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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Makovetskii G., Demidenko O. F., Galyas A., Yanushkevich K., Aplesnin S. S., Romanova O. B., Ryabinkina L. I.
Заглавие : Magnetic and thermoelectric properties of the Mn1-X Ni (X) S solid solutions
Место публикации : J. Korean Phys. Soc. - 2013. - Vol. 62, Is. 12. - P.2059-2062. - ISSN 0374-4884, DOI 10.3938/jkps.62.2059
Примечания : Cited References: 9. - This study was supported by the Russian Foundation for Basic Research project No. 09-02-92001-NNS_a; No.12-02-90004 Bel_a; No. 12-02-00125_a; No. 11-02-98018 r_sibir_a, F12R-060
Предметные рубрики: NICKEL SULPHIDE
TRANSITION
Ключевые слова (''Своб.индексиров.''): antiferromagnetic materials--semiconductor conductivity--manganese sulphides
Аннотация: The new sulphide Mn1-X Ni (X) S (0X a parts per thousand currency sign 0.1) solid solutions are synthesized. The structural, magnetic, electric and thermoelectric properties of the obtained materials have been studied. The X-ray diffraction analysis has shown that the synthesized Mn1-X Ni (X) S samples have a NaCl-type FCC lattice. The Mn1-X Ni (X) S samples are antiferromagnets with the Neel temperature (T (N) T (N) . The conductivity type change from the hole to the electronic at X 0.05 is revealed on the basis of the thermoelectric power measurements. The resistivity and thermopower behaviors are explained in terms of the impurity subband formation into MnS electron excitation gap.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Sofronova S. N., Kolesnikova E. M., Eremin E. V., Volkov N. V., Bezmaternykh L. N., Molokeev M. S.
Заглавие : Temperature-field evolution of antiferromagnetic phase of ludwigite Ni[[d]]3-x[[/d]]Mn[[d]]x[[/d]]BO[[d]]5[[/d]]
Коллективы : Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism
Место публикации : V Euro-Asian simposium "Trend in MAGnetism": Nanomagnetism: abstracts. - Vladivostok: FEFU, 2013. - С. 242. - ISBN 978-5-7444-3124-2
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Изотов, Андрей Викторович, Беляев, Борис Афанасьевич, Соловьев, Платон Николаевич, Волошин, Александр Сергеевич
Заглавие : Микромагнитное моделирование и численный анализ процессов перемагничивания двухслойных тонкопленочных структур ферромагнетик/антиферромагнетик
Место публикации : Изв. вузов. Физика. - 2013. - Т. 56, № 8/2. - С. 230-232
Примечания : Работа выполнена при финансовой поддержке ФЦП «Научные и научно-педагогические кадры инновационной России 2009−2013»
Ключевые слова (''Своб.индексиров.''): микромагнитное моделирование--ферромагнетик/антиферромагнетик--петля гистерезиса--обменное смещение--коэрцитивная сила--micromagnetic simulation--coercivity--ferromagnetic/antiferromagnetic--hysteresis loop--exchange bias
Аннотация: На основе численного микромагнитного моделирования проведено исследование процессов перемагничивания двухслойных тонкопленочных структур ферромагнетик/антиферромагнетик. Сделан анализ влияния параметров структуры на величину поля обменного сдвига и коэрцитивной силы. Результаты расчета сравниваются с экспериментальными и теоретическими данными.On the basis of the numerical micromagnetic simulation the study of magnetization reversal processes in thin-film ferromagnetic/antiferromagnetic bilayers was performed. The analysis of influence of parameters of the structure on exchange bias field and coercive force was carried out. Calculation results are compared with experimental and theoretical data.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Dudnikov V. A., Velikanov D. A., Kazak N. V., Michel C. R., Bartolome J., Arauzo A., Ovchinnikov S. G., Patrin G. S.
Заглавие : Antiferromagnetic ordering in REM cobaltite GdCoO3
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 54, Is. 1. - P.79-83. - ISSN 1063-7834, DOI 10.1134/S106378341201009X
Примечания : Cited References: 16. - This study was supported by the program of the Branch of Physical Sciences of the Russian Academy of Sciences "Strong Electron Correlations," the Russian Foundation for Basic Research (project no. 09-02-00171-a), and Federal Agency for Science and Innovations (grant no. MK-5632.2010.2).
Предметные рубрики: SPIN-STATE
RCo3O3 R
Sm
Eu
Nd
Аннотация: Temperature and magnetic-field dependences of the static magnetization of polycrystalline cobaltite GdCoO3 have been measured. The magnetic properties of the GdCoO3 sample have been studied in the paramagnetic and antiferromagnetic states. The magnetic phase diagram has been constructed. The exchange field between the Gd-Gd sublattices and the anisotropy field have been estimated.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pankrats A. I., Sablina K. A., Velikanov D. A., Vorotynov A. M., Bayukov O. A., Eremin A. V., Molokeev M. S., Popkov S. I., Krasikov A. A.
Заглавие : Magnetic and dielectric properties of the PbFeBO4 single crystal
Место публикации : J. Magn. Magn. Mater.: Elsevier Science, 2014. - Vol. 353. - P.23 – 28. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2013.10.018. - ISSN 1873-4766
Примечания : Cited References: 21. - This work was supported by RFBR, Grant no. 13-02-00897
Предметные рубрики: HEMATITE
Ключевые слова (''Своб.индексиров.''): single crystal growth--magnetic susceptibility--magnetic phase transition--antiferromagnetic order--dielectric permittivity--magnetoelectric effect
Аннотация: PbFeBO4 single crystals up to 4x2.5x0.5 mm3 in size were grown by spontaneous crystallization from a solution in a melt and their magnetic and dielectric properties were investigated.The high Neel temperature TN=114 K and the absence of the broad maximum of susceptibility above the Neel temperature suggest that the PbFeBO4 crystal is a three-dimensional antiferromagnet.The magnetic susceptibility anisotropy in the ordered state indicates that the antiferromagnetic vector is directed along the orthorhombic c axis. The anomalies of dielectric permittivities ε' and ε″ were observed in both polycrystalline and single-crystal samples within thetemperature ranges where the short-and long-range magnetic orders are established.This confirms the correlation between the magnetic and electric subsystems in the crystal.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Romanova O., Gorev M. V., Velikanov D. A., Gamzatov A. G., Aliev A. M.
Заглавие : Magnetic and thermophysical properties of GdxMn1-xS solid solutions
Место публикации : J. Phys.: Condens. Matter. - 2013. - Vol. 25, Is. 2. - Ст.025802. - P. - ISSN 0953-8984, DOI 10.1088/0953-8984/25/2/025802
Ключевые слова (''Своб.индексиров.''): antiferromagnetic orders--band state--face-centered cubic lattices--magnetic phase transitions--paramagnetic phase--temperature dependence--antiferromagnetism--electron transitions--gadolinium--manganese--paramagnetism--sodium chloride--specific heat--organic polymers
Аннотация: The structural, magnetic, and thermophysical properties of cation-substituted sulfides GdXMn1-XS (0.04 ? X ? 0.25) with the NaCl-type face-centered cubic lattice have been investigated. The range of existence of long-range antiferromagnetic order has been established. The anomalies observed in the temperature dependence of the specific heat correspond to the temperatures of the magnetic phase transition. The anomaly in the specific heat caused by electron transitions between the 4f levels and d band states has been observed. It has been found that the coefficient of thermal expansion decreases with increasing concentration of substituents in the magnetically ordered region and remains nearly invariable in the paramagnetic phase. В© 2013 IOP Publishing Ltd.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Patrin K. G., Yakovchuk V.Yu., Patrin G. S., Yarikov S. A.
Заглавие : Magnetism and magnetoresistance in NiFe/Bi/NiFe films
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Diffusion and Defect Data Pt.B: Solid State Phenomena. - 2012. - Vol. 190. - P.439-442. - ISBN 1012-0394, DOI 10.4028/www.scientific.net/SSP.190.439. - ISBN 9783037854365
Ключевые слова (''Своб.индексиров.''): antiferromagnetic interaction--bi spacer--hysteresis loop--interlayer coupling--magnetization--magnetoresistance--permalloy--trilayer films--antiferro-magnetic interactions--giant magnetoresistive--interlayer coupling--interlayer interactions--permalloy--spacer thickness--squid magnetometry--trilayer film--trilayers--antiferromagnetism--bismuth--giant magnetoresistance--hysteresis loops--magnetic materials--magnetic resonance--magnetization--magnetoresistance--electric resistance
Аннотация: Interlayer interactions in FeNi/Bi/FeNi trilayers have been experimentally studied. Based on the data of SQUID magnetometry and magnetic resonance investigations, it is shown that the interlayer interaction is determined by a bismuth spacer thickness and temperature. The giant magnetoresistive effect in the trilayer films has been discovered. В© (2012) Trans Tech Publications.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Nelson C. S., Lobo R.P.S.M., Bezmaternykh L. N.
Заглавие : Ground State Properties of Antiferromagnetic Sm0.5Nd0.5Fe3(BO3)4
Коллективы : APS March Meeting (2012 ; 27 Feb.-2 March; Boston, Massachusetts, USA), American Physical Society March Meeting (2012 ; 27 Feb.-2 March; Boston, Massachusetts, USA)
Место публикации : Bulletin of the American Physical Society. - 2012. - Vol. 57, № 1 . - P.316
Аннотация: We report x-ray scattering and polarized infrared reflectivity measurements of the substituted ferroborate Sm 0.5 Nd 0.5 Fe 3 (BO 3 ) 4 . Below T N = 33 K, a new set of commensurate peaks with resonant enhancements at the rare earth L edges indicates a doubling of the magnetic structure along the c-axis and simultaneous ordering of the rare earth and iron ions. Rare earth spin polarizations decrease rapidly with increasing temperature, in contrast to that of the iron ions. Shell-specific measurements of the rare earth spin polarizations indicate similar behaviors of the Sm and Nd 5d states, while the Sm 4f and 5d states have different temperature dependences. Along the c-axis we observe negative thermal expansion below ∼ 75 K and a strong phonon softening from room temperature down to T N , at which it freezes in frequency. Also at T N we observe the appearance of an electromagnon in the ab-plane that gets its spectral weight from the lowest frequency phonon. These results indicate a lattice instability linked to magnetism with a strong coupling between magnetic and elastic properties.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Dzebisashvili D. M., Val'kov V. V., Barabanov A. F.
Заглавие : Fermi surface evolution in the ensemble of spin-polarized quasiparticles in La2 - xSrxCuO4
Место публикации : JETP Letters. - 2014. - Vol. 98, Is. 9. - P.528-533. - ISSN 0021-3640, DOI 10.1134/S0021364013220049. - ISSN 1090-6487
Примечания : Cited References: 36. - This work was supported by the Presidium of the Russian Academy of Sciences (program "Quantum Mesoscopic and Disordered Structures"), by the Russian Foundation for Basic Research (project nos. 13-02-00909, 13-02-00523, and 11-02-98007-Siberia), and by the Dynasty Foundation.
Предметные рубрики: SADDLE-POINT SINGULARITY
ANTIFERROMAGNETIC CORRELATIONS
CUPRATE SUPERCONDUCTORS
NORMAL-STATE
MODEL
BI2SR2CACU2O8+DELTA
YBA2CU3O6.9
LA2CUO4
EXCITATIONS
YBA2CU4O8
Аннотация: For the spin-fermion model, it has been shown that the concept of spin polarons makes it possible to reproduce fine details of the Fermi surface evolution in the nodal direction of La2-xSrxCuO4 occurring with changes in the doping level x. The physics here is determined by the spin-correlated hopping of charge carriers and by the doping dependence of the inverse magnetic correlation length. © 2013 Pleiades Publishing, Inc.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mankov Yu.I., Khlebopros R. G.
Заглавие : Effect of the shape of an antiferromagnetic nanoparticle on its magnetization
Место публикации : Tech. Phys.: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 57, Is. 5. - P.733-734. - ISSN 1063-7842, DOI 10.1134/S1063784212050209
Примечания : Cited References: 21
Предметные рубрики: DES GRAINS FINS
Аннотация: The dependence of the magnetization of an antiferromagnetic nanoparticle on its shape is studied in terms of a core-shell model. The magnetizations of a nanodisk, nanowire, and spherical particle are shown to differ several fold.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Zotov A. V., Solovev P. N.
Заглавие : Micromagnetic modeling of static and dynamic properties of ferromagnetic/antiferromagnetic bilayer
Коллективы : International Siberian Conference on Control and Communications
Место публикации : Int. Sib. Conf. on Control and Communicat.: Proc.: IEEE, 2013. - Conference code: 102462Cт. 6693573. - ISSN 978-1-4799-1060-1, DOI 10.1109/SIBCON.2013.6693573
Примечания : Cited References: 13
Предметные рубрики: EXCHANGE-BIAS
DEPENDENCE
Ключевые слова (''Своб.индексиров.''): absorption spectrum--exchange bias--micromagnetic modeling
Аннотация: Static and dynamic properties of ferromagnetic (F) antiferromagnetic (AF) bilayer have been studied by using micromagnetic calculations. The reasonable value of exchange bias field has been obtained. In addition, we have shown the strong dependence of a resonance frequency F/AF structure on an angle between an external magnetic field and an easy axis of the bilayer.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Zlotnikov A. O.
Заглавие : Effect of pressure on antiferromagnetic and superconducting ordering in systems with heavy fermions
Коллективы : International Interdisciplinary Symposium “Ordering in Minerals and Alloys” (14th; 8 -13 Sept. 2011; Rostov-on-Don)
Место публикации : Bull. Russ. Acad. Sci.: Phys.: Allerton Press, 2012. - Vol. 76, Is. 7. - P.733-736. - ISSN 0022-2860, DOI 10.3103/S1062873812070362
Примечания : Cited References: 7. - This work was supported by the Department of Physical Sciences, Russian Academy of Sciences (the Strong Electron Correlations Program); the Russian Foundation for Basic Research, projects nos. 100200251 and 110200741; the RFBR Sibir’, project no. 110298007; and by the federal target program Scientific and Pedagogical Personnel of an Innovative Russia, 2009–2013.
Ключевые слова (''Своб.индексиров.''): antiferromagnetic orderings--antiferromagnetic orders--antiferromagnetic phasis--antiferromagnetics--cooper instability--effect of pressure--external pressures--heavy fermion--impurity level--localized state--periodic anderson model--seed energy--spin moments--superconducting ordering--superexchange interaction--superconductivity--antiferromagnetism
Аннотация: Characteristics of the superconducting and antiferromagnetic phases of heavy-fermion intermet-allides are described within a periodic Anderson model with allowance for the superexchange interaction between spin moments of the localized states. It is shown that an external pressure that changes the seed energy of an impurity level can rapidly destroy the long-range antiferromagnetic order. The development of the Cooper instability near such an order-disorder transition induces the experimentally observed state in which superconductivity coexists with the antiferromagnetic ordering. В© 2012 Allerton Press, Inc.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Men'shikov V. V., Rudenko V. V., Tugarinov V. I., Vorotynov A. M., Ovchinnikov S. G.
Заглавие : Uniaxial magnetic anisotropy of rhombohedral CoCO3 crystals at T = 0 K
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2014. - Vol. 56, Is. 3. - P.468-472. - ISSN 1063-7834, DOI 10.1134/S1063783414030196. - ISSN 1090-6460
Примечания : Cited References: 21
Предметные рубрики: ANTIFERROMAGNETIC RESONANCE
IONS
Аннотация: A method for calculating the contribution of exchange interaction to uniaxial anisotropy with the use of g' factors has been worked out using CoCO3 crystals as an example. The calculated contribution of dipole-dipole interactions to the anisotropy of CoCO3 is 0.93 cm(-1). The sum of the contributions to the anisotropy constant of CoCO3 with the inclusion of the dipole-dipole interactions is 36.1 cm(-1).
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Dzebisashvili D. M., Barabanov A. F.
Заглавие : Effect of the concentration-dependent spin-charge correlations on the evolution of the energy structure of the 2D Emery model
Коллективы : Presidium of the Russian Academy of Sciences; Russian Foundation for Basic Research [13-02-00909, 13-02-00523, 13-02-98013_r-sibir]; Dynasty foundation
Место публикации : J. Exp. Theor. Phys.: MAIK Nauka-Interperiodica / Springer, 2014. - Vol. 118, Is. 6. - P.959-970. - ISSN 1063-7761, DOI 10.1134/S1063776114060223. - ISSN 1090-6509
Примечания : Cited References: 48. - This work was supported by the program "Quantum Physics of Mesoscopic and Disordered Systems" of the Presidium of the Russian Academy of Sciences, the Russian Foundation for Basic Research (project nos. 13-02-00909, 13-02-00523, and 13-02-98013_r-sibir), and the Dynasty foundation.
Предметные рубрики: SADDLE-POINT SINGULARITY
CUPRATE SUPERCONDUCTORS
FERMI-SURFACE
ANTIFERROMAGNETIC CORRELATIONS
NORMAL-STATE
Bi2Sr2CaCu2O8+δ
EXCITATIONS
YBa2Cu3O6.9
La2CuO4
YBa2Cu4O8
Аннотация: It is shown using the 2D Emery model that the strong coupling between the spin subsystem of copper ions in the singlet state and the subsystem of oxygen holes considerably reduces the spectral intensity of the correlation function for holes on the Fermi contour. Spin-charge correlations are manifested in the existence of two channels. The first channel is due to the p-d exchange coupling of spins of the oxygen and copper holes. The second channel appears as a result of spin-correlated hoppings, when the motion of holes over oxygen ions is accompanied by spin-flip processes (i.e., simultaneous changes in the spin projections of an oxygen hole and a copper ion). It is established as a result of self-consistent calculations that the allowance for the concentration dependence of spin correlators and multicenter spin-charge correlators appearing in the dispersion equation ensures a decrease in the energy of the system and considerably affects the evolution of the Fermi surface under hole doping.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Krasikov A. A., Dubrovskii A. A., Semenov S. V., Bayukov O. A., Stolyar S. V., Iskhakov R. S., Ladygina V. P., Ishchenko L. A.
Заглавие : Magnetic properties and the mechanism of formation of the uncompensated magnetic moment of antiferromagnetic ferrihydrite nanoparticles of a bacterial origin
Коллективы : Ministry of Education and Science of the Russian Federation; Siberian Branch of the Russian Academy of Sciences
Место публикации : J. Exp. Theor. Phys.: Pleiades Publishing, 2014. - Vol. 119, Is. 3. - P.479-487. - ISSN 1063-7761, DOI 10.1134/S1063776114080044. - ISSN 1090-6509
Примечания : Cited References: 42. - This work was supported by the Ministry of Education and Science of the Russian Federation (state contract in 2014-2016) and a program of the Siberian Branch of the Russian Academy of Sciences.
Предметные рубрики: NIO NANOPARTICLES
EXCHANGE BIAS
HYSTERESIS ANOMALIES
FERRITIN
SURFACE
MOSSBAUER
ORDER
SIZE
Аннотация: The magnetic properties of the superparamagnetic ferrihydrite nanoparticles that form as a result of the vital activity of Klebsiella oxytoca bacteria are studied. Both an initial powder with an average number of iron atoms N Fe ∼ 2000–2500 in a particle and this powder after annealing at 140°C for 3 h in air are investigated. The following substantial modifications of the magnetic properties of the ferrihydrite nanoparticles are detected after annealing: the superparamagnetic blocking temperature increases from 23 to 49.5 K, and the average magnetic moment of a particle increases (as follows from the results of processing of magnetization curves). The particles have antiferromagnetic ordering, and the magnetic moment resulting in the superparamagnetism of the system appears due to random spin decompensation inside the particle. For this mechanism, the number of uncompensated spins is proportional to the number of magnetically active atoms raised to the one-half power, and this relation holds true for the samples under study at a good accuracy. The possible causes of the detected shift of magnetic hysteresis loops at low temperatures upon field cooling are discussed.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Rudenko V. V.
Заглавие : Anisotropic interactions in magnetic crystals with S-state ions. Nanostructures
Коллективы : Program of Federal Support for Leading Scientific Schools of the Russian Federation [NSh 1044.2012.2], President's Program of Support for Leading Scientific Schools [NSh-2886.2014.2], Russian Foundation for Basic Research [13-02-00358]
Место публикации : Phys. Usp.: Turpion, 2014. - Vol. 57, Is. 12. - P.1180-1198. - ISSN 1063, DOI 10.3367/UFNe.0184.201412b.1299. - ISSN 14684780(eISSN). - ISSN
Примечания : Cited References:97. - We are grateful to L M Rudenko, T V Spirina, and N V Veretennikova for the assistance in the preparation of this review. This study was supported in part by the Program of Federal Support for Leading Scientific Schools of the Russian Federation (project No. NSh 1044.2012.2); by the President's Program of Support for Leading Scientific Schools (project No. NSh-2886.2014.2); and by the Russian Foundation for Basic Research (project No. 13-02-00358).
Предметные рубрики: PARAMAGNETIC-RESONANCE
ANTIFERROMAGNETIC-RESONANCE
EXCHANGE
Аннотация: Anisotropy mechanisms in compounds with S-state ions are discussed, including the 'single-ion' exchange mechanism that was developed theoretically by Nikiforov and coworkers based on the two-ion model and which has only recently received detailed experimental study. Results demonstrating the significant role of the 'single-ion' source are presented. An independent generalized method for quantitatively describing and predicting the anisotropy of magnetically ordered crystals is discussed, and its potential for the investigation of the BiFeO3 multiferroic in the region of the existence of a spin cycloid is examined. The anisotropic interactions responsible for the formation of nanostructures in the form of spin vortices (skyrmions) in MnSi and Cu2OSeO3 are analyzed.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kobets M. I., Dergachev K. G., Khatsko E. N., Gnatchenko S. L., Bezmaternykh L. N., Gudim, I. A.
Заглавие : Antiferromagnetic resonance study of the magnetic structure of Nd0.75Dy0.25Fe3(BO3)(4)
Место публикации : Low Temp. Phys.: American Institute of Physics, 2014. - Vol. 40, Is. 7. - P.629-634. - ISSN 1063-777X, DOI 10.1063/1.4890992. - ISSN 1090-6517
Примечания : Cited References: 17
Аннотация: The effect of replacing Nd3+ ions with Dy3+ ions on the resonance properties of Nd0.75Dy0.25Fe3(BO3)(4) is studied. The antiferromagnetic resonance (AFMR) method is used to detect an easy axis-easy plane magnetic spin-reorientation phase transition owing to competing exchange interactions of Nd-Fe and Dy-Fe, and the frequency-field dependence of the AFMR spectrum before and after the phase transition is studied. At 4.2 K, the detected resonance spectra in the H parallel to c direction are AFMR modes of iron, and their frequency-field dependences correspond to easy-axis (H 15 kOe) and easy-plane (H 16 kOe) magnetic structures with magnon excitation energy gaps of 77.2 and 100.3 GHz, respectively. The effective magnetic anisotropies responsible for these gaps are 0.7 and 1.2 kOe, respectively. Substitution by Dy3+ ions in crystalline Nd0.75Dy0.25Fe3(BO3)(4) in the paramagnetic region produces an additional static internal field owing to polarization, which leads to a shift in the resonance field of the EPR absorption line and a change in the g-factor of the Fe3+ ions. (C) 2014 AIP Publishing LLC.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bedarev V. A., Paschenko M. I., Kobets M. I., Dergachev K. G., Paschenko V. A., Bludov A. N., Khatsko E. N., Gnatchenko S. L., Bezmaternykh L. N., Temerov V. L.
Заглавие : Magnetoresonance properties of antiferromagnetic TbFe3( BO3)(4) at low temperatures
Место публикации : Low Temp. Phys.: American Institute of Physics, 2013. - Vol. 39, Is. 2. - P.167-171. - ISSN 1063-777X, DOI 10.1063/1.4792134; \b Физика низких температур
Примечания : Cited References: 11
Аннотация: The magnetic resonance and field dependence of magnetization were studied in a single crystal of TbFe3(BO3)(4) at temperatures from 2 to 13K and frequencies from 18 to 142 GHz. Two pairs of lines with different intensities were found in the EPR spectrum. The found lines can be assigned to two types of centers: the Tb3+ ions which neighbor with the Bi and Mo growth impurities. The initial splitting of the lowest quasi-doublet of such Tb3+ ions by the crystal field and exchange field acting on the rare-earth ions from the iron sublattices were determined. The amount of these centers was estimated. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4792134]
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Boldyrev K. N., Pisarev R. V., Bezmaternykh L. N., Popova M. N.
Заглавие : Antiferromagnetic dichroism in a complex multisublattice magnetoelectric CuB2O4
Коллективы : 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]
Место публикации : Phys. Rev. Lett.: American Physical Society, 2015. - Vol. 114, Is. 24. - Ст.247210. - ISSN 0031, DOI 10.1103/PhysRevLett.114.247210. - ISSN 10797114(eISSN)
Примечания : 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.).
Предметные 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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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Zlotnikov A. O., Val’kova T. A.
Заглавие : Effective temperature scattering matrix and kinematic mechanism of cooper instability in antiferromagnetic rare-earth intermetallides
Место публикации : Bull. Russ. Acad. Sci. Phys.: Allerton Press, 2015. - Vol. 79, Is. 6. - P.746-748. - ISSN 1062-8738, DOI 10.3103/S1062873815060349
Примечания : Cited References: 22. - This work was supported by the Presidium of the Russian Academy of Sciences, program no. 20.7; by the Russian Foundation for Basic Research, project no. 13-02-00523; and by regional grant Siberia 13-02-98013.A.O. Zlotnikov acknowledges the support of RF Presidential Grant no. SP-1370.2015.5.
Аннотация: An effective temperature-dependent scattering matrix for a localized subsystem is obtained in the periodic Anderson model by summing itinerant variables in the diagrammatic series of perturbation theory. The effective interaction that occurs in this case can lead to an antiferromagnetic phase, a superconducting phase, and the phase of coexisting superconductivity and antiferromagnetism observed in heavy-fermion intermetallic compounds. © 2015, Allerton Press, Inc.
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