Библиотека института физики им. Л.В. Киренского СО РАН

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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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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 (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Edelman I. S., Ivanova O. S., Ivantsov R. D., Velikanov D. A., Petrakovskaja E. A., Artemenko A., Curely J., Kliava J., Zaikovskiy V. I., Stepanov S.
Заглавие : Magnetic properties and morphology of manganese ferrite nanoparticles in glasses
Коллективы : Baltic Conference on Silicate Materials
Место публикации : IOP Conf. Ser.: Mater. Sci. Eng. - 2011. - Vol. 25, Is. 1. - Ст.012017. - , DOI 10.1088/1757-899X/25/1/012017
Ключевые слова (''Своб.индексиров.''): average diameter--borate glass--co-doped--electron magnetic resonance--magnetic and magneto-optical properties--magnetic behaviour--magnetic circular dichroisms--magnetic nanoparticles--magnetically ordered material--manganese ferrite nanoparticles--manganese ferrites--morphological characteristic--paramagnetic ions--resonance field--size and shape--static magnetization--temperature dependence--temperature dependent--variable temperature--visible and near infrared--alumina--dichroism--ferrite--glass--iron oxides--magnetic properties--magnetic resonance--magnetocrystalline anisotropy--manganese--manganese oxide--nanoparticles--paramagnetism--silicates--spectroscopy--nanomagnetics
Аннотация: Static magnetization (SM), magnetic circular dichroism (MCD) and electron magnetic resonance (EMR) studies are reported of borate glasses 22.5 K 2O-22.5 Al 2O 3-55 B 2O 3 co-doped with iron and manganese oxides. In as-prepared glasses the paramagnetic ions usually are in diluted state; however, if the ratio of the iron and manganese oxides in the charge is 3/2, magnetic nanoparticles are found already in as-prepared glass. After additional thermal treatment all glasses show magnetic behaviour, MCD and EMR due to the presence of magnetic nanoparticles with characteristics close to those of manganese ferrite. By computer simulating the EMR spectra at variable temperatures, their morphological characteristics are deduced: relatively broad size and shape distribution with average diameter of ca. 3-4 nm. The characteristic temperature-dependent shift of the apparent resonance field is explained by a strong temperature dependence of the magnetocrystalline anisotropy in the nanoparticles. The potassium-alumina-borate glasses containing magnetic nanoparticles represent a novel class of materials: "transparent magnets". Indeed, they remain transparent in a part of visible and near infrared spectral range while showing magnetic and magneto-optical properties characteristic of magnetically ordered materials.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrov M. I., Balaev D. A., Shaikhutdinov K. A., Aleksandrov K. S.
Заглавие : A comparative study of transport properties of composites HTSC+MgTiO3 and HTSC + NiTiO3. The effect of paramagnetic NiTiO3
Коллективы : International conference on materials and mechanisms of superconductivity high temperature superconductors
Место публикации : Physica C-Superconductivity and its Applications. - 2000. - Vol. 341-348, Pt. 3. - P.1863-1864. - ISSN 0921-4534, DOI 10.1016/S0921-4534(00)01217-X
Ключевые слова (''Своб.индексиров.''): composite materials--copper oxides--josephson junction devices--magnesium compounds--nickel compounds--paramagnetism--superconductivity--thermal effects--transport properties--yttrium compounds--abrikosov vortices flow--superconductor insulator superconductor junction--thermally activated phase slippage--high temperature superconductors
Аннотация: Bulk composites Y3/4Lu1/4Ba2Cu3O7+NiTiO3 and Y3/4Lu1/4Ba2Cu3O7+MgTiO3 with insulator volume content 7.5% and 15% modelling a network of Superconductor-Insulator-Superconductor (S-I-S) junctions have been prepared. The ?(T) dependences of composites HTSC+MgTiO3 are described well by the mechanism of Thermally Activated Phase Slippage (TAPS). The anomalous behavior of resistivity ?(T) of HTSC+NiTiO3 composites manifesting as a kink on ?(T) curves at some temperature Tm have been observed. In the temperature range Tm < T < TC the dissipation is Ohmic while below Tm the CVCs are strongly non-linear. This peculiarity is interpreted as arisen owing to Abrikosov vortices flow.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Li, Oksana A., Lin, Chun-Rong, Chen, Hung-Yi, Hsu, Hua-Shu, Wu, Kai-Wun, Tseng, Yaw-Teng, Bayukov O. A., Edelman I. S., Ovchinnikov S. G., Shih, Kun-Yauh
Заглавие : Structural and magnetic properties of Fe1−xCoxSe1.09 nanoparticles obtained by thermal decomposition
Место публикации : Mater. Res. Express: IOP Publishing, 2015. - Vol. 2, No. 12. - Ст.126501. - ISSN 2053-1591, DOI 10.1088/2053-1591/2/12/126501
Примечания : Cited References: 30. - This work is supported by the Ministry of Science and Technology of Taiwan (MOST103-2811-M-153 -001 and MOST102-2112-M-153 -002 -MY3).
Предметные рубрики: X-RAY-DIFFRACTION
MOSSBAUER-SPECTROSCOPY
CRYSTAL-STRUCTURES
IRON SELENIDES
SUPERCONDUCTIVITY
FeSe
MARCASITE
PYRITE
Ключевые слова (''Своб.индексиров.''): nanoparticles--chalcogenide--iron-cobalt selenide--ferrimagnetism--paramagnetism--mossbauer spectroscopy
Аннотация: A series of Fe1−xCoxSe1.09 (x = 0 to ) nanoparticles were synthesized by thermal decomposition method. Particles in composition range Fe0.5Co0.5Se1.09 to CoSe1.09 crystallized in monoclinic structure of Co6.8Se8 , while FeSe1.09 crystallized in hexagonal structure of FeSe achavalite. Magnetization dependences on temperature and external magnetic field reveal complicated magnetic behavior and correspond to the sum of paramagnetic and superparamagnetic response. Mössbauer spectra contain several paramagnetic doublets with parameters corresponding to nonequivalent positions of divalent and trivalent iron cations with low spin. The nonequivalent positions appeared due to inhomogeneous distribution of Co ions or metal vacancies in iron surrounding.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavrichkov V. A., Ovchinnikov S. G., Nekrasov I. A., Pchelkina Z. V.
Заглавие : Electronic Structure of p-Type La1-xMx2+MnO3 Manganites in the Ferromagnetic and Paramagnetic Phases in the LDA plus GTB Approach
Разночтения заглавия :авие SCOPUS: Electronic structure of p-Type La 1-x M x 2+ MnO 3 manganites in the ferromagnetic and paramagnetic phases in the LDA + GTB approach
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 112, Is. 5. - P860-876. - ISSN 1063-7761, DOI 10.1134/S1063776111030101
Примечания : Cited References: 47. - This study was supported financially by integration project no. 40 of the Ural and Siberian Branches of the Russian Academy of Sciences, the program "Strong Electron Correlations" of the Russian Academy of Sciences, and the Russian Foundation for Basic Research (project no. 10-02-00251-a).
Предметные рубрики: DOUBLE-EXCHANGE
COLOSSAL MAGNETORESISTANCE
THIN-FILMS
PHYSICS
LA1-XSRXMNO3
RESISTIVITY
SEPARATION
TRANSPORT
MODEL
Ключевые слова (''Своб.индексиров.''): complex structure--cubic materials--ferromagnetic phase--half metals--jahn teller effect--metal properties--metal types--orbitals--p-type--paramagnetic phase--paramagnetic phasis--quasi particles--spectral intensity--spin projections--strong electron correlations--barium--density functional theory--electron correlations--electron density measurement--electronic properties--electronic structure--fermi level--ferromagnetic materials--ferromagnetism--manganese oxide--manganites--paramagnetic materials--paramagnetism--valence bands--lanthanum
Аннотация: The band structure, spectral intensity, and position of the Fermi level in doped p-type La1-xMx2+ MnO3 manganites (M = Sr, Ca, Ba) is analyzed using the LDA + GBT method for calculating the electronic structure of systems with strong electron correlations, taking into account antiferro-orbital ordering and using the Kugel-Khomskii ideas and real spin S = 2. The results of the ferromagnetic phase reproduce the state of a spin half-metal with 100% spin polarization at T = 0, when the spectrum is of the metal type for a quasiparticle with one spin projection and of the dielectric type for the other. It is found that the valence band becomes approximately three times narrower upon a transition to the paramagnetic phase. For the paramagnetic phase, metal properties are observed because the Fermi level is located in the valence band for any nonzero x. The dielectrization effect at the Curie temperature is possible and must be accompanied by filling of d(x) orbitals upon doping. The effect itself is associated with strong electron correlations, and a complex structure of the top of the valence band is due to the Jahn-Teller effect in cubic materials. DOI: 10.1134/S1063776111030101
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shaykhutdinov K. A., Popkov S. I., Semenov S. V., Balaev D. A., Dubrovskiy A. A., Sablina K. A., Sapronova N. V., Volkov N. V.
Заглавие : Low-temperature resistance and magnetoresistance hysteresis in polycrystalline (La0.5Eu0.5)(0.7)Pb0.3MnO3
Разночтения заглавия :авие SCOPUS: Low-temperature resistance and magnetoresistance hysteresis in polycrystalline (La0.5Eu0.5)0.7Pb 0.3MnO3
Место публикации : J. Appl. Phys.: AMER INST PHYSICS, 2011. - Vol. 109, Is. 5. - Ст.53711. - ISSN 0021-8979, DOI 10.1063/1.3559303
Примечания : Cited References: 20. - This study was partially supported by the Russian Foundation for Basic Research, Project No. 08-02-00259a and the Lavrentyev Competition of the Young Scientists' Projects of the Siberian Branch of the Russian Academy of Sciences, Project No. 12.
Предметные рубрики: RESISTIVITY MINIMUM
MANGANITES
FILMS
Ключевые слова (''Своб.индексиров.''): antiferromagnets--electrical resistances--ferromagnets--field dependence--inter-grain--lanthanum manganites--low temperatures--low-temperature resistance--polycrystalline--temperature dependence--tunnel contacts--antiferromagnetic materials--europium--ferromagnetic materials--ferromagnetism--hysteresis--lead--magnetic field effects--magnetoelectronics--magnetoresistance--magnets--manganese oxide--paramagnetism--superconducting materials--electric resistance
Аннотация: The behavior of temperature dependences of electrical resistance and magnetoresistance of polycrystalline substituted lanthanum manganite (La0.5Eu0.5)(0.7)Pb0.3MnO3 at low temperatures was thoroughly studied. A broad hysteresis was found in the field dependences of electrical resistance in the low-temperature region. Above 40 K, no hysteresis feature was observed. The temperature T = 40 K corresponds to the temperature of minimum electrical resistance and the temperature T-N to the antiferromagnet-paramagnet phase transition of the material of the intergrain boundaries. In this work we propose a model which explains the observed features of the rho(T) and rho(H) curves at temperatures below T-N by the formation of a network of ferromagnet-antiferromagnet-ferromagnet tunnel contacts. (C) 2011 American Institute of Physics. [doi:10.1063/1.3559303]
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Dyakonov V. P., Szymczak R., Prokhorov A. D., Zubov E., Prokhorov A. A., Petrakovskii G. A., Bezmaternykh L. N., Berkowski M., Varyukhin V., Szymczak H.
Заглавие : Magnetic and EPR studies of the EuFe3(BO3)(4) single crystal
Коллективы :
Разночтения заглавия :авие SCOPUS: Magnetic and EPR studies of the EuFe 3(BO 3) 4 single crystal
Место публикации : Eur. Phys. J. B: SPRINGER, 2010. - Vol. 78, Is. 3. - P291-298. - ISSN 1434-6028, DOI 10.1140/epjb/e2010-10059-3
Примечания : Cited References: 23. - A.A. Prokhorov is grateful to Mianowski Fund for financial support.
Предметные рубрики: EARTH
GDFE3(BO3)(4)
MULTIFERROICS
Ключевые слова (''Своб.индексиров.''): absorption lines--antiferromagnetic orderings--applied magnetic fields--basal planes--easy direction of magnetizations--electron paramagnetic resonance--epr measurements--epr spectra--epr studies--europium ions--exchange fields--g factors--lorentz--magnetic measurements--magnetic subsystems--orientation dependence--sub-lattices--temperature dependence--temperature range--trigonal symmetry--zeeman effect--antiferromagnetism--crystal orientation--europium--magnetic fields--magnetic moments--magnetic variables measurement--magnetization--paramagnetic resonance--paramagnetism--single crystals--spectroscopy--electron spin resonance spectroscopy
Аннотация: Magnetic and electron paramagnetic resonance (EPR) properties of EuFe3(BO3)(4) single crystals have been studied over the temperature range of 300-4.2 K and in a magnetic field up to 5 T. The temperature, field and orientation dependences of susceptibility, magnetization and EPR spectra are presented. An antiferromagnetic ordering of the Fe subsystem occurs at about 37 K. The easy direction of magnetization perpendicular to the c axis is determined by magnetic measurements. Below 10 K, we observe an increase of susceptibility connected with the polarization of the Eu sublattice by an effective exchange field of the ordered Fe magnetic subsystem. In a magnetic field perpendicular to the c axis, we have observed an increase of magnetization at T 10 K in the applied magnetic field, which can be attributed to the appearance of the magnetic moment induced by the magnetic field applied in the basal plane. According to EPR measurements, the distance between the maximum and minimum of derivative of absorption line of the Lorentz type is equal to 319 Gs. The anisotropy of g-factor and linewidth is due to the influence of crystalline field of trigonal symmetry. The peculiarities of temperature dependence of both intensity and linewidth are caused by the influence of excited states of europium ion (Eu3+). It is supposed that the difference between the g-factors from EPR and the magnetic measurements is caused by exchange interaction between rare earth and Fe subsystems via anomalous Zeeman effect.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Abramova G. M., Pankrats A. I., Petrakovskii G. A., Rasch JCE, Boehm M., Vorotynov A. M., Tugarinov V. I., Szumszak R., Bovina A. F., Vasil'ev V.
Заглавие : Electron spin resonance in CuCrS(2) chrome-copper disulphides synthesized by different methods
Разночтения заглавия :авие SCOPUS: Electron spin resonance in CuCrS 2 chrome-copper disulphides synthesized by different methods
Место публикации : J. Appl. Phys.: AMER INST PHYSICS, 2010. - Vol. 107, Is. 9. - Ст.93914. - ISSN 0021-8979, DOI 10.1063/1.3374679
Примечания : Cited References: 13
Предметные рубрики: COLOSSAL MAGNETORESISTANCE
PHYSICAL-PROPERTIES
TRANSITION
Ключевые слова (''Своб.индексиров.''): chemical vapor transport--electron spin resonance--ferromagnets--g-values--magnetic transitions--polycrystalline--synthesis method--temperature range--astatine--paramagnetism--resonance--single crystals--spin dynamics--crystal impurities
Аннотация: The electron spin resonance (ESR) in CuCrS(2) disulphides is found to be strongly dependent on a synthesis method used. At a temperature of 300 K, a polycrystalline CuCrS(2) sample is paramagnetic with a g-value of 1.95 at 40 K, it undergoes the magnetic transition. In the temperature range 4.2-290 K, a single-crystal sample prepared by a chemical vapor transport method exhibits the ESR features typical of a ferromagnet. It is shown that these features are related to the presence of a small amount of the single-crystal CuCr(2)S(4) impurity in the CuCrS(2) single crystal. (C) 2010 American Institute of Physics. [doi:10.1063/1.3374679]
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pisarev R. V., Sanger I., Petrakovskii G. A., Fiebig M.
Заглавие : Magnetic-field induced second harmonic generation in CuB2O4
Разночтения заглавия :авие SCOPUS: Magnetic-field induced second harmonic generation in CuB2O 4
Место публикации : Phys. Rev. Lett.: AMER PHYSICAL SOC, 2004. - Vol. 93, Is. 3. - Ст.37204. - ISSN 0031-9007, DOI 10.1103/PhysRevLett.93.037204
Примечания : Cited References: 28
Предметные рубрики: COPPER METABORATE
PHASE
CR2O3
Ключевые слова (''Своб.индексиров.''): antiferromagnetic materials--crystal structure--energy gap--magnetic moments--magnetization--monochromators--nonlinear optics--paramagnetism--phase diagrams--polarization--second harmonic generation--single crystals--electric-field induced second harmonic (efish)--magnetic structure--magnetic-field induced second harmonic (mfish)--phonon transitions--copper compounds
Аннотация: Three types of optical magnetic-field induced second harmonic (MFISH) generation are observed in CuB2O4. Unusually sharp and intense electronic transitions in MFISH and linear absorption spectra provide selective access to the two nonequivalent Cu2+ sublattices. The magnetic phase diagram for both sublattices is determined by MFISH. Magnetic structure is dominated by antiferromagnetic order at the 4b site. Sublattice interactions transfer it to the 8d site where it coexists with a discoupled paramagnetic component.
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