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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Подопригора, Владимир Георгиевич, Раковская С. А.
Заглавие : Определение характеристик поверхности диэлектрических пластин с помощью рассеяния света
Место публикации : Международ. журн. прикл. и фундамент. исслед. - 2023. - № 6. - С. 59-62. - ISSN 19963955 (ISSN), DOI 10.17513/mjpfi.13554
Примечания : Библиогр.: 5
Аннотация: В работе предложен новый способ определения параметров шероховатостей и корреляционной функции (КФ) сверхгладких диэлектрических пластин. Способ основан на нахождении из экспериментальной индикатрисы рассеивания света коэффициентов разложения (КФ) в ряд по системе ортогональных функций с последующим вычислением среднеквадратичных отклонений высот неровностей поверхности σ и периода корреляции Т. Отличительными особенностями метода являются: 1) отсутствие неоднозначности, возникающей при подгонке к экспериментальной кривой рассеяния теоретических зависимостей с разными корреляционными функциями, которые сами зависят от параметров шероховатостей; 2) возможность избежать необходимости измерять индикатрису рассеяния во всей полусфере над образцом. Данный способ определения КФ и параметров шероховатости поверхности может применяться для любого типа границ раздела при соблюдении критерия Рэлея, определяющего степень неровности поверхности отражения по отношению к длине волны падающего излучения. Поэтому объектами исследования могут быть не только поверхности с нанометровыми шероховатостями, облучаемые лазерным светом, но и, например, земные покровы при их дистанционном зондировании радиосигналами навигационных спутников. Для полированных пластин кварца получены значения параметров поверхностей, близкие к аналогичным величинам, измеренным независимо на лазерном интерференционном профилометре другими авторами.The paper proposes a new method for determining the roughness parameters and the correlation function (CF) of supersmooth dielectric plates. The method is based on finding the expansion coefficients (CF) from the experimental light scattering indicatrix in a series according to a system of orthogonal functions, followed by the calculation of the standard deviations of the surface irregularity heights σ and the correlation period Т. Distinctive features of the method are: 1) the absence of ambiguity that arises when fitting theoretical dependences with different correlation functions, which themselves depend on the roughness parameters, to the experimental scattering curve; 2) the possibility of avoiding the need to measure the scattering indicatrix in the entire hemisphere above the sample. This method for determining the CF and surface roughness parameters can be used for any type of interface, subject to the Rayleigh criterion, which determines the degree of roughness of the reflection surface with respect to the wavelength of the incident radiation. Therefore, the objects of study can be not only surfaces with nanometer roughness irradiated by laser light, but also, for example, earth covers during their remote sensing by radio signals from navigation satellites. For polished quartz plates, the values of the surface parameters were obtained close to similar values measured independently on a laser interference profilometer by other authors.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Шайдуров, Александр Алексеевич, Акатов, Андрей Владиславович, Щербинин, Всеволод Владиславович, Хорев, Николай Германович, Момот, Андрей Павлович, Неймарк, Михаил Израилевич, Беллер, Александр Викторович
Заглавие : Определение статистически значимых факторов эмболии при тромбозе вен нижних конечностей
Место публикации : Известия АлтГУ. - 2015. - Т. 2, Вып. 1. - С. 169-174. - ISSN 1561-9443, DOI 10.14258/izvasu(2015)1.2-31
Примечания : Библиогр.: 6
Ключевые слова (''Своб.индексиров.''): статистические методы анализа данных--корреляционный анализ--дискриминантный анализ--тромбоз системы нижней полой вены--тромбоэмболия легочной артерии--statistical methods of data analysis--correlation analysis--discriminant analysis--thrombosis of the inferior vena cava--pulmonary embolism
Аннотация: Рассматривается возможность оценки факторов эмболизации при тромбозе системы нижней полой вены. В качестве инструментария используются статистические однопараметрические и многопараметрические методы анализа данных. Несмотря на то, что современная терапия позволяет предупредить возникновение тромботического события, ее проведение сопряжено с опасностью развития кровотечений. Хирургическое лечение тромбоза вен нижних конечностей также является сложным по технике выполнения оперативным вмешательством, с далеко не однозначными показаниями и противопоказаниями. Предполагается, что у больных имеются предрасполагающие факторы к возникновению этого осложнения. В силу этого выявление факторов, способствующих возникновению эмбологенности, явилось целью нашего исследования. Для выявления факторозависимо-сти тромбоэмболии легочной артерии и показателей конституции, возраста, пола, анализов венозной крови, гемостаза и сопутствующей патологии в случайной выборке был проведен корреляционный анализ. Для установления возможных комбинаций параметров, оказывающих влияние на наличие тромбоэмболии легочной артерии, осуществлен дискриминантный анализ данных.In the paper, the identifiability of embolization factors due to thrombosis of inferior vena cava using one-parameter and multi-parameter statistical methods is investigated. Despite the fact that modern therapy can prevent the occurrence of thrombotic events, its delivery entails a hemorrhage risk. Surgical treatment of lower limbs venous thrombosis is complicated due to the technique of surgical intervention with indications and contraindications being far from unambiguous. It is assumed that patients have predisposing factors to such complications. Therefore, the goal of the study is to identify the embologenic factors. To reveal the dependencies between pulmonary embolism and bodily constitution, age, sex, test results of venous blood, hemostasis, and comorbidity, a correlation analysis has been conducted in a random sample. Further, a discriminant analysis has been performed for identification of the potential combination of parameters that characterize the pulmonary embolism.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Якубайлик, Эдуард Константинович, Балаев, Александр Дмитриевич, Ганженко, Игорь Михайлович, Бутов, Павел Юрьевич
Заглавие : Корреляция магнитных свойств и содержания железа в продуктах мокрой магнитной сепарации
Место публикации : Изв. вузов. Черн. металлургия: Нац. исслед. технол. ун-т "МИСиС", 2015. - Т. 58, № 10. - С. 744-748. - ISSN 0368-0797, DOI 10.17073/0368-0797-2015-10-744-748
Примечания : Библиогр.: 10
Ключевые слова (''Своб.индексиров.''): мокрая сепарация--слив--концентрат--удельная намагниченность насыщения--удельная магнитная восприимчивость--wet separation--discharge--concentrate--specific saturation magnetization--specific magnetic susceptibility
Аннотация: Изучено изменение одного из основных параметров мокрого магнитного обогащения - содержания железа - и магнитных характеристик продуктов по технологической схеме обогащения Абагурской обогатительной фабрики (от слива классификаторов до концентрата 2-й стадии). Количество железа в пробах заметно растет с уменьшением крупности частиц. Приращение содержания железа магнетитового по схеме составляет 27,43 %, удельная намагниченности насыщения σ возрастает на 25,8 А·м2/кг; в поле сепарации Н = 175 кА/м прирост удельной намагниченности насыщения аналогичен - 25,76 А·м2/кг. Значения удельной магнитной восприимчивости χ в концентрате в сравнении со сливом выше. С ростом напряженности поля сепарации удельная восприимчивость продуктов уменьшается в несколько раз. По всей схеме обогащения наблюдается пропорциональность значений содержания железа и магнитных параметров продуктов. Учитывая эту закономерность, магнитные характеристики продуктов можно использовать для контроля и регулирования технологических режимов процессов мокрого магнитного обогащения.The change of one of the main parameters of wet magnetic concentration – the iron content and magnetic characteristics of products made by the concentration technological scheme of Abagur Enrichment Plant (from classifi er discharge to concentrate of the 2nd stage) has been studied. The iron content in the samples is growing signifi - cantly with the decrease of the particle coarseness. The increment of iron magnetite by the scheme is 27.43 %, the specifi c value of saturation magnetization σs increases by 25.8 A·m2/kg. The growth of specifi c magnetization in the separation fi eld H = 175 kA/m is similar – 25.76 A·m2/kg. The values of specifi c magnetic susceptibility χ in the concentrate are higher in comparison with the discharge. The specifi c product susceptibility decreases in several times with the growth of separation fi eld strength. Throughout the concentration scheme the quantity proportionality of iron content and magnetic parameters of products is observed. Taking into an account all the regularities, magnetic characteristics of the products can be used to control and regulate the process of technological modes of wet magnetic separation processes.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Avramov P. V., Ovchinnikov S. G.
Заглавие : The strong electron correlation effects in XAFS spectra of HTSC cuprates
Место публикации : J. Phys. IV. - 1997. - Vol. 7: 9th International Conference on X-Ray Absorption Fine Structure (AUG 26-30, 1996, GRENOBLE, FRANCE), Is. C2. - P.183-185. - ISSN 1155-4339
Примечания : Cited References: 11
Предметные рубрики: X-RAY-ABSORPTION
MULTIPLE-SCATTERING ANALYSIS
EDGE STRUCTURE
LA2CUO4
XANES
Аннотация: Theoretical XAFS spectra of highly correlated copper oxides have been presented as a product of a single-electron part obtained by the SCF X alpha- SW method, and a multi-electron part obtained by the multi-band multi-electron p-d model. The main line of CuK-spectrum of La2CuO4 was aligned to the Cud(10) (L) under bar configuration and the single satellite line was aligned to the Cud(9). Comparison of the theoretical data with the experimental ones shows that the ground state of the two-holes in the CuO4 doped cell is triplet. The last conclusion has been confirmed by analysis of CuL2,3-spectra of two-hole impurity states of doped CuO4 cell. Another interesting future of CuL2,3-spectra a peak 2.8 eV higher the threshold was aligned to the transitions into quasi-stationary states due to existence of a high barrier in the Cud-state potential.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavrichkov V. A., Ovchinnikov S. G., Yakimov L. E.
Заглавие : The role of orbital ordering in the formation of electron structure in undoped LaMnO3 manganites in the regime of strong electron correlations
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2006. - Vol. 102, Is. 6. - P972-985. - ISSN 1063-7761, DOI 10.1134/S1063776106060112
Примечания : Cited References: 25
Предметные рубрики: COLOSSAL MAGNETORESISTIVE OXIDES
DOUBLE EXCHANGE
BAND
MODEL
Ключевые слова (''Своб.индексиров.''): computational methods--correlation methods--doping (additives)--electrons--ferromagnetic materials--lanthanum compounds--paramagnetic materials--intraatomic electron correlations--mott hubbard correlation gap--orbital ordering--paramagnetic phases--electronic structure
Аннотация: The electron structure of undoped LaMnO3 and slightly doped La1-xSrxMnO3 manganites has been calculated within the framework of a generalized tight binding method with explicit allowance for strong intra-atomic electron correlations. According to the results of these calculations, the ground state in orbitally disordered undoped LaMnO3 ferromagnets would be metallic despite the Mott-Hubbard correlation gap in the spectrum of quasiparticles. Owing to the orbital ordering, the insulating state is stabilized in both antiferromagnetic and paramagnetic phases. In-gap states of a polaron nature with a spectral weight proportional to the dopant concentration have been found near the top of the valence band in La1-xSrxMnO3. As the doping level increases, a metal state appears in the ferromagnetic phase, which has a metallic character for one spin subband and an insulating character for the other subband (representing the so-called half-metallic state).
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ovchinnikov S. G.
Заглавие : The mechanism of the electronic transition in ferroborates under high pressure
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2005. - Vol. 17: 2nd International Symposium on Physics of Solids Under High Pressure Using Nuclear Probes (JUL 20-24, 2004, Cologne, GERMANY), Is. 11. - P.S743-S751. - ISSN 0953-8984, DOI 10.1088/0953-8984/17/11/003
Примечания : Cited References: 20
Предметные рубрики: STRUCTURAL PHASE-TRANSITION
MAGNETIC COLLAPSE
OPTICAL-SPECTRA
BAND-STRUCTURE
FEBO3
MODEL
Ключевые слова (''Своб.индексиров.''): carrier concentration--correlation methods--electron transitions--high pressure effects--magnetic moments--mathematical models--metal insulator transition--crystal field--electron correlations--electronic transition--ferroborates--ferromagnetic materials
Аннотация: A novel mechanism for the insulator-semiconductor transition and magnetic collapse in FeBO3 is proposed in the framework of the multielectron model with account taken of strong electron correlations. The electronic transition results from the crossover of the high spin and low spin Fe3+ states induced by the crystal field increasing with pressure. In the high pressure phase a semiconductor-metal transition is expected.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : OVCHINNIKOV S.G.
Заглавие : THE INFLUENCE OF THE ANTIFERROMAGNETISM ON THE ELECTRONIC-STRUCTURE OF LA2CUO4
Разночтения заглавия :авие SCOPUS: The influence of the antiferromagnetism on the electronic structure of La2CuO4
Место публикации : J. Supercond.: PLENUM PUBL CORP, 1995. - Vol. 8: University-of-Miami Workshop on High-Temperature Superconductivity - Physical Properties and Mechanisms (JAN 05-11, 1995, CORAL GABLES, FL), Is. 5. - P675-676. - ISSN 0896-1107, DOI 10.1007/BF00727473
Примечания : Cited References: 15
Предметные рубрики: OXIDES
MODEL
Ключевые слова (''Своб.индексиров.''): 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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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zobov V. E., Kucherov M. M.
Заглавие : The high-frequency asymptotes of the spin correlation function for a dilute Heisenberg paramagnet
Коллективы : "Euromar", International Conference
Место публикации : Euromar. Denmark 2016: book of abstracts. - 2016. - P.381
Примечания : References: 5
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Korshunov M. M., Zakharova E. V., Nekrasov I. A., Pchelkina Z. V., Ovchinnikov S. G.
Заглавие : The Fermi surface and the role of electronic correlations in Sm2-xCexCuO4
Коллективы :
Разночтения заглавия :авие SCOPUS: The Fermi surface and the role of electronic correlations in Sm 2-xCexCuO4
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2010. - Vol. 22, Is. 1. - Ст.15701. - ISSN 0953-8984, DOI 10.1088/0953-8984/22/1/015701
Примечания : Cited References: 35. - We would like to thank A A Kordyuk and I Eremin for useful discussions. The authors acknowledge support from RFBR (grants 08-02-00021, 10-02-00662, 08-02-91200 and 07-02-00226), the RAS programs on 'Low temperature quantum phenomena', 'Quantum physics of condensed matter' and 'Strongly correlated electrons solids', President of Russia (grants MK-614.2009.2 (IN) and MK-3227.2008.2 (ZP)), Scientific School (grant SS-1929.2008.2), Interdisciplinary UB-SB RAS project, Dynasty Foundation (ZP) and Russian Science Support Foundation (IN).
Предметные рубрики: T-C SUPERCONDUCTOR
IN-GAP STATES
SPIN CORRELATIONS
BAND
LA2-XSRXCUO4
EXCITATIONS
TRANSITION
EVOLUTION
SM2CUO4
OXIDES
Ключевые слова (''Своб.индексиров.''): antiferromagnetics--doping evolution--electron-doped--electronic correlation--emery model--experimental data--generalized tight bindings--high-t--hybrid scheme--magnetic orders--spin-liquid--tight binding model--two-regime--antiferromagnetism--cerium--cerium compounds--copper oxides--corundum--doping (additives)--fermi surface--fermions--tin--surfaces
Аннотация: Using a LDA + GTB (local density approximation + generalized tight-binding) hybrid scheme we investigate the band structure of the electron-doped high-T-c material Sm2-xCexCuO4. Parameters of the minimal tight-binding model for this system (the so-called three-band Emery model) were obtained within the NMTO (Nth-order muffin-tin orbital) method. The doping evolution of the dispersion and the Fermi surface in the presence of electronic correlations was investigated in two regimes of magnetic order: short-range (spin-liquid) and long-range (antiferromagnetic metal). Each regime is characterized by the specific topologies of the Fermi surfaces and we discuss their relation to recent experimental data.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Shklyaev A. A., Barabanov A. F.
Заглавие : The effect of spin correlations on a superconducting phase of the spin polarons in 2D Kondo lattice
Место публикации : J. Phys. Conf. Ser. - 2010. - Vol. 200, Is. SECTION 1. - ISSN 17426588 (ISSN), DOI 10.1088/1742-6596/200/1/012217
Ключевые слова (''Своб.индексиров.''): antiferromagnets--concentration dependence--cuprates--experimental data--hopping integrals--kondo lattice model--kondo lattices--magnetic correlation--spin correlations--spin polaron--superconducting phase--superconducting phase transitions--temperature dependence--copper compounds--correlators--magnetism--phase diagrams--polarons--superconducting magnets--superconductivity--phase transitions
Аннотация: The effect of the magnetic correlators on the spin polaron superconducting phase is studied in terms of 2D Kondo lattice model. It is shown that hopping integrals are renormalized by the magnetic correlators and as a result the Tc phase diagram is changing significantly. By computation the effect of magnetic correlation functions on the concentration dependence of T c was analysed and their substantial role in description of doped antiferromagnets is demonstrated. The obtained phase diagram is in qualitative agreement with experimental data for temperature dependence of the superconducting phase transition with d-type symmetry in cuprates. © 2010 IOP Publishing Ltd.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ignatchenko V. A., Mankov Yu. I.
Заглавие : The effect of correlation-properties of inhomogeneities on plasma excitations in a metal
Разночтения заглавия :авие SCOPUS: The effect of correlation properties of inhomogeneities on plasma excitations in a metal
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 1991. - Vol. 3, Is. 31. - P.5837-5845. - ISSN 0953-8984, DOI 10.1088/0953-8984/3/31/007
Примечания : Cited References: 21
Предметные рубрики: SPIN-WAVES
ANISOTROPY
Аннотация: We theoretically investigate the manifestations of the non-monotonic character and anisotropic peculiarities of the correlation functions of the inhomogeneities in the dispersion law and damping of plasma waves. The following specific effects have been found: a change in the character of the modifications, dispersion law and damping for small wavenumbers; dependence of the plasma frequency shift on the direction of the wave propagation. We substantiate possibilities for developing the correlation spectroscopy of plasma waves which would enable us not only to measure a correlation radius of the inhomogeneities (this has been suggested earlier), but also to obtain information in the form of the correlation function.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zobov V. E., Popov M. A.
Заглавие : The coordinate of a singular point of the time correlation functions for a heteronuclear spin system of a crystal
Место публикации : J. Exp. Theor. Phys.: AMER INST PHYSICS, 2005. - Vol. 100, Is. 4. - P775-783. - ISSN 1063-7761, DOI 10.1134/1.1926438
Примечания : Cited References: 24
Предметные рубрики: FLUCTUATION SPECTRUM
CROSS-RELAXATION
NMR ABSORPTION
SHAPE
WINGS
LINE
Ключевые слова (''Своб.индексиров.''): correlation methods--crystal lattices--crystallography--functions--integral equations--lithium compounds--nuclear magnetic resonance--quantum theory--random processes--autocorrelation functions (acf)--dipole-dipole interactions (ddi)--heteronuclear spin systems--self-consistent fluctuating field (scff)--crystals
Аннотация: The singularities of the time autocorrelation functions (ACFs) for a heteronuclear spin system of a crystal are investigated. Exact expressions are obtained for ten moments of the spectra of ACFs in the approximation of a self-consistent fluctuating field (SCFF) with arbitrary axial symmetry. These expressions are applied to determine the coordinate of the lowest singular point of these functions on the imaginary-time axis for a spin system with a dipole-dipole interaction (DDI). The leading corrections to this coordinate due to the correlation of local fields in real crystals are calculated. These corrections are determined by lattice sums with triangles of four bonds and pairs of four bonds. Numerical values of the coordinate are obtained for a LiF crystal in a magnetic field directed along three crystallographic axes. An increase in the coordinate of the singular point, which follows from the theory and leads to a faster falloff of the wings of the ACF spectra, qualitatively agrees with experiment. © 2005 Pleiades Publishing, Inc.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavrichkov V. A., Ovchinnikov S. G.
Заглавие : The band structure of n-type cuprate superconductors with the T '(T) structure taking into account strong electron correlation
Разночтения заглавия :авие SCOPUS: The band structure of n-type cuprate superconductors with the T′(T) structure taking into account strong electron correlation
Место публикации : J. Exp. Theor. Phys.: AMER INST PHYSICS, 2004. - Vol. 98, Is. 3. - P556-564. - ISSN 1063-7761, DOI 10.1134/1.1705708
Примечания : Cited References: 18. - This work was financially supported by the Russian Foundation for Basic Research (project no. 03-02-16124), RFFI-KKFN “Eniseœ” (project no. 02-02-97705), INTAS (project no. 01-0654), integration program of URO and Siberian Division, Russian Academy of Sciences
Предметные рубрики: QUASI-PARTICLES
COPPER OXIDES
TEMPERATURE
LA2-XSRXCUO4
ND2-XCEXCUO4
EVOLUTION
MOMENTS
Ключевые слова (''Своб.индексиров.''): dielectric properties--electric conductance--electron transitions--electronic structure--fermi level--phase diagrams--semiconductor doping--conduction bands--electron correlation--spectral density--superconducting materials
Аннотация: The spectral density, dispersion relations, and the position of the Fermi level for n-doped compositions based on NCO and LCO were calculated within the framework of the generalized tight binding method. As distinguished from LCO, the dielectric gap in NCO is nonlinear in character. We observe a virtual level both at the bottom of the conduction band and at the top of the valence band in both compounds. However, its position corresponds to the extreme bottom of the conduction band in LCO and is 0.1 - 0.2 eV above the bottom in NCO. This explains why we observe Fermi level pinning in n-LCO as the concentration of the doping component grows and reproduce its absence in NCCO at low doping values. We also found both compositions to be unstable in a narrow concentration range with respect to a nonuniform charge density distribution. The relation between the phase diagram for NCCO and the calculated electronic structure is discussed. (C) 2004 MAIK "Nauka/Interperiodica".
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Il'in N. V., Komogortsev S. V., Krainova G. S., Ivanov V. A., Tkachenko I. A., Tkachev V. V., Plotnikov V. S., Iskhakov R. S.
Заглавие : Studying the temperature dependence of the intensity of magnetization of rapidly quenched Fe–Cu–Nb–Si–B alloys
Место публикации : Bull. Russ. Acad. Sci. Phys. - 2021. - Vol. 85, Is. 9. - P.945-949. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873821090148
Примечания : Cited References: 11. - This work was supported by support of the Russian Foundation for Basic Research, project no. 19-32-90182; and as part of a State Task from the Ministry of Science and Higher Education, project No. 0657-2020-0005
Аннотация: A study is performed of rapidly quenched alloys of the Finemet type with different compositions. The Curie temperature, Bloch constant, critical exponent, and spontaneous magnetization at 0 K are calculated by analyzing the low- and high-temperature dependences of magnetization. A linear correlation is found between the constant of spin-wave stiffness and the Curie temperature.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Iskhakov R. S., Ignatchenko V. A., Komogortsev S. V., Balaev A. D.
Заглавие : Study of magnetic correlations in nanostructured ferromagnets by correlation magnetometry
Место публикации : JETP Letters. - 2003. - Vol. 78, Is. 10. - P.646-650. - ISSN 0021-3640, DOI 10.1134/1.1644310
Примечания : Cited References: 20
Предметные рубрики: AMORPHOUS FERROMAGNETS
RANDOM ANISOTROPY
NANOCRYSTALLINE
SYSTEM
RIPPLE
Аннотация: We propose a theoretically justified experimental magnetometric technique for determining the size of stochastic domains spontaneously formed in the spin system of nanostructured ferromagnets and for evaluating the effective anisotropy in these magnetically correlated regions. The method is based on monitoring the DeltaM similar to H (-2) relationship in the low-field part of the integral magnetization curve. (C) 2003 MAIK "Nauka/Interperiodica".
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Maksimov D. N., Sadreev A. F.
Заглавие : Statistics of nodal points of in-plane random waves in elastic media
Место публикации : Phys. Rev. E: AMER PHYSICAL SOC, 2008. - Vol. 77, Is. 5. - Ст.56204. - ISSN 1539-3755, DOI 10.1103/PhysRevE.77.056204
Примечания : Cited References: 39
Предметные рубрики: PHASE SINGULARITIES
SPECTRAL STATISTICS
FIELDS
BILLIARDS
PATTERNS
Ключевые слова (''Своб.индексиров.''): chaotic systems--correlation methods--navier stokes equations--random processes--statistics--elastic media--in-plane random waves--navier-cauchy equations--nodal points (np)--electromagnetic waves
Аннотация: We consider the nodal points (NPs) u=0 and v=0 of the in-plane vectorial displacements u=(u,v) which obey the Navier-Cauchy equation. Similar to the Berry conjecture of quantum chaos, we present the in-plane eigenstates of chaotic billiards as the real part of the superposition of longitudinal and transverse plane waves with random phases. By an average over random phases we derive the mean density and correlation function of NPs. Consequently we consider the distribution of the nearest distances between NPs.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S.
Заглавие : Static and dynamic magnetic properties of coupled spin-1/2 antiferromagnetic chains
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2000. - Vol. 12, Is. 37. - P.8191-8207. - ISSN 0953-8984, DOI 10.1088/0953-8984/12/37/316
Примечания : Cited References: 21
Предметные рубрики: ONE-DIMENSIONAL ANTIFERROMAGNETS
SYSTEMS
SUSCEPTIBILITY
EXCITATIONS
SR2CUO3
CA2CUO3
KCUF3
Ключевые слова (''Своб.индексиров.''): 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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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Korovushkin M. M.
Заглавие : Splitting of the lower subband of Hubbard fermions in the Shubin-Vonsowsky model under the influence of strong intersite correlations
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 112, Is. 1. - P108-120. - ISSN 1063-7761, DOI 10.1134/S1063776110061056
Примечания : Cited References: 26. - We express our deep gratitude to R. O. Zaitsev for numerous remarks and discussions. We are grateful to A. A. Golovnya, A. A. Shklyaev, and V. A. Mitskan for specific advice on the numerical calculations of the mass operator. This work was supported by the "Quantum Condensed Matter Physics" Program of the Presidium of the Russian Academy of Sciences, the Russian Foundation for Basic Research (project no. 10-02-00251), the "Scientific and Scientific-Pedagogical Personnel of Innovational Russian for 2009-2013" Federal Goal-Oriented Program, and the Interdisciplinary Integration Project no. 53 of the Siberian Branch of the Russian Academy of Sciences. One of us (M. K.) thanks Lavrentiev's contest of youth projects of the Siberian Branch of the Russian Academy of Sciences.
Предметные рубрики: NARROW ENERGY BANDS
ELECTRON CORRELATIONS
Ключевые слова (''Своб.индексиров.''): cooper channels--cooper instability--density of electronic state--doping levels--electron concentration--energy structures--hubbard--hubbard operators--interaction energies--intersite correlation--mott-hubbard insulator--nonuniform--renormalization--root mean squares--scattering amplitudes--spectral intensity--split-off band--strongly correlated fermions--sub-bands--doping (additives)--superconducting transition temperature
Аннотация: The diagram technique for Hubbard operators is used to investigate the influence of intersite Coulomb interactions on the energy structure and Cooper instability of strongly correlated fermions. Allowance for intersite correlations in doped Mott-Hubbard insulators is shown to lead to a splitting of the lower subband of Hubbard fermions and to the formation of a band of fluctuation states as soon as the intersite interaction energy becomes comparable to or exceeds the mean kinetic energy. The spectral intensity of the splitoff band is proportional to the root-mean-square fluctuation of the occupation numbers and increases with doping level. The predicted effect changes significantly the structure of the density of electronic states. This leads to a renormalization of the pole of the scattering amplitude in the Cooper channel and manifests itself as a nonuniform (in electron concentration) modification of the dependence of the critical superconducting transition temperature.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zlotnikov A. O., Aksenov S. V., Shustin M. S.
Заглавие : Spin-orbit coupling-induced effective interactions in superconducting nanowires in the strong correlation regime
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-02-00348, 20-3270059]; Krasnoyarsk Territorial Foundation [19-42-240011, 18-42240014]; Government of the Krasnoyarsk Territory; Presidium of the Russian Academy of SciencesRussian Academy of Sciences [I.12]; Council for Grants of the President of the Russian Federation [MK-1641.2020.2]
Место публикации : Phys. Solid State. - 2020. - Vol. 62, Is. 9. - P.1612-1618. - ISSN 1063-7834, DOI 10.1134/S1063783420090371. - ISSN 1090-6460(eISSN)
Примечания : Cited References: 24. - This study was supported by the Russian Foundation for Basic Research, projects nos. 19-02-00348 and 20-3270059, the Government of the Krasnoyarsk Territory and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activity, projects nos. 19-42-240011 and 18-42240014 "Single-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 the Presidium of the Russian Academy of Sciences, program I.12 "Fundamental Problems of High-Temperature Superconductivity." S.V.A. thanks the Council for Grants of the President of the Russian Federation for Governmental Support of Young Russian Scientists, project no. MK-1641.2020.2
Аннотация: In the second order of the operator form of the perturbation theory, the effective interactions in a superconducting nanowire have been obtained at the strong electron correlations, when the spin-orbit coupling parameter is comparable with the hopping integral. Using the exact diagonalization technique, in short nanowires with the open boundary conditions at the strong Coulomb repulsion, the excitations corresponding to the Majorana edge states with the energy below the value of a bulk superconducting gap have been demonstrated.
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20.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ignatchenko V. A., Pozdnyakov A. V.
Заглавие : Spectral properties of superlattices with anisotropic inhomogeneities. The transition from 3D to 2D disorder
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Diffusion and Defect Data Pt.B: Solid State Phenomena. - 2012. - Vol. 190. - P.597-600. - ISBN 1012-0394, DOI 10.4028/www.scientific.net/SSP.190.597. - ISBN 9783037854365
Ключевые слова (''Своб.индексиров.''): anisotropic inhomogeneities--dos--green function--superlattice--susceptibility--waves--anisotropic inhomogeneities--continuous transitions--correlation properties--density of state--dynamic susceptibility--inhomogeneities--spectral properties--wave numbers--dos--green's function--magnetic materials--magnetic susceptibility--superlattices--three dimensional--waves--anisotropy
Аннотация: Waves in superlattice (SL) contained inhomogeneities with anisotropic correlation properties are considered. The anisotropy of the correlation during the transition from 3D to 2D disorder is characterized by the parameter ? 1 = k ||/k?-1, where k || and k? are the correlation wave numbers along the axis of the SL and in the plane of the its layers, respectively (r || =k || -1 and r?=k?-1 are the correlation radii). Dependencies of both the dynamic susceptibility and density of states at the continuous transition from the isotropic three-dimensional inhomogeneities (? 1 = 0) to the twodimensional ones (? 1 = -1) have been obtained. В© (2012) Trans Tech Publications.
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