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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : VALKOV V. V., OVCHINNIKOV S. G.
Заглавие : HUBBARD OPERATORS AND SPIN-WAVE THEORY OF HEISENBERG MAGNETS WITH ARBITRARY SPIN
Место публикации : Theor. Math. Phys.: PLENUM PUBL CORP, 1982. - Vol. 50, Is. 3. - P306-313. - ISSN 0040-5779, DOI 10.1007/BF01016463
Примечания : Cited References: 32
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : VALKOV V. V., VALKOVA T. A.
Заглавие : INFLUENCE OF CUBIC ANISOTROPY ON THE GROUND-STATE AND THERMODYNAMIC PROPERTIES OF HEISENBERG MAGNETS
Место публикации : Theor. Math. Phys.: PLENUM PUBL CORP, 1984. - Vol. 59, Is. 3. - P617-625. - ISSN 0040-5779, DOI 10.1007/BF01018202
Примечания : Cited References: 18
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuzmin E. V.
Заглавие : Ground-state and excitation spectrum of disordered heisenberg magnets
Место публикации : Zhurnal Eksperimentalnoi Teor. Fiz. - 1984. - Vol. 86, Is. 3. - P.981-994. - ISSN 0044-4510
Примечания : Cited References: 21
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : APLESNIN S. S.
Заглавие : CRITICAL-BEHAVIOR OF DILUTED ISING MAGNETS WITH ANISOTROPIC EXCHANGE INTERACTION DISTRIBUTION
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1984. - Vol. 26, Is. 11. - P3355-3361. - ISSN 0367-3294
Примечания : Cited References: 19
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : MARTYNOV S. N.
Заглавие : CORRELATION-FUNCTIONS AND ELECTRON-SPIN-RESONANCE LINEWIDTH OF TWO-DIMENSIONAL HEISENBERG MAGNETS
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1986. - Vol. 28, Is. 10. - P3006-3011. - ISSN 0367-3294
Примечания : Cited References: 15
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : PETRAKOVSKII G. A., APLESNIN S. S.
Заглавие : MONTE-CARLO STUDY OF DILUTE QUASI-2-DIMENSIONAL MAGNETS WITH RANDOM INTERACTIONS
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1987. - Vol. 29, Is. 2. - P515-522. - ISSN 0367-3294
Примечания : Cited References: 16
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Martynov S. N.
Заглавие : Single-ion-anisotropy and electron-spin-resonance linewidth in quasi-low-dimensional heisenberg magnets
Место публикации : Phys. Status Solidi B. - 1988. - Vol. 146, Is. 2. - P.691-696. - ISSN 0370-1972, DOI 10.1002/pssb.2221460229
Примечания : Cited References: 18
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Valkov V. V., MATSULEVA G. N., Ovchinnikov S. G.
Заглавие : EFFECT OF STRONG CRYSTALLINE FIELD ON THE SPECTRAL PROPERTIES OF MAGNETS WITH BIQUADRATIC EXCHANGE
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1989. - Vol. 31, Is. 6. - P60-68. - ISSN 0367-3294
Примечания : Cited References: 29
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : VALKOV V. V., FEDOSEEV B. V.
Заглавие : PHASE-TRANSITIONS IN ANISOTROPIC NON-HEISENBERG MAGNETS WITH A TENSOR ORDER PARAMETER
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1990. - Vol. 32, Is. 12. - P3522-3530. - ISSN 0367-3294
Примечания : Cited References: 13
Предметные рубрики: BIQUADRATIC EXCHANGE
FERROMAGNET
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Mitskan V. A.
Заглавие : Magnetic-field-induced phase transition in a two-dimensional quantum magnet with plaquette distortion
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2007. - Vol. 105, Is. 1. - P90-93. - ISSN 1063-7761, DOI 10.1134/S1063776107070199
Примечания : Cited References: 10
Предметные рубрики: GROUND-STATE
CRYSTALS
Ключевые слова (''Своб.индексиров.''): antiferromagnetism--magnetic field effects--magnets--phase diagrams--problem solving--spectrum analysis--plaquette distortion--quantum heisenberg magnet--quantum transition--two-dimensional quantum magnet--phase transitions
Аннотация: Magnetic field effect on the structure of the ground state of a two-dimensional quantum Heisenberg magnet is analyzed. A plaquette representation is used to solve the self-consistent problem and calculate the collective excitation spectrum in a magnetic field. Conditions are found for quantum transition between non-magnetic and oblique antiferromagnetic phases. The change in the ground state of the system is associated with disappearance of the gap in the spin excitation spectrum. Effects of frustration and magnetic field on the spectrum are analyzed. A phase diagram of stable singlet and magnetically ordered phases is presented.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Dubrovskiy A. A., Shaykhutdinov K. A., Popkov S. I., Petrov M. I.
Заглавие : Peculiarities of the time evolution of magnetoresistance of granular HTSC in a constant applied magnetic field
Коллективы :
Место публикации : Solid State Commun. - 2008. - Vol. 147, Is. 7-8. - P.284-287. - ISSN 0038-1098, DOI 10.1016/j.ssc.2008.05.044
Примечания : Cited References: 17. - This work was Supported by program "Quantum macrophysics" No. 3.4 of RAS and integration project No. 3.4 of SB RAS and in part by KSF, grant 18G011. D.A.B. and A.A.D. acknowledge the Russian Science Support Foundation.
Предметные рубрики: CRITICAL-STATE
SUPERCONDUCTORS
COMPOSITES
HYSTERESIS
RESISTANCE
Ключевые слова (''Своб.индексиров.''): superconductors--flux pinning and creep--tunneling--superconductors--flux pinning and creep--tunneling--agricultural products--carbon fiber reinforced plastics--copper oxides--electric conductivity--electric resistance--evolutionary algorithms--ferromagnetism--galvanomagnetic effects--grain (agricultural product)--health--hysteresis--magnetic devices--magnetic field effects--magnetic field measurement--magnetic fields--magnetic materials--magnetoelectronics--magnetoresistance--semiconductor metal boundaries--superconducting magnets--superconductivity--yttrium barium copper oxides--p ,p ,t measurements--applied (co)--applied magnetic fields--constant magnetic field (cmf)--elsevier (co)--evolution (co)--external fields--field induced--flux creep--hysteretic behavior--josephson couplings--low magnetic fields--magnetic (ce)--poly crystalline--superconducting grains--time evolutions--time relaxation--magnetism
Аннотация: The time evolution of the magnetoresistance of bulk YBCO + CuO composites at T = 4.2 K in constant applied magnetic fields was studied to clarify the mechanism of hysteretic behavior of magnetoresistance R(H) of granular HTSC. The composites represent "model" granular HTSC with weakened Josephson coupling between superconducting (YBCO) crystallites. It was found for the first time that on the ascending branch of R(H) dependence, the resistance at H = const decreased with time while on the descending branch, the resistance increased with time in ail applied constant magnetic field. In the range of low magnetic fields (below the minimum point of the descending branch of the R(H) dependence), the resistance at H const decreased again. Similar measurements performed oil pure polycrystalline YBCO at T = 77.4 K have shown that the behavior of evolution of resistance with time is similar to that observed for the composite. This proves the peculiarity of time evolution of maignetoresistance to be a common feature of granular HTSCs. The behavior revealed is well described by the model Of granular HTSC, where the intergrain media is in an effective magnetic field which is the superposition of the external field and the field induced by superconducting grains. The time evolution of resistance reflects the time relaxation of magnetization of HTSC grains due to the intragrain flux Creep Processes. (C) 2008 Elsevier Ltd. All rights reserved.
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12.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Piskunova N. I., Aplesnin S. S., Moskvin A. I.
Заглавие : Study of the magnetic structure of the low-dimensional magnets upon orbital ordering by quantum Monte Carlo method
Коллективы : Moscow International Symposium on Magnetism, Московский государственный университет им. М.В. Ломоносова, Российский фонд фундаментальных исследований
Место публикации : Moscow Int. Symp. on Magnet. (MISM-2008): June 20-25, 2008, Moscow : book of abstract. - 2008. - Ст.23PO-12-30. - p.532-533
Примечания : Библиогр.: 4. - This work was supported by the Russian Foundation for Basic Research project no.05-02-97710
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13.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Valkov V. V., Valkova T. A., Jolobova N. N.
Заглавие : The influence of the quantum fluctuations on the ground state and spectral properties of 2D magnets with cubic symmetry four-spin exchange interactions
Коллективы : Moscow International Symposium on Magnetism, Московский государственный университет им. М.В. Ломоносова, Российский фонд фундаментальных исследований
Место публикации : Moscow Int. Symp. on Magnet. (MISM-2008): June 20-25, 2008, Moscow : book of abstract. - 2008. - Ст.23PO-12-5. - p.510-511
Примечания : This work was supported by the program of Presidium of RAS Quantum macrophysics, Russian Foundation for Basic Research (project no. 07-02-00226), and Integration project 3.4 SB RAS
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Varnakov S. N., Komogortsev S. V., Ovchinnikov S. G., Bartolome J., Sese J.
Заглавие : Magnetic properties and nonmagnetic phases formation in (Fe/Si)(n) films
Коллективы :
Разночтения заглавия :авие SCOPUS: Magnetic properties and nonmagnetic phases formation in (Fe/Si) n films
Место публикации : J. Appl. Phys.: AMER INST PHYSICS, 2008. - Vol. 104, Is. 9. - Ст.94703. - ISSN 0021-8979, DOI 10.1063/1.3005973
Примечания : Cited References: 23. - This work was supported by the Russian Academy of Science program "Spintronics," the complex integration project of the Siberian Branch of the Russian Academy of Science. 3.5, the Russian Foundation for Basic Research (Grant No. 07-03-00320), the "Ramon y Cajal" program, and Project No. MAT 2005/01272 of the Spanish Ministry of Education and Science.
Предметные рубрики: FE/SI/FE TRILAYER FILMS
GIANT MAGNETORESISTANCE
ULTRAHIGH-VACUUM
SUPERLATTICES
MULTILAYERS
EXCHANGE
Ключевые слова (''Своб.индексиров.''): activation energy--integral equations--magnetic properties--magnetization--magnets--multilayers--rate constants--silicon--thermal evaporation--vacuum--vacuum evaporation--fe layers--high temperatures--interface layers--irreversible behaviors--kinetic equations--n films--nonmagnetic--nonmagnetic phases--prefactor--quantitative analysis--rate equations--synthetic procedures--temperature dependences--ultrahigh-vacuum systems--phase interfaces
Аннотация: The magnetization of Fe/Si multilayers, grown by thermal evaporation in an ultrahigh vacuum system, was investigated at high temperatures. Magnetization and its temperature dependence up to a high temperature of 800 K depend on individual Fe layer thickness d(Fe). This dependence is the result of the formation of an Fe-Si interface layer (nonmagnetic phase) during the synthetic procedure. The fraction of this Fe-Si nonmagnetic phase is estimated versus dFe. At temperatures higher than 400 K an irreversible decrease in the magnetization occurs. A quantitative analysis of this irreversible behavior is proposed in terms of an exponential diffusion-like kinetic equation for the reaction that produces the Fe-Si nonmagnetic phase. The coefficients of the rate equation are the activation energy E(a) and the prefactor D(0), which have been determined for different d(Fe). (C) 2008 American Institute of Physics. [DOI: 10.1063/1.3005973]
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Klauss H. H., Luetkens H., Klingeler R., Hess C., Litterst F. J., Kraken M., Korshunov M. M., Eremin I., Drechsler S. L., Khasanov R., Amato A., Hamann-Borrero J. E., Leps N., Kondrat A., Behr G., Werner J., Buchner B.
Заглавие : Commensurate spin density wave in LaFeAsO: A local probe study
Место публикации : Phys. Rev. Lett.: AMER PHYSICAL SOC, 2008. - Vol. 101, Is. 7. - Ст.77005. - ISSN 0031-9007, DOI 10.1103/PhysRevLett.101.077005
Примечания : Cited References: 28
Предметные рубрики: LAYERED QUATERNARY COMPOUND
SUPERCONDUCTIVITY
Ключевые слова (''Своб.индексиров.''): arsenic compounds--chlorine compounds--ferromagnetism--magnetic materials--magnetic properties--magnetization--magnets--molybdenum--phase transitions--spin density waves--commensurate spin density wave--external fields--magnetic orders--muon spin relaxations--order parameter--ordered moments--probe measurements--ssbauer spectroscopy--structural phase transition--sublattice magnetizations--temperature dependences--spin dynamics
Аннотация: We present a detailed study on the magnetic order in the undoped mother compound LaFeAsO of the recently discovered Fe-based superconductor LaFeAsO(1-x)F(x). In particular, we present local probe measurements of the magnetic properties of LaFeAsO by means of (57)Fe Mossbauer spectroscopy and muon-spin relaxation in zero external field along with magnetization and resistivity studies. These experiments prove a commensurate static magnetic order with a strongly reduced ordered moment of 0.25(5)mu(B) at the iron site below T(N)=138 K, well separated from a structural phase transition at T(S)=156 K. The temperature dependence of the sublattice magnetization is determined and compared to theory. Using a four-band spin density wave model both, the size of the order parameter and the quick saturation below T(N) are reproduced.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Edelman I., Kliava J.
Заглавие : Oxide glasses with magnetic nanoparticles: transparent magnets (Faraday rotation and electron magnetic resonance studies)
Коллективы : RFBR-CNRS [07-02-92174]
Разночтения заглавия :авие SCOPUS: Oxide glasses with magnetic nanoparticles: Transparent magnets (Faraday rotation and electron magnetic resonance studies)
Место публикации : Phys. Status Solidi B. - 2009. - Vol. 246, Is. 10. - P.2216-2231. - ISSN 0370-1972, DOI 10.1002/pssb.200945169
Примечания : Cited References: 87. - This work is supported in part by RFBR-CNRS joint project, grant No 07-02-92174. We are grateful to E. Petrakovskaja and O. Ivanova for measuring and discussing, respectively, the EMR spectra in thermally treated samples and the FR spectral and magnetic field dependences.
Предметные рубрики: SPIN-HAMILTONIAN PARAMETERS
SINGLE-DOMAIN PARTICLES
SUPERPARAMAGNETIC RESONANCE
CRYSTALLIZATION BEHAVIOR
FERRIMAGNETIC RESONANCE
PARAMAGNETIC-RESONANCE
TEMPERATURE-DEPENDENCE
COMPUTER-SIMULATIONS
FINE PARTICLES
BORATE GLASSES
Аннотация: In the first part of this paper we outline the state of the art in the field of magnetic nanoparticles in oxide glasses. We describe the theoretical background of two complementary techniques used for the studies of the state of paramagnetic ions, clusters and magnetic particles in a diamagnetic matrix, viz., magnetooptical Faraday rotation (FR) and electron magnetic resonance (EMIR) and we overview previous results obtained with these techniques for several glass systems. In the second part, we highlight the case of potassium-alumina-borate glasses - a glassy system where doping with paramagnetic oxides results in formation of magnetic particles at very low contents of paramagnetic additions: Fe(2)O(3) and MnO. In the special case when the ratio of the iron and manganese oxides in the charge is 3/2, magnetic nanoparticles with characteristics close to those of manganese ferrite are formed already at the first stage of the glass preparation. After thermal treatment all glasses show FR and EMR spectra attesting to the presence of superparamagnetic nanoparticles, characterized by relatively broad size and shape distributions. The formation of magnetic nanoparticles confers to these glasses magnetic and magnetooptical properties typical of magnetically ordered substances. At the same time, the glasses remain transparent in a part of the visible and near infrared spectral range and display a high FR value. Such properties make them particularly interesting for use as new media for various magneto-optical devices. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kveglis L. I., Abylkalykova R. B., Noskov F. M., Arkhipkin V. G., Musikhin V. A., Cherepanov V. N., Niavro A. V.
Заглавие : Local electron structure and magnetization in beta-Fe86Mn13C
Коллективы : International Conference on Nano-structures Self-Assembling
Разночтения заглавия :авие SCOPUS: Local electron structure and magnetization in β- Fe86Mn13C
Место публикации : Superlattices Microstruct. - 2009. - Vol. 46, Is. 1-2. - P.114-120. - ISSN 0749-6036, DOI 10.1016/j.spmi.2008.11.023
Примечания : Cited References: 12
Предметные рубрики: PHASE
Ключевые слова (''Своб.индексиров.''): frank-kasper structure--local electron structure--spin-polarized electronic conditions--frank-kasper structure--local electron structure--spin-polarized electronic conditions--austenite grain--austenitic--c-steel--close packed structures--dynamic loadings--electron structures--frank-kasper structure--induction method--intergranular--local electron structure--local electronic structures--local magnetization--self-consistent field--spin-polarized electronic conditions--transition regions--austenite--diffraction--electronic structure--electrons--magnets--manganese--manganese compounds--optical microscopy--phase transitions--spin dynamics--steel--textures--magnetization--frank-kasper structure--local electron structure--spin-polarized electronic conditions--austenite grain--austenitic--c-steel--close packed structures--dynamic loadings--electron structures--frank-kasper structure--induction method--intergranular--local electron structure--local electronic structures--local magnetization--self-consistent field--spin-polarized electronic conditions--transition regions--austenite--diffraction--electronic structure--electrons--magnets--manganese--manganese compounds--optical microscopy--phase transitions--spin dynamics--steel--textures--magnetization
Аннотация: The aim of the work is to elucidate the origin of magnetization presence in austenitic Fe86Mn13C steel after dynamic loading. The observation of microstructures in the region of transition from FCC austenitic Fe86Mn13C steel to FK12 + FK14 type of Frank-Kasper tetrahedral close packed structure is described. We used the methods of optical microscopy, electron microscopy, electron diffraction and X-ray-diffraction to investigate the phase transition region. Changes of local magnetization were estimated by induction method. To explain the magnetization origin of the sample consisting of austenite grains and intergranular layers, which have Frank-Kasper's structure (FK12 + FK14) typical of beta-Fe-Mn, the local electronic structure has been investigated for intergranular layers. The local electron structure of FK12 and FK14 clusters have been simulated by method of self-consistent field to understand the nature of non-zero magnetization of the Fe87Mn13 alloy exposed by shock deformation. It was shown, that numbers of states with upward and downward spins are not equal. Therefore the occurrence of magnetization is possible. (c) 2009 Published by Elsevier Ltd
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chzhan A.V., Vasiliev A. D., Isaeva T. N., Patrin G. S.
Заглавие : Research of features magnetic permeability and domain structures in Fe 2O3:GA crystals near the morin transition
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Solid State Phenomena. - 2009. - Vol. 152-153. - С. 29-32. - ISSN 10120394 (ISSN); 390845168X (ISBN); 9783908451686 (ISBN), DOI 10.4028/www.scientific.net/SSP.152-153.29
Ключевые слова (''Своб.индексиров.''): antiferromagnetic--domain structure--hematite--morin transition--weakly ferromagnetic--antiferromagnetic materials--antiferromagnetism--capillarity--crystal impurities--crystals--ferromagnetic materials--ferromagnetic resonance--ferromagnetism--gallium--hematite--iron ores--magnetic permeability--oxide minerals--permanent magnets--antiferromagnetism--crystal impurities--ferromagnetic materials--ferromagnetism--gallium--hematite--iron compounds--magnetic materials--magnetic permeability--magnetism--afm--antiferromagnetic--antiferromagnetic domains--antiferromagnetics--basal planes--domain configurations--domain structure--morin transitions--multi-layered structure--weakly ferromagnetic--magnetic domains--magnetic domains
Аннотация: Specially picked up web-chamber is used for visualization of domain structure in hematite. An analysis of domain configuration shows, that domain structure of hematite in a basal plane represents multilayered structure which contains domains both in paralleled thickness and in the parallel basal planes. The temperature features of magnetic permeability and domain structures in Fe2O3:Ga crystals near the Morin transition are investigated. Observable changes of magnetic permeability and changes in domain structure confirm that transition from AFM to WFM occurs in the hematite with Ga impurity as transition of the first sort. Results of research of antiferromagnetic and weakly ferromagnetic resonances (AFMR and WFMR) in these compounds are presented.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shneyder E. I., Ovchinnikov S. G.
Заглавие : Isotope effect in the model of strongly correlated electrons with the magnetic and phonon superconducting pairing mechanisms
Коллективы : Presidium of the Russian Academy of Sciences [40]; Russian Academy of Sciences; Russian Foundation for Basic Research [09-02-00127]
Место публикации : J. Exp. Theor. Phys. - 2009. - Vol. 109, Is. 6. - P.1017-1021. - ISSN 1063-7761, DOI 10.1134/S1063776109120139
Примечания : Cited References: 42. - This study was financed under programs 5.7 and "Quantum Physics of Condensed Matter" of the Presidium of the Russian Academy of Sciences, integration project no. 40 of the Siberian Branch and Ural Division of the Russian Academy of Sciences, and the Russian Foundation for Basic Research (project no. 09-02-00127).
Предметные рубрики: CUPRATE SUPERCONDUCTORS
PHASE-TRANSITIONS
3-CENTER INTERACTIONS
HUBBARD-MODEL
TEMPERATURE
LA2-XSRXCUO4
SYMMETRY
EXCHANGE
COPPER
BI2SR2CACU2O8+DELTA
Ключевые слова (''Своб.индексиров.''): ab initio calculations--calculated values--cooper pairing--isotope effect--magnetic mechanisms--order of magnitude--pairing mechanism--phonon mechanism--strongly correlated electrons--superconducting pairing mechanism--superconducting state--type theory--carrier mobility--electron-phonon interactions--isotopes--superconductivity--superconducting magnets
Аннотация: Peculiarities of the temperature isotope effect in a BCS-type theory describing the exchange and phonon mechanisms of Cooper pairing in a system of strongly correlated electrons are considered. The electron-phonon interaction constant is determined from the fitting of the calculated value of the isotope-effect index to the observed value with the parameters of La(2 - x) Sr (x) CuO(4) obtained from ab initio calculations. The value of this constant indicates that the contribution from the traditional pairing mechanism to the superconducting state is of the same order of magnitude as the contribution from the magnetic mechanism.
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20.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ignatchenko V.A.
Заглавие : Effects of correlated inhomogeneities of the spectral properties of disordered ferro magnets and superlattices
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Уральское отделение РАН
Место публикации : IV Euro-Asian Symposium "Trends in MAGnetism" Nanospintronics (EASTMAG-2010). School for young scientist "Spintronics": June 28 - Lule 2, 2010"Book of abstracts. - Ekaterinburg, 2010. - P.300 (Invited)
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