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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Вальков, Валерий Владимирович, Аксенов, Сергей Владимирович, Уланов Е. А.
Заглавие : Эффект Фано при туннелировании спин-поляризованного электрона через одиночную магнитную примесь
Место публикации : Физ. низких температур. - 2013. - Т. 39, Вып. 1. - С. 48-52
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Беляев, Борис Афанасьевич, Волошин, Александр Сергеевич, Шабанов, Василий Филиппович
Заглавие : Исследование добротности резонанса примесной моды в микрополосковой модели одномерного фотонного кристалла
Место публикации : Доклады Академии наук. - 2005. - Т. 403, № 3. - С. 319-324. - ISSN 0869-5652
РИНЦ
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Rudenko V. V., Vorotynov A. M.
Заглавие : Weak ferromagnetism along the third-order axis of the FeBO3 crystals caused by Fe2+ impurity ions
Место публикации : J. Magn. Magn. Mater. - 2018. - Vol. 454. - P.139-143. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2018.01.037
Примечания : Cited References: 22
Ключевые слова (''Своб.индексиров.''): week ferromagnetism--magnetic anisotropy--impurity
Аннотация: Using the single-ion approximation, the weak ferromagnetic moment σZ(Fe2+) along the third-order axis of FeBO3 crystals, which is caused by the contribution of Fe2+ ions, has been investigated in the framework of the model Fe2+ impurity ion – vacancy. The extreme low-temperature behavior of the total magnetic moment due to the strong dependence of the Fe2+ion contribution is predicted.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Korshunov M. M., Togushova Yu. N., Dolgov O. V.
Заглавие : Uniform impurity scattering in two-band s ± and s ++ superconductors
Коллективы : RFBR [16-02-00098]; Leading Scientific Schools of the Russian Federation [NSh-2886.2014.2]
Место публикации : J. Supercond. Nov. Magn.: Springer, 2016. - Vol. 29, Is. 4. - С. 1089-1095. - ISSN 1557-1939, DOI 10.1007/s10948-016-3385-6. - ISSN 1557-1947(eISSN)
Примечания : Cited References:28. - We are grateful to D.V. Efremov and A. A. Golubov for useful discussions. We acknowledge the partial support by RFBR (Grant 16-02-00098) and President Grant for Government Support of the Leading Scientific Schools of the Russian Federation (NSh-2886.2014.2).
Предметные рубрики: High-temperature superconductivity
Iron
Ключевые слова (''Своб.индексиров.''): multiband superconductivity--impurity scattering--fe-based--superconductors
Аннотация: The s ± and s ++ models for the superconducting state are subject of intense studies regarding Fe-based superconductors. Depending on the parameters, disorder may leave intact or suppress T c in these models. Here, we study the special case of disorder with equal values of intra- and interband impurity potentials in the two-band s ± and s ++ models. We show that this case can be considered as an isolated point and T c there has maximal damping for a wide range of parameters.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vorotynov A. M., Ovchinnikov S. G., Rudenko V. V.
Заглавие : Uniaxial and basal plane anisotropy caused by Cr2+ impurity ions in CrBO3 crystals
Место публикации : J. Phys. Chem. Solids. - 2018. - Vol. 123. - P.389-392. - ISSN 00223697 (ISSN), DOI 10.1016/j.jpcs.2018.08.016
Примечания : Cited References: 14
Ключевые слова (''Своб.индексиров.''): anisotropy--chromium compounds--crystal impurities--ions--single crystals
Аннотация: IIn this study, the uniaxial and basal anisotropy governed by Cr2+ impurity ions was treated based on the Cr2+– BO3 3− ion vacancy model using single ion approximation. The anomalous behavior of the basal anisotropy at low temperatures was predicted.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Boldyrev K. N., Popova M. N., Bezmaternykh L. N., Gudim, I. A.
Заглавие : Uncontrolled impurity of Bi3+ in rare-earth iron borates RFe3(BO3)4
Коллективы : International Conference on the Physics of Optical Materials and Devices
Место публикации : The 4th International Conference on the Physics of Optical Materials and Devices. ICOM 2015: book of abstracts. - 2015. - P.262. - ISBN 978-86-7306-134-4
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Onufrienok V. V., Chzhan A. V., Bondarenko G. V., Yurkin G. Yu.
Заглавие : Transition of metastable pyrrhotites to a stable phase state
Место публикации : Inorg. Mater. - 2020. - Vol. 56, Is. 9. - P.898-902. - ISSN 0020-1685, DOI 10.1134/S0020168520090137. - ISSN 1608-3172(eISSN)
Примечания : Cited References: 23
Предметные рубрики: MAGNETIC-PROPERTIES
TEMPERATURE
CHEMISTRY
Аннотация: Equilibrium phase relations of synthetic minerals prepared by annealing metastable iron sulfides, followed by prolonged isothermal storage in the Earth atmosphere, have been studied by X-ray diffraction. The results demonstrate that prolonged storage of synthetic pyrrhotites annealed at different temperatures makes it possible to identify metastable and stable phases of Fe and S compounds.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Erukhinov M. S.
Заглавие : The S-D(f)-hybridization effect on light-absorption in impurity magnetic semiconductors
Место публикации : Fiz. Tverd. Tela. - 1980. - Vol. 22, Is. 6. - P.1660-1665. - ISSN 0367-3294
Примечания : Cited References: 12
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavrichkov V. A., GAVRICHKOV S. A.
Заглавие : The jahn-teller instability criterion for resonance impurity states
Место публикации : Phys. Lett. A. - 1990. - Vol. 145, Is. 6-7. - P.353-357. - ISSN 0375-9601, DOI 10.1016/0375-9601(90)90948-N
Примечания : Cited References: 13
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bondarenko G. V., Ovchinnikov S. G., Rudenko V. V., Sosnin V. M., Tugarinov V. I., Vorotynov A. M.
Заглавие : The generalized method of quantitative description of the uniaxial anisotropy in weak ferromagnet rhombohedral calcite type structure crystals with S-state ions
Место публикации : J. Magn. Magn. Mater. - 2013. - Vol. 335. - P.90-96. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2013.01.037
Примечания : Cited References: 35
Ключевые слова (''Своб.индексиров.''): weak ferromagnetism--magnetic anisotropy--impurity
Аннотация: The method for investigation of the uniaxial and hexagonal anisotropies in weakly ferromagnetic rhombohedral FeBO3 crystals with the Fe2þ magnetic impurity with the use of the single-ion and pair approximation has been developed. In the framework of this method, a quantitative discrepancy between theoretical and experimental data on a uniaxial ﬁeld has been eliminated. The energy contributions to the hexagonal anisotropy that are caused by the Dzyaloshinsky–Moriya interaction, the crystal ﬁeld of Fe3þ ions and the temperature dependence of this anisotropy were analytically treated. The experimental temperature dependence of the hexagonal anisotropy of FeBO3 crystals is explained. It is shown that the compensation point and the typical temperature dependence of the hexagonal anisotropy result from the competition of the contributions of Fe3þ and Fe2þ ions. It is shown that respective considerable contributions to the anisotropy of Fe3þ and Fe2þ ions are made by the cubic symmetry and the uniaxial symmetry of the exchange ‘‘single-ion’’ type. The anisotropy constants for FeBO3 crystal was obtained by using the described results. It was shown, that for the calcite type structure crystals (iron borate and manganese carbonate) with S-state ions, the single ion and pair models (which previously raised doubts in their validity and accuracy) describe the experimental data good enough.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shestakov V. A., Korshunov M. M., Dolgov O. V.
Заглавие : Temperature-dependent s± ↔ s++ transitions in the multiband model for Fe-based superconductors with impurities
Коллективы : Russian Foundation for Basic Research [16-02-00098]; Presidium of RAS Program for the Fundamental Studies [12]; "BASIS" Foundation for Development of Theoretical Physics and Mathematics; Gosbudget program [0356-2017-0030]
Место публикации : Symmetry. - Basel, 2018. - Vol. 10, Is. 8. - Ст.323. - ISSN 2073-8994, DOI 10.3390/sym10080323
Примечания : Cited References: 50. - This work was supported in part by the Russian Foundation for Basic Research (grant 16-02-00098), Presidium of RAS Program for the Fundamental Studies #12, and "BASIS" Foundation for Development of Theoretical Physics and Mathematics. MMK acknowledges support by the Gosbudget program #0356-2017-0030.
Предметные рубрики: IRON-BASED MATERIALS
Ключевые слова (''Своб.индексиров.''): unconventional superconductors--iron pnictides--iron chalcogenides--impurity scattering
Аннотация: We study the dependence of the superconducting gaps on both the disorder and the temperature within the two-band model for iron-based materials. In the clean limit, the system is in the s± state with sign-changing gaps. Scattering by nonmagnetic impurities leads to the change of the sign of the smaller gap, resulting in a transition from the s± to the s++ state with the sign-preserving gaps. We show here that the transition is temperature-dependent. Thus, there is a line of s±→s++ transition in the temperature–disorder phase diagram. There is a narrow range of impurity scattering rates, where the disorder-induced s±→s++ transition occurs at low temperatures, but then the low-temperature s++ state transforms back to the s± state at higher temperatures. With increasing impurity scattering rate, the temperature of such s++→s± transition shifts to the critical temperature Tc, and only the s++ state is left for higher amounts of disorder.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Averyanov E. M.
Заглавие : Splitting of polarized impurity fluorescence bands in the steady-state spectrum of an isotropic solution
Место публикации : JETP Letters. - 1994. - Vol. 59, Is. 1. - P.23-26. - ISSN 0021-3640
Примечания : Cited References: 12
Предметные рубрики: RELAXATION
Аннотация: A difference is predicted between the peaks, nu(VV) and nu(VH), Of the polarized components J(VV)(nu) and J(VH)(nu) in the steady-state spectrum of impurity fluorescence in an isotropic solution. This difference would result from a temporal correlation between an orientational Brownian diffusion of excited fluorescing molecules and a structural relaxation of the surrounding matrix molecules.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Klyuchantsev A. B., Dzebisashvili D. M.
Заглавие : Quantum transport via dot devices with arbitrarily strong interactions
Колич.характеристики :22 с
Место публикации : Phys. Scr. - 2023. - Vol. 98, Is. 3. - Ст.035811. - ISSN 00318949 (ISSN), DOI 10.1088/1402-4896/acb61e. - ISSN 14024896 (eISSN)
Примечания : Cited References: 49. - The authors would like to thank V V Val'kov and S.V. Aksenov for fruitful discussions
Аннотация: The paper develops a theory of tunneling electron transport through atomic-scale systems (or briefly quantum dots) with arbitrarily strong interaction. The theory is based on a diagram technique for nonequilibrium Green’s functions defined on Hubbard operators. The use of Hubbard operators, describing many-body states of an entire quantum dot, makes it possible to represent the Hamiltonian of the quantum dot in a universal diagonal form and consider its coupling with two leads within the perturbation theory. It is shown that in the case when all Hubbard operators are defined for the same site, some rules of the diagram technique for Hubbard operators, initially developed for lattice models, have to be modified. As an example of the application of the modified theory, the current-voltage characteristics of the single-impurity Anderson model with infinitely large Coulomb repulsion are calculated. It is shown that taking into account the multiple electron tunneling processes with spin flips results in the dip in the center of the Lorentz distribution peak, describing the density of states of the one level Anderson impurity coupled with two leads. The emergence of this dip in the density of states leads to a peculiar feature in the bias voltage dependence of the differential conductivity, which can be detected experimentally.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : AVERYANOV E. M.
Заглавие : POLARIZED LUMINESCENCE SPECTRUM OF IMPURITY LIQUID-CRYSTAL - THE DEGENERATION LIFTED AND RENEWED BY RELAXATION
Место публикации : Zhurnal Eksperimentalnoi Teor. Fiz.: MEZHDUNARODNAYA KNIGA, 1993. - Vol. 103, Is. 6. - P2018-2038. - ISSN 0044-4510
Примечания : Cited References: 45
Предметные рубрики: RESOLVED FLUORESCENCE DEPOLARIZATION
UNIAXIAL MOLECULAR SAMPLES
NEMATIC ORDER PARAMETERS
EXCITED-STATES
SPECTROSCOPY
MEMBRANES
FLUOROPHORES
ORIENTATION
TRANSITION
DYES
Аннотация: The general molecular-statistical approach is proposed for the analysis or the polarized luminescence spectrum for impurity molecule of an arbitrary symmetry in the nematic liquid crystal matrix. On the particular example of uniaxial molecules the influence of features of the molecular electron structure, orientational statistics, molecular dynamics, and features of the anisotropic intermolecular coupling upon the positions of maxima v(if)(t) of impurity fluorescence polarized bands J(ij)(t) is studied. For the first time it is shown that all these factors significantly affect the degree of spectrum v(ij)(t) degeneration. For t not-equal 0, relaxation of excited impurity molecule subsystem toward the orientational distribution lifts a partial degeneration of spectrum v(ij), occuring at t not-equal 0, and renews partial or total degeneration of spectrum v(ij) in the limit t = infinity. In the lack of the spectrum v(ij) degeneration for t = 0 the relaxation may restore partial degeneration for t not-equal 0 as a function of the features of electron structure of molecules. The results of work explain the familiar experimental data on the number of independent component v(ij) and relation between them, on dependence of v(ij) upon the order of matrix and impurity subsystem, on the mutual relation in the positions of impurity band polarized component in the absorption and fluorescence spectra.
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15.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Chzhan A.V., Patrin G.S., Isaeva I.N.
Заглавие : Photo-induced Relaxation Self-Oscillations of Stripe Structures in FeBO(3)
Место публикации : DEFECTS AND DIFFUSION IN METALS: AN ANNUAL RETROSPECTIVE XI. - STAFA-ZURICH: TRANS TECH PUBLICATIONS LTD, 2009. - Vol. 293. - С. 115-119. - (Defect and Diffusion Forum Series). - ISBN 1012-0386
Примечания : Cited Reference Count: 6
Ключевые слова (''Своб.индексиров.''): impurity centers--induced magnetic anisotropy--iron borate--relaxation
Аннотация: Photo-induced self-oscillations of stripe structures are studied in FeBO(3) crystals at low temperatures. Experimental data show that the observed oscillations have a relaxational character. On the basis of the research carried out, a model for such oscillations is presented.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : OVCHINNIKOV S. G.
Заглавие : NOVEL MECHANISM FOR THE FORMATION OF IMPURITY LEVELS IN SEMICONDUCTORS WITH THE STRONG ELECTRON CORRELATIONS
Место публикации : Zhurnal Eksperimentalnoi Teor. Fiz.: MEZHDUNARODNAYA KNIGA, 1992. - Vol. 102, Is. 2. - P534-540. - ISSN 0044-4510
Примечания : Cited References: 8
Аннотация: In the framework of the generalized tight binding method involving the strong electron correlations it is shown that in spite of the lattice regularity the impurity-like localized levels may arise within the semiconducting gap with the deviation of the electron concentration from the integer value. The appearance of these levels is due to the contribution of multi-electron excited terms into the single-particle density of states.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Averyanov E. M., Gunyakov V. A.
Заглавие : New features in the structural relaxation of a nematic liquid-crystal doped with luminescent impurity molecules
Место публикации : JETP Letters. - 1993. - Vol. 57, Is. 8. - P.492-496. - ISSN 0021-3640
Примечания : Cited References: 15
Предметные рубрики: FLUORESCENCE DEPOLARIZATION
ORIENTATIONAL RELAXATION
FLUOROPHORES
Аннотация: A new approach is proposed for interpreting the polarized fluorescence spectra of an impure liquid crystal in which the orientational order of excited impurity molecules has undergone relaxation. This approach has also been realized experimentally. The new experimental data demonstrate a new relaxation process with a time scale on the order of 10(-11)-10(-9) s.
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18.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Efremov D. V., Korshunov M. M., Golubov A. A., Dolgov O. V.
Заглавие : Multiband model for the dynamical conductivity of superconducting pnictides manifestation of impurity induced s±às++ transition
Коллективы : Ettore Majorana Foundation, Centre for Scientific Culture, Rome International Center for Materials Science, International School of Solid State Physics, "Phase separation and Superstripes in High Temperature Superconductors and Related Materials", Int. Conf. (55; 2012 ; July ; 11-17; Erice (Sicily), Italy)
Место публикации : International conferences «Phase separation and Superstripes in High Temperature Superconductors and Related Materials (Superstripes-2012)». - 2012. - P.127
Аннотация: The multiband (4 x4 bands) model and its reduction to the effective two-band model taking into account the strong interaction with intermediate spin-fluctuations have been successively applied to the description of the properties of Ba1-xKxFeAs2. On the base of this approach and using the extension of the formalism developed for the multiband system MgB2 we have calculated free energy and frequency dependent optical complex conductivity \ sigma ( \omega ,T) in the superconducting as well as the normal states of pnictides. An application of the presented approach to the ellipsometry data for single crystals of Ba1-xKxFeAs2 allows to describe some experimental features connected to multigap nature and strong coupling effects. Effects of rather strong nonmagnetic impurities beyond the Born approximation which can lead to the transitions in the superconducting order parameter S+- - S++ were investigated.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Dolgov O. V., Efremov D. V., Korshunov M. M., Charnukha A., Boris A. V., Golubov A. A.
Заглавие : Multiband description of optical conductivity in ferropnictide superconductors
Место публикации : J. Supercond. Nov. Magn. - 2013. - Vol. 26, Is. 8. - P.2637-2640. - ISSN 1557-1939, DOI 10.1007/s10948-013-2150-3
Ключевые слова (''Своб.индексиров.''): effects of disorder--multiband superconductivity--optical conductivity--effects of disorder--experimental datum--multi-band superconductors--multiband superconductivity--novel superconductor--order parameter symmetry--paramagnetic impurity--single-band superconductors--optical conductivity--paramagnetism--superconductivity--superconducting materials
Аннотация: We study optical properties of the multiband superconductors with an s В± order parameter symmetry. By comparing results of our theory with experimental data on optical conductivity for Ba0.68K 0.32Fe2As2 single crystals, we show that satisfactory description of the novel superconductors can be obtained only considering a strong electron-boson coupling. We reexamine the effect of disorder and demonstrate that multiband superconductors are more robust with respect to it than naively expected by simple analogy with paramagnetic impurities in single-band superconductors. Moreover, disorder may give rise to new effects, in particular to a phase transition s В±s ++. We discuss how the systematic study of disorder impact on the density of states and the optical conductivity may provide information on the underlying order parameter structure. В© 2013 Springer Science+Business Media New York.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fransson J., Eriksson O., Sandalov I.
Заглавие : Many-body approach to spin-dependent transport in quantum dot systems
Место публикации : Phys. Rev. Lett.: AMERICAN PHYSICAL SOC, 2002. - Vol. 88, Is. 22. - Ст.226601. - ISSN 0031-9007, DOI 10.1103/PhysRevLett.88.226601
Примечания : Cited References: 37
Предметные рубрики: SINGLE-ELECTRON TRANSISTOR
COULOMB-BLOCKADE
ANDERSON IMPURITY
ROOM-TEMPERATURE
TUNNEL-JUNCTIONS
EVEN NUMBER
MODEL
MAGNETORESISTANCE
OSCILLATIONS
CONDUCTANCE
Аннотация: By means of a diagram technique for Hubbard operators, we show the existence of a spin-dependent renormalization of the localized levels in an interacting region, e.g., quantum dot, modeled by the Anderson Hamiltonian with two conduction bands. It is shown that the renormalization of the levels with a given spin direction is due to kinematic interactions with the conduction subbands of the opposite spin. The consequence of this dressing of the localized levels is a drastically decreased tunneling current for ferromagnetically ordered leads compared to that of paramagnetically ordered leads. Furthermore, the studied system shows a spin-dependent resonant tunneling behavior for ferromagnetically ordered leads.
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