 (2008)] на основании экспериментов в CuB2O4. Это требование вызвало резкий спор в литературе, потому что это казалось, противоречат основным принципам симметрии. Мы урегулировать этот спор на основе исследования с помощью оптической спектроскопии высокого разрешения экситонных переходов в CuB2O4. Мы считаем, что большой подрешетко-чувствительный антиферромагнитный линейный дихроизм (LD) возникает при температуре Нееля TN= 21 Kи показываем, как это может имитировать "контроль магнитным полем кристаллической хиральности." Мы докажем, что обнаруженный LD связанс микроскопическим магнитным Давыдовским расщеплением. Этот Л.Д. весьма чувствителен к тонким изменениям в спиновых подсистем, которые позволили нам наблюдать расщепление фазового перехода в несоизмеримы магнитная фаза в двух переходов (T*1= 8,5 и Т*2 = 7,9 К) и предположить эллиптическую спиральную структуру ниже T*1, вместо простой круговой спирали предложенный ранее.
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Держатели документа:
RAS, Inst Spect, Moscow 142190, Russia.
RAS, Ioffe Phys Tech Inst, St Petersburg 194021, Russia.
RAS, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Доп.точки доступа:
Boldyrev, K. N.; Pisarev, R. V.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Popova, M. N.; Russian Academy of Sciences under the Programs for Basic Research; Russian Federation [MK-3521.2015.2]; Russian Foundation for Basic Research [15-32-20613, 15-02-04222]; Ministry of Education and Science of the Russian Federation [14.B25.0031.25]
}
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9.
Aplesnin, S. S.
Formation of a spin density wave in
copper
metaborate by a spin polaron / S. S. Aplesnin> // J. Phys.: Condens. Matter. - 2004. -
Vol. 16
,
Is. 32
. - P. 5907-5914,
DOI
10.1088/0953-8984/16/32/023. - Cited References: 12 . - ISSN 0953-8984
РУБ
Physics, Condensed Matter
Рубрики:
SOLITON LATTICE
CUB2O4
Кл.слова (ненормированные):
Absorption
--
Correlation methods
--
Electric fields
--
Infrared radiation
--
Magnetization
--
Mathematical models
--
Polarons
--
Specific heat
--
Intraband transition
--
Optical conductivity
--
Spin density waves
--
Spin polaron
--
Copper
compounds
Аннотация:
Formation of incommensurate three-dimensional magnetic order below T* similar to 10 K in CuB2O4 is explained on the basis of strong correlation between the holes and localized spins. The Kondo lattice model is analysed for the case where spin polarons are the elementary excitations. The origin of the low-temperature specific heat maximum at T similar to 5 K is associated with a displacement of the polaron band bottom. A set of anomalies in the temperature dependence of the conductivity, shift of the optical conductivity maximum in the range of energies 0.02-0.12 eV and decreasing of the infrared absorption intensity is predicted.
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Держатели документа:
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Доп.точки доступа:
Аплеснин, Сергей Степанович
}
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10.
Aplesnin, S. S.
Static and dynamic magnetic properties of coupled spin-1/2 antiferromagnetic chains / S. S. Aplesnin> // J. Phys.: Condens. Matter. - 2000. -
Vol. 12
,
Is. 37
. - P. 8191-8207,
DOI
10.1088/0953-8984/12/37/316. - Cited References: 21 . - ISSN 0953-8984
РУБ
Physics, Condensed Matter
Рубрики:
ONE-DIMENSIONAL ANTIFERROMAGNETS
SYSTEMS
SUSCEPTIBILITY
EXCITATIONS
SR2CUO3
CA2CUO3
KCUF3
Кл.слова (ненормированные):
Computational methods
--
Copper
compounds
--
Correlation methods
--
Functions
--
Magnetic field effects
--
Magnetic properties
--
Magnetization
--
Monte Carlo methods
--
Quantum theory
--
Specific heat
--
Thermal effects
--
Excitation spectroscopy
--
Interchain coupling
--
Intrachain couplings
--
Mean-field approximation
--
Spin-spin correlation function
--
Spinons
--
Antiferromagnetic materials
Аннотация:
Calculations of the thermodynamic quantities, and the spectra of spinons, triplet excitations, and two-particle spin-singlet (Delta S-z = 0, +/- 1) excitations for a weakly coupled antiferromagnetic S = 1/2 spin chain are made using a mean-field approximation for the interchain couplings (J(2)) by the quantum Monte Carlo method. The mass gaps in these excitation spectra are estimated as functions of the interchain coupling. The critical held H-c, and the temperatures at which the spinon and singlet gaps close (T-1 and T-2, respectively) are obtained. Some peculiarities of the staggered magnetization, the specific heat, and the spin-spin correlation function are found at T-1 = 0.9J(2), T-2 = 1.5J(2), H-c = 3.8J(2), as determined by linear function fitting for J(2)/J(1) < 0.15 The intrachain and interchain couplings, and the staggered magnetization for KCuF3, Sr2CuO3, and Ca2CuO3 are estimated, and mass gaps are predicted to exist in the spectra of the spinons and the singlet two-particle excitations.
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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
L V Kirensky Institute of Physics, Siberian Br. Russ. Acad. of Sci., Krasnoyarsk, 660036, Russian Federation
Доп.точки доступа:
Аплеснин, Сергей Степанович
}
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11.
Avramov, P. V.
Effects of strong electron correlations in X-ray and electron spectra of high-T-c superconductors / P. V. Avramov, S. G. Ovchinnikov> // Phys. Solid State. - 2000. -
Vol. 42
,
Is. 5
. - P. 788-809,
DOI
10.1134/1.1131293. - Cited References: 92 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTORS
COPPER
-OXIDE SUPERCONDUCTORS
MULTIPLE-SCATTERING ANALYSIS
HIGH-ENERGY SPECTROSCOPY
ABSORPTION-SPECTRA
PHOTOELECTRON-SPECTRA
EDGE STRUCTURE
PHOTOEMISSION SPECTRA
INCOMPLETE SHELL
SINGLE-CRYSTAL
Аннотация:
The current state of theoretical and experimental studies on the electronic structure of high-T-c superconductors is analyzed. The agreement between the theory and experimental spectroscopic data is shown to be rather poor in certain cases. The reason is that the X-ray and electronic spectra reveal strong electron correlations. At the same time, no realistic model has been developed up to now in which both one-electron and multielectron mechanisms of the formation of the spectra could be described in a unified way in compounds containing transition and rare-earth elements. In this paper, particular attention is paid to a sudden-perturbation model, by which it has been possible to describe or interpret some X-ray and electronic spectra, including both one-electron and multielectron effects. (C) 2000 MAIK "Nauka/Interperiodica".
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Держатели документа:
Russian Acad Sci, Siberian Div, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Аврамов, Павел Вениаминович
}
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12.
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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13.
B-11-NMR study of
low-temperature phase transition in CuB2O4 / Y. . Yasuda [et al.]> // J. Phys.: Condens. Matter. - 2007. -
Vol. 19
: International Conference on Highly Frustrated Magnetism (AUG 15-19, 2006, Osaka, JAPAN),
Is. 14
. - Ст. 145277,
DOI
10.1088/0953-8984/19/14/145277. - Cited References: 10 . - ISSN 0953-8984
РУБ
Physics, Condensed Matter
Рубрики:
COPPER
METABORATE
Кл.слова (ненормированные):
Copper
compounds
--
Low temperature effects
--
Magnetic field effects
--
Nuclear magnetic resonance
--
B T phase diagram
--
Dzialoshinskii Moriya interaction
--
Phase transitions
Аннотация:
The material CuB2O4 presents a variety of phases in the B - T phase diagram, caused by the frustration and the Dzialoshinskii - Moriya interaction. In order to investigate the nature of the phase transitions, a B-11- NMR experiment on CuB2O4 has been performed under an applied magnetic field along the a- axis down to 0.4 K. A new incommensurate - incommensurate phase transition has been found at 0.8 K under a field of 0.5 T. Further, another phase transition has been observed at 4.7 K under a field of about 2 T, which is consistent with the transition reported by the neutron diffraction experiment.
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Держатели документа:
Univ Fukui, Dept Appl Phys, Fukui 9108507, Japan
Japan Adv Inst Sci & Technol, Ishikawa 9231292, Japan
RAS, SB, Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Department of Applied Physics, University of Fukui, Fukui 910-8507, Japan
Japan Advanced Institute of Science and Technology, Ishikawa 923-1292, Japan
Institute of Physics, SB RAS, 660036 Krasnoyarsk, Russian Federation
Доп.точки доступа:
Yasuda, Y.; Nakamura, H.; Fujii, Y.; Kikuchi, H.; Chiba, M.; Yamamoto, Y.; Hori, H.; Petrakovskii, G. A.; Петраковский, Герман Антонович; Popov, M. A.; Bezmaternykh, L. N.
}
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14.
Boldyrev, K. N.
The electronic and magnetic structures of manganese doped
copper
metaborate Cu0.98Mn0.02B2O4 / K. N. Boldyrev, A. D. Molchanova, E. M. Moshkina> //
Moscow International Symposium on Magnetism (MISM-2017) : 1-7 July 2017 : book of abstracts. - 2017. - Ст. 4OR-O-11. - P. 752
РИНЦ
,
Материалы конференции
,
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Доп.точки доступа:
Molchanova, A. D.; Moshkina, E. M.; Мошкина, Евгения Михайловна; Болдырев, Кирилл Николаевич; Moscow International Symposium on Magnetism(7 ; 2017 ; Jul. ; Moscow); Московский государственный университет им. М.В. Ломоносова; Российский фонд фундаментальных исследований
Нет сведений об экземплярах (Источник в БД не найден)
}
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15.
Bolsunovskaya, O. A.
Interaction of two spin subsystems with different wavevectors / O. A. Bolsunovskaya, G. A. Petrakovskii, M. A. Popova> // Solid State Commun. - 2009. -
Vol. 149
,
Is. 1-2
. - P. 35-36,
DOI
10.1016/j.ssc.2008.10.019. - Cited References: 5 . - ISSN 0038-1098
РУБ
Physics, Condensed Matter
Рубрики:
COPPER
METABORATE
SOLITON LATTICE
CUB2O4
Кл.слова (ненормированные):
Magnetically ordered materials
--
Phase transitions
--
Magnetically ordered materials
--
Phase transitions
--
Spin dynamics
--
Magnetically ordered materials
--
Phase transitions
--
Field approximations
--
Spin systems
--
Sub systems
--
Phase transitions
Аннотация:
The possibility of the transition of a spin system from an incommensurable to a commensurable phase via a phase with different wavevectors of individual subsystems is shown in the mean-field approximation. (C) 2008 Elsevier Ltd. All rights reserved.
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Держатели документа:
[Bolsunovskaya, Olga A.
Petrakovskii, German A.
Popova, Mikhail A.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Popova, Mikhail A.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
L.V. Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Доп.точки доступа:
Petrakovskii, G. A.; Петраковский, Герман Антонович; Popova, M. A.
}
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16.
Borisov, A. A.
Temperature and concentration dependences of the electronic structure of
copper
oxides in the generalized tight binding method / A. A. Borisov, V. A. Gavrichkov, S. G. Ovchinnikov> // J. Exp. Theor. Phys. - 2003. -
Vol. 97
,
Is. 4
. - P. 773-780,
DOI
10.1134/1.1625067. - Cited References: 25 . - ISSN 1063-7761
РУБ
Physics, Multidisciplinary
Рубрики:
SUPERCONDUCTING-GAP ANISOTROPY
BAND-STRUCTURE
FERMI-SURFACE
NORMAL-STATE
BI2SR2CACU2O8+DELTA
EVOLUTION
Кл.слова (ненормированные):
Doping (additives)
--
Electron transitions
--
Electronic structure
--
Fermi level
--
Fermi surface
--
Electron correlations
--
Pseudogap
--
Tight binding method
--
Valence band
--
Copper
oxides
Аннотация:
The electronic structure of p-type doped HTSC cuprates is calculated by explicitly taking into account strong electron correlations. The smooth evolution of the electronic structure from undoped antiferromagnetic to optimally and heavily doped paramagnetic compositions is traced. For a low doping level, in-gap impurity-type states are obtained, at which the Fermi level is pinned in the low-doping region. These states are separated by a pseudogap from the valence band. The Fermi surfaces calculated for the paramagnetic phase for various concentrations of holes are in good agreement with the results of ARPES experiments and indicate a gradual change in the Fermi surface from the hole type to the electron type. (C) 2003 MAIK "Nauka/Interperiodica".
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Публикация на русском языке
Борисов, Алексей Александрович. Температурная и концентрационная зависимости электронной структуры оксидов меди в обобщенном методе сильной связи [Текст] / А. А. Борисов, В. А. Гавричков, С. Г. Овчинников // Журн. эксперим. и теор. физ. - 2003. - Т. 124 Вып. 4. - С. 862-870
Держатели документа:
Russian Acad Sci, Siberian Div, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Доп.точки доступа:
Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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17.
Chemistry of vinylidene
complexes. XXII. Synthesis and physicochemical properties of the binuclear vinylidene complex [Cp(CO)(2)ReCu(mu-C=CHPh)(mu-Cl)](2). Molecular structure of the new rheniumcopper complex / O. S. Chudin [et al.]> // J. Organomet. Chem. - 2014. -
Vol. 757
. - P. 57-61,
DOI
10.1016/j.jorganchem.2013.12.050. - Cited References: 19. - This work was financially supported by the Presidium of the Russian Academy of Sciences (Program for Basic Research, Project No. 8.15). . - ISSN 0022-328X. - ISSN 1872-8561
РУБ
Chemistry, Inorganic & Nuclear + Chemistry, Organic
Рубрики:
LIGANDS
Кл.слова (ненормированные):
Rhenium
--
Copper
--
Vinylidene complexes
--
Heterometallic complexes
--
X-ray structure
--
Cyclic voltammetry
Аннотация:
The interaction between Cp(CO)2ReCCHPh (1) and CuCl results in the new heterometallic μ-vinylidene complex [Cp(CO)2ReCu(μ2-CCHPh)(μ2-Cl)]2 (2) characterized earlier by IR and 1H, 13C NMR spectra. The molecular structure of compound 2 has been determined by X-ray diffraction analysis, revealing a dimer structure with two binuclear fragments linked to each other by asymmetric chloride bridges. The electrochemical behavior of 2 in acetonitrile was studied by cyclic voltammetry at a Pt-electrode.
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Держатели документа:
Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Krasnoyarsk 660036, Russia
Russian Acad Sci, Siberian Branch, Inst Phys, Krasnoyarsk 660036, Russia
RAS, Siberian Branch, Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia;КНЦ СО РАНИХХТ СО РАН;
Доп.точки доступа:
Chudin, O. S.; Verpekin, V. V.; Burmakina, G. V.; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Pavlenko, N. I.; Rubaylo, A. I.; Presidium of the Russian Academy of Sciences [8.15]
}
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18.
Chepkasov, I. V.
Analysis of thermal effects on
copper
nanoparticles synthesized from the gas phase / I. V. Chepkasov, Z. I. Popov> //
IOP Conf. Ser.: Mater. Sci. Eng. - 2015. -
Vol. 81
. - Ст. 012033,
DOI
10.1088/1757-899X/81/1/012033. - Cited References:14
Рубрики:
DEVICES
FILMS
Аннотация:
Molecular dynamics method using the tight-binding potential to carry out simulation of ultrafast heating of the synthesized particles from the gas phase to a temperature T= 600K and T= 900K, at which the particles were kept about 10 ns. As a result of the simulation revealed that the method of ultrafast heating the particles to high temperatures virtually eliminates the possibility of a clusters of defective education, but as a result of the heat treatment, the some of investigated particles can disconnect (burst) into smaller clusters.
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Доп.точки доступа:
Popov, Z. I.; Попов, Захар Иванович; International Scientific Conference on Radiation-Thermal Effects and Processes in Inorganic Materials (Nov 03-08, 2014 ; Tomsk, Russia); International scientific conference on radiation-thermal effects and processes in inorganic materials(2015)
}
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19.
Chiganova, G. A.
Nanodiamonds effect on characteristics of
copper
galvanic coatings / G. A. Chiganova, L. E. Tyryshkina, A. A. Ivanenko> // Russ. J. Appl. Chem. - 2013. -
Vol. 86
,
Is. 8
. - P. 1311-1313,
DOI
10.1134/S1070427213080260 . - ISSN 1070-4272
Аннотация:
The introduction of nanodiamonds (Technical Specification TU 3974-001-10172699-94) into a sulfuric acid electrolyte of
copper
plating was shown to result in decreased porosity and the corresponding diminishing of the electric resistance of the
copper
coatings. © Pleiades Publishing, Ltd., 2013.
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Публикация на русском языке
Чиганова, Г. А. Исследование влияния наноалмазов на характеристики медных гальванических покрытий / Г. А. Чиганова // Журнал прикладной химии. - 2013. - Т. 86, № 8. - С. 1337-1339. - ISSN 0044-4618
Держатели документа:
Siberian Fed Univ, Russian Acad Sci, Siberian Branch, Dept Phys Nanophase Mat,Krasnoyarsk Sci Ctr, Krasnoyarsk, Russia
Russian Acad Sci, Siberian Branch, Kirenskii Inst Phys, Krasnoyarsk, Russia
Доп.точки доступа:
Tyryshkina, L. E.; Ivanenko, A. A.; Иваненко, Александр Анатольевич
}
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20.
Coexisting 1D and
3D magnetic interactions in the insulating
copper
-oxygen compound CuB2O4 / M. . Boehm [et al.]> // Physica B. - 2006. -
Vol. 378-80
: International Conference on Strongly Correlated Electron Systems (SECES 05) (JUL 26-30, 2005, Vienna, AUSTRIA). - P. 1128-1129,
DOI
10.1016/j.physb.2006.01.540. - Cited References: 8 . - ISSN 0921-4526
РУБ
Physics, Condensed Matter
Рубрики:
SPIN-WAVE SPECTRUM
PHASE 10 K
METABORATE
Кл.слова (ненормированные):
cuprates
--
magnetic soliton lattice
--
Heisenberg exchange
--
low-dimensional excitations
--
Cuprates
--
Heisenberg exchange
--
Low-dimensional excitations
--
Magnetic soliton lattice
--
Dispersions
--
Insulating materials
--
Magnetic properties
--
Neutron scattering
--
Positive ions
--
Cuprates
--
Heisenberg exchange
--
Low-dimensional excitations
--
Magnetic soliton lattice
--
Copper
compounds
Аннотация:
We performed inelastic neutron scattering measurements on CuB2O4 with a magnetic field applied in the tetragonal basal plane. The spin dynamics in this cuprate is determined by the interplay of two magnetic Cu2+ subsystems, the magnetic cage with predominant 3d Heisenberg exchange and quasi Id zig-zag chains. The comparison of the dispersion spectra along the chain direction in zero field and under applied field suggests a decoupling of the two magnetic sublattices under field. (c) 2006 Elsevier B.V. All rights reserved.
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Держатели документа:
Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France
Paul Scherrer Inst, Neutron Scattering Lab, CH-5232 Villigen, Switzerland
Russian Acad Sci, Inst Phys, SB, Krasnoyarsk 660036, Russia
ИФ СО РАН
Institut Laue Langevin, 6, rue Jules Horowitz, F-38042 Cedex 9, France
Laboratory of Neutron Scattering, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
Institute of Physics, SB RAS, 660036 Krasnoyarsk, Russian Federation
Доп.точки доступа:
Boehm, M.; Roessli, B.; Schefer, J.; Ouladdiaf, B.; Kulda, J.; Petrakovskii, G. A.; Петраковский, Герман Антонович
}
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