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1.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Ivanova N. B., Platunov M. S., Knyazev Yu. V., Kazak N. V., Bezmaternykh L. N., Eremin E. V., Vasiliev A. D.
Заглавие
: Spin-glass magnetic ordering in CoMgGaO2BO3 ludwigite
Место публикации
: Физ. низких температур: Физико-технический институт низких температур им. Б.И. Веркина НАН Украины, 2012. - Т. 38, Вып. 2. - С.214-217. - ISSN 0132-6414. - ISSN 1816-0328
Примечания
: Библиогр.: 13 назв. - This work was supported by the Russian Foundation for Basic Research (project No. 09-02-00171-a), the Federal Agency for Science and Innovation (Rosnauka) (project No. MK-5632.2010.2), the Physics Division of the Russian Academy of Sciences, the program "Strongly Correlated Electrons" (project 2.3.1).
Предметные рубрики:
AC Magnetic
susceptibility
DC magnetization
Field cooled
Flux methods
Frequency dependent
Magnetic system
Magnetic transitions
Needle shape
Parent compounds
Spin-glasses freezing
Temperature dependencies
Unit-cell volume
Zero-field-cooled
Cobalt
Cobalt compounds
Freezing
Glass
Magnetic
susceptibility
Magnetism
Single crystals
X-ray diffraction
Spin glass
Ключевые слова
(''Своб.индексиров.''): spin-glass freezing--transition metal ludwigites
Аннотация:
The single crystal needle shape samples of diamagnetically diluted cobalt ludwigite CoMgGaO2BO3 have been grown by the flux method. The results of x-ray diffraction and both dc and ac magnetic measurements are presented. The unit cell volume undergoes a noticable growth under dilution from 328.31 Å3 for the parent compound Co3O2BO3 to 345.46 Å3 for CoMgGaO2BO3. The temperature of magnetic transition is considerably lower for the latter compound (25 K against 43 Kfor Co3O2BO3). The dc magnetization temperature dependencies undergo the splitting of field cooled and zero-field cooled regimes and the ac magnetic
susceptibility
temperature dependencies are frequency dependent pointing out a possible spin-glass freezing in the magnetic system.
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2.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Arkhipkin V. G., Myslivets S. A.
Заглавие
: All-optical switching in a photonic crystal with a defect containing an N-type four-level atomic system
Место публикации
: Phys. Rev. A: American Physical Society, 2012. - Vol. 86, Is. 6. - Ст.063816. - ISSN 1050-2947,
DOI
10.1103/PhysRevA.86.063816
Примечания
: Cited References: 33. - This work was supported in part by the RAS Grants No. 24.29, No. 24.31, and No. 3.9.5, and SB RAS Grants No. 43 and No. 101.
Предметные рубрики:
Electromagnetically-induced-transparency
Quantum interference
Microcavities
All-optical switching
Atomic medium
Cross-phase modulations
Defect mode
Electromagnetically induced transparency
Four-level atomic system
Kerr nonlinearity
Laser fields
Linear
susceptibility
One dimensional photonic crystal
Probe field
Quantum interference
Resonance frequencies
Third-order
susceptibility
Transmission spectrums
Two photon
Аннотация:
We study the transmission spectra of a one-dimensional photonic crystal with a defect containing a four-level atomic medium that exhibits a greatly enhanced third-order
susceptibility
while having a vanishing linear
susceptibility
dependent on the electromagnetically induced transparency. Two ways of controlling the transmission of a photonic crystal are discussed: via absorption, i.e., nonlinear (two-photon) absorption of the probe field enhanced by constructive quantum interference, and via dispersion, which comes down to shifting the resonance frequency of the defect mode for the probe field by varying the refractive index based on the giant Kerr nonlinearity (cross-phase modulation). We demonstrate that such systems enable nonlinear all-optical switching at ultralow intensities of the coupling and switching laser fields.
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3.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Korshunov M. M., Togushova Yu. N., Eremin I.
Заглавие
: Three-orbital model for Fe-pnictides
Место публикации
: J. Supercond. Nov. Magn. - 2013. - Vol. 26, Is. 8. - P.2665-2668. - ISSN 1557-1939,
DOI
10.1007/s10948-013-2156-x
Ключевые слова
(''Своб.индексиров.''): fe-based superconductors--low-energy model--spin
susceptibility
--fe-based superconductors--iron-based superconductors--pairing interactions--spin
susceptibility
--high temperature superconductors--magnetic
susceptibility
--superconductivity
Аннотация:
We formulate and study the three-orbital model for iron-based superconductors. Results for the band structure, Fermi surface, and the spin
susceptibility
in both normal and superconducting s В± states are presented. We also discuss the pairing interaction and show that the dominant part of it should come from the intraorbital scattering. В© 2013 Springer Science+Business Media New York.
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4.
Вид документа
: Статья из журнала
Шифр издания
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Автор(ы)
: Aplesnin S. S., Udod L. V., Sitnicov M. N., Velikanov D. A.
Заглавие
: Magnetic and resonance properties of Bi24(CoBi)O40
Место публикации
: J. Korean Phys. Soc. - 2013. - Vol. 63, Is. 3. - P.293-295. - ISSN 0374-4884,
DOI
10.3938/jkps.63.293
Ключевые слова
(''Своб.индексиров.''): curie-weiss law--g-factor--magnetic
susceptibility
--paramagnetic neel temperature
Аннотация:
Temperature and field dependences of the magnetic moment in the temperature range 4 K < T < 300 K and electron spin resonance linewidths and the g-factor in the temperature range 80 K < T < 300 K for the Bi24(CoBi)O40 compound synthesized by the solid-state reaction are analyzed. The magnetic
susceptibility
of Bi24(CoBi)O40 within the range 4 K < T < 300 K is described well by the Curie-Weiss law with the negative paramagnetic Curie temperature ? = -12.3 K and the effective magnetic moment ? = 5.08?B. The g-factor and the ESR linewidth grow with temperature. В© 2013 The Korean Physical Society.
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5.
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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6.
Вид документа
: Статья из сборника (однотомник)
Шифр издания
:
Автор(ы)
: Ignatchenko V. A., Polukhin D. S.
Заглавие
: Spin and elastic waves with the random coupling parameter
Коллективы
: Moscow International Symposium on Magnetism
Место публикации
: Diffusion and Defect Data Pt.B: Solid State Phenomena. - 2012. - Vol. 190. - P.51-54. - ISBN 1012-0394,
DOI
10.4028/www.scientific.net/SSP.190.51. - ISBN 9783037854365
Ключевые слова
(''Своб.индексиров.''): dynamic
susceptibility
--elastic waves--inhomogeneities--magnetoelastic coupling--self-consistent approximation--spin waves--anti-resonance--dispersion law--dynamic
susceptibility
--inhomogeneities--magnetoelastic couplings--magnetoelastic waves--narrow resonances--physical nature--random couplings--self-consistent approximation--wave numbers--wavefields--green's function--magnetic materials--magnetic
susceptibility
--spin waves--elastic waves
Аннотация:
Dynamic susceptibilities (Green's function) in a system of two wave fields of different physical nature connected by the zero-mean random coupling parameter are studied. Magnetoelastic waves in zero-mean magnetostrictive media are considered. It is shown that the Green's functions of the spin G? m(?) and elastic G? u(?) waves at the intersection of the initial dispersion laws have the form of broad single-mode peaks with the fine structure on the tops of these peaks: the narrow resonance on the top of G? m(?) and the narrow antiresonance on the top of G? u(?) For the longwave inhomogeneities the widths of the broad peaks and narrow peaks are determined by the rootmean- square fluctuation and the correlation wave number, respectively. В© (2012) Trans Tech Publications.
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7.
Вид документа
: Статья из сборника (однотомник)
Шифр издания
:
Автор(ы)
: Ignatchenko V. A., Pozdnyakov A. V.
Заглавие
: Spectral properties of superlattices with anisotropic inhomogeneities. The transition from 3D to 2D disorder
Коллективы
: Moscow International Symposium on Magnetism
Место публикации
: Diffusion and Defect Data Pt.B: Solid State Phenomena. - 2012. - Vol. 190. - P.597-600. - ISBN 1012-0394,
DOI
10.4028/www.scientific.net/SSP.190.597. - ISBN 9783037854365
Ключевые слова
(''Своб.индексиров.''): anisotropic inhomogeneities--dos--green function--superlattice--
susceptibility
--waves--anisotropic inhomogeneities--continuous transitions--correlation properties--density of state--dynamic
susceptibility
--inhomogeneities--spectral properties--wave numbers--dos--green's function--magnetic materials--magnetic
susceptibility
--superlattices--three dimensional--waves--anisotropy
Аннотация:
Waves in superlattice (SL) contained inhomogeneities with anisotropic correlation properties are considered. The anisotropy of the correlation during the transition from 3D to 2D disorder is characterized by the parameter ? 1 = k ||/k?-1, where k || and k? are the correlation wave numbers along the axis of the SL and in the plane of the its layers, respectively (r || =k || -1 and r?=k?-1 are the correlation radii). Dependencies of both the dynamic
susceptibility
and density of states at the continuous transition from the isotropic three-dimensional inhomogeneities (? 1 = 0) to the twodimensional ones (? 1 = -1) have been obtained. В© (2012) Trans Tech Publications.
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8.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Ignatchenko V. A., Tsikalov D. S.
Заглавие
: Spin-wave spectrum in the sinusoidal superlattice with amplitude and phase inhomogeneities
Коллективы
: Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism
Место публикации
: Solid State Phenom.: Selected, peer reviewed papers/ ed.: S. G. Ovchinnikov, A. Samardak: Trans Tech Publications, 2014. - Vol. 215: Trends in Magnetism: Nanomagnetism (EASTMAG-2013). - P.385-388. - ISSN 978-303835054-5,
DOI
10.4028/www.scientific.net/SSP.215.385. - ISSN 1662-9779
Примечания
: Cited References: 6
Ключевые слова
(''Своб.индексиров.''): dos--dynamic
susceptibility
--inhomogeneities--spin waves--superlattices
Аннотация:
Effects of both the phase and the amplitude inhomogeneities of different dimensionalities on the Green's function and on the one-dimensional density of states of spin waves in the sinusoidal superlattice have been studied. Processes of multiple scattering of waves from inhomogeneities have been taken into account in the self-consistent approximation. © (2014) Trans Tech Publications, Switzerland.
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9.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Pankrats A. I., Sablina K. A., Velikanov D. A., Bayukov O. A., Vorotynov A. M., Balaev A. D., Molokeev M. S., Kolkov M. I.
Заглавие
: Magnetic and dielectric properties of PbFeBO4 and PbMnBO4 single crystals
Коллективы
: Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism
Место публикации
: Solid State Phenom.: Selected, peer reviewed papers/ ed.: S. G. Ovchinnikov, A. Samardak: Trans Tech Publications, 2014. - Vol. 215: Trends in Magnetism: Nanomagnetism (EASTMAG-2013). - P.372-377. - ISSN 978-303835054-5,
DOI
10.4028/www.scientific.net/SSP.215.372. - ISSN 1662-9779
Примечания
: Cited References: 3. - This investigation was supported by the Russian Foundation for Basic Research (RFBR) (Grant No.13-02-00897).
Ключевые слова
(''Своб.индексиров.''): borate oxide--dielectric permittivity--magnetic
susceptibility
--single crystal--strong anisotropy
Аннотация:
PbFeBO4 and PbMnBO4 single crystals were synthesized. The X-ray, magnetic, dielectric, Mossbauer, and resonance investigations of the crystals were fulfilled. It is established that single-crystal PbFeBO4 is an antiferromagnet with a Neel temperature TN =114 K, while PbMnBO4 is a ferromagnet with a Curie temperature TC = 31 K. Both single-crystal compounds have a strong anisotropy of the magnetic and dielectric properties. © (2014) Trans Tech Publications, Switzerland.
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10.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Val'kov V. V., Shustin M. S.
Заглавие
: Radiation-induced modification of the temperature dependence of the magnetic
susceptibility
of a 1D magnet
Коллективы
: Russian Foundation for Basic Research [12-02-31130, 13-02-00523, 13-02-98013]
Место публикации
: JETP Letters. - 2014. - Vol. 100, Is. 7. - P.455-462. - ISSN 0021-3640,
DOI
10.1134/S0021364014190138. - ISSN 1090-6487
Примечания
: Cited References: 28. - This work was supported by the Russian Foundation for Basic Research, project nos. 12-02-31130, 13-02-00523, and 13-02-98013.
Предметные рубрики:
SINGLE-CHAIN MAGNETS
EASY-PLANE
ARRANGEMENT
MODEL
IONS
Аннотация:
TThe excitation spectrum of a catena-[FeII(ClO4)2{FeIII(bpca)2}]ClO4 anisotropic 1D magnet with alternating high-spin and low-spin iron ions has been calculated with the use of the diagrammatic technique for Hubbard operators. This has allowed establishing conformity with the Ising model, for which the magnetic
susceptibility
has been calculated by the transfer-matrix method. The introduction of a statistical ensemble taking into account the presence of chains with different lengths and iron ions with different spins has allowed describing the modification of the magnetic
susceptibility
under optical irradiation.
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11.
Вид документа
: Статья из сборника (однотомник)
Шифр издания
:
Автор(ы)
: Ignatchenko V. A., Pozdnyakov A. V.
Заглавие
: Spectral Properties of Superlattices with Anisotropic inhomogeneities. The Transition from 3D to 1D Disorder
Коллективы
: Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации
: TRENDS IN MAGNETISM. Ser. Solid State Phenomena/ Euro-Asian Symposium "Trends in MAGnetism": Nanospintronics (4 ; 2010 ; 28 June-2 July ; Ekaterinburg): TRANS TECH PUBLICATIONS LTD, 2011. - Vol. 168-169. - P.85-88. - ISBN 1012-0394,
DOI
10.4028/www.scientific.net/SSP.168-169.85
Примечания
: Cited References: 4
Ключевые слова
(''Своб.индексиров.''): superlattice--waves--anisotropic inhomogeneities--green's function--
susceptibility
--dos
Аннотация:
Waves in the superlattice (SL) contained inhomogeneities with anisotropic correlation properties are considered. The anisotropy of the correlations is characterized by the parameter lambda=1-k(perpendicular to)/k(parallel to), where k(parallel to) and k(perpendicular to) are the correlation wave numbers along the axis of the SL and in the plane of its layers, respectively (r(parallel to) = k(parallel to)(-1) and r(perpendicular to) = k(perpendicular to)(-1) are the correlation radii). Dependencies of both the dynamic
susceptibility
and density of states at the continuous transition from the isotropic three-dimensional inhomogeneities (lambda=0) to the one-dimensional ones (lambda=1) have been obtained.
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12.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Ignatchenko V. A., Pozdnyakov A. V.
Заглавие
: Spectral properties of superlattices with anisotropic inhomogeneities. The transition from 3D to 1D disorder
Коллективы
: Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации
: Diffusion and Defect Data Pt.B: Solid State Phenomena. - 2011. - Vol. 168-169. - P.85-88. - ISSN 1012-0394,
DOI
10.4028/www.scientific.net/SSP.168-169.85. - ISSN 9783037850213
Ключевые слова
(''Своб.индексиров.''): anisotropic inhomogeneities--dos--green's function--superlattice--
susceptibility
--waves--anisotropic inhomogeneities--continuous transitions--correlation properties--density of state--dynamic
susceptibility
--inhomogeneities--spectral properties--
susceptibility
--wave numbers--differential equations--magnetic
susceptibility
--superlattices--three dimensional--anisotropy
Аннотация:
Waves in the superlattice (SL) contained inhomogeneities with anisotropic correlation properties are considered. The anisotropy of the correlations is characterized by the parameter ? = 1-k? / k ?, where k ? and k? are the correlation wave numbers along the axis of the SL and in the plane of its layers, respectively (r ? k ?-1 and r? = k?-1 are the correlation radii). Dependencies of both the dynamic
susceptibility
and density of states at the continuous transition from the isotropic three-dimensional inhomogeneities (? = 0 ) to the one-dimensional ones (? =1) have been obtained.
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13.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Ignatchenko V. A., Tsikalov D. S.
Заглавие
: Spectral properties of waves in superlattices with 2D and 3D inhomogeneities
Место публикации
: Journal of Experimental and Theoretical Physics. - 2011. - Vol. 113, Is. 2. - P.232-244. - ISSN 1063-7761,
DOI
10.1134/S1063776111080061
Ключевые слова
(''Своб.индексиров.''): analytic expressions--brillouin zone boundary--density of state--dynamic
susceptibility
--inhomogeneities--one-dimensional density--optical methods--optical structures--peak height--root mean squares--spectral properties--superlattice layers--two phase--wave numbers--green's function--magnetic
susceptibility
--optical multilayers--phase interfaces--three dimensional--superlattices
Аннотация:
We investigate the dynamic
susceptibility
and one-dimensional density of states in an initially sinusoidal superlattice containing simultaneously 2D phase inhomogeneities simulating correlated rough-nesses of superlattice interfaces and 3D amplitude inhomogeneities of the superlattice layer materials. The analytic expression for the averaged Green's function of the sinusoidal superlattice with two phase inhomogeneities is derived in the Bourret approximation. It is shown that the effect of increasing asymmetry in the peak heights of dynamic
susceptibility
at the Brillouin zone boundary of the superlattice, which was discovered earlier [15] upon an increase in root-mean-square (rms) fluctuations, also takes place upon an increase in the correlation wavenumber of inhomogeneities. However, the peaks in this case also become closer, and the width and depth of the gap in the density of states decrease thereby. It is shown that the enhancement of rms fluctuations of 3D amplitude inhomogeneities in a superlattice containing 2D phase inhomogeneities suppresses the effect of dynamic
susceptibility
asymmetry and leads to a slight broadening of the gap in the density of states and a decrease in its depth. Targeted experiments aimed at detecting the effects studied here would facilitate the development of radio-spectroscopic and optical methods for identifying the presence of inhomogeneities of various dimensions in multilayer magnetic and optical structures. В© 2011 Pleiades Publishing, Ltd.
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14.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Ignatchenko V. A., Tsikalov D. S.
Заглавие
: Spectral properties of waves in superlattices with 2D and 3D inhomogeneities
Место публикации
: J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 113, Is. 2. - P.232-244. - ISSN 1063-7761,
DOI
10.1134/S1063776111080061
Примечания
: Cited References: 24. - This study was supported in part by the program of the Presidium of the Russian Academy of Sciences (grant no. 27.1), Federal Targeted Program (State contract no. 02.740.11.0220), and Targeted Programs "Development of the Higher School Scientific Potential" in 2009-2010 and 2011 years.
Предметные рубрики:
X-RAY REFLECTION
PERTURBED FIELDS
MULTILAYERS
SUSCEPTIBILITY
PROPAGATION
INTERFACES
SCATTERING
SYSTEM
Аннотация:
We investigate the dynamic
susceptibility
and one-dimensional density of states in an initially sinusoidal superlattice containing simultaneously 2D phase inhomogeneities simulating correlated rough-nesses of superlattice interfaces and 3D amplitude inhomogeneities of the superlattice layer materials. The analytic expression for the averaged Green's function of the sinusoidal superlattice with two phase inhomogeneities is derived in the Bourret approximation. It is shown that the effect of increasing asymmetry in the peak heights of dynamic
susceptibility
at the Brillouin zone boundary of the superlattice, which was discovered earlier [15] upon an increase in root-mean-square (rms) fluctuations, also takes place upon an increase in the correlation wavenumber of inhomogeneities. However, the peaks in this case also become closer, and the width and depth of the gap in the density of states decrease thereby. It is shown that the enhancement of rms fluctuations of 3D amplitude inhomogeneities in a superlattice containing 2D phase inhomogeneities suppresses the effect of dynamic
susceptibility
asymmetry and leads to a slight broadening of the gap in the density of states and a decrease in its depth. Targeted experiments aimed at detecting the effects studied here would facilitate the development of radio-spectroscopic and optical methods for identifying the presence of inhomogeneities of various dimensions in multilayer magnetic and optical structures.
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15.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Arauzo A., Kazak N. V., Ivanova N. B., Platunov M. S., Knyazev Yu. V., Bayukov O. A., Bezmaternykh L. N., Lyubutin I. S., Frolov K. V., Ovchinnikov S. G., Bartolome J.
Заглавие
: Spin-glass behavior in single crystals of hetero-metallic magnetic warwickites MgFeBO4, Mg0.5Co0.5FeBO4, and CoFeBO4
Коллективы
: MINECO Project [MAT11/23791, MAT2014-53921-R], DGA IMANA project [E-34], Russian Foundation for Basic Research [13-02-00958, 13-02-00358, 14-02-31051-mol-a], Council for Grants of the President of the Russian Federation [NSh-2886.2014.2, SP-938.2015.5], program of Foundation for Promotion of Small Enterprises in Science and Technology ("UMNIK" program)
Место публикации
: J. Magn. Magn. Mater.: Elsevier Science, 2015. - Vol. 392. - P.114-125. - ISSN 0304-8853,
DOI
10.1016/j.jmmm.2015.05.006. - ISSN 18734766(eISSN)
Примечания
: Cited References:36. - This work has been financed by the MINECO Project MAT11/23791, MAT2014-53921-R and DGA IMANA project E-34, Russian Foundation for Basic Research (project Nr. 13-02-00958, 13-02-00358 and 14-02-31051-mol-a), Council for Grants of the President of the Russian Federation (project Nr. NSh-2886.2014.2 and SP-938.2015.5). The work of one of coauthors (M.S.P.) was supported by the program of Foundation for Promotion of Small Enterprises in Science and Technology ("UMNIK" program).
Предметные рубрики:
SYSTEMS
CHAIN
Fe
SUSCEPTIBILITY
Fe2OBO3
ENERGY
Ключевые слова
(''Своб.индексиров.''): warwickites--spin glass--entanglement--exchange interaction
Аннотация:
Magnetic properties of heterometallic warwickites MgFeBO4, Mg0.5Co0.5FeBO4, and CoFeBO4 are presented, highlighting the effect of Co substitution on the magnetic properties of these compounds. The analysis of magnetization and heat capacity data has shown that these compounds exhibit a spin-glass transition below TSG=10, 20 and 22 K, respectively. Using zero field ac
susceptibility
as entanglement witness we find that the low dimensional magnetic behavior above TSG show quantum entanglement behavior χ(Τ)∝T−α(Τ) up to TE≈130 K. The α parameters have been deduced as a function of temperature and Co content, indicating the existence of random singlet phase in this temperature region. Above TE the paramagnetism is interpreted in terms of non-entangled spins giving rise to Curie–Weiss paramagnetism. The different intra- and inter-ribbon exchange interaction pathways have been calculated within a simple indirect coupling model. It is determined that the triangular motifs in the warwickite structure, together with the competing interactions, induce frustration. The spin-glass character is explained in terms of the substitutional disorder of the Mg, Fe and Co atoms at the two available crystallographic sites, and the frustration induced by the competing interactions. The Co substitution induces uniaxial anisotropy, increases the absolute magnetization and increases the spin-glass freezing temperature. The entanglement behavior is supported in the intermediate phase irrespective of the introduction of anisotropy by the Co substitution.Представлены магнитные свойства гетерометаллических варвикитов MgFeBO4, Mg0.5Co0.5FeBO4 и CoFeBO4, с выделением эффекта замещения Co на магнитные свойства этих соединений. Анализ данных намагниченности и теплоемкости показал, что эти соединения обладают спин-стекольным переходом ниже TSG=10, 20 и 22 К соответственно. Используя нулевого поля для переменной восприимчивости, мы находим, что низкоразмерных магнитное поведение выше TSG показать квантовая запутанность поведение χ (Τ) αT? α (Τ) до TEE130 К. Параметры α были выведены в зависимости от температуры и содержание Со, что указывает на существование случайного синглетного фазы в этой области температур. Над TE в Парамагнетизм интерпретируется в терминах перепутывания спинов, приводящих к парамагнетизму Кюри-Вейсса. Различные внутри- и обменного взаимодействия между направлениями были рассчитаны в модели простой косвенной связи. Установлено, что треугольные мотивы в структуре варвикита, вместе с конкурирующими взаимодействиями, вызывают фрустрацию. Характер спинового стекла объясняется в условиях беспорядка замещения атомов Mg, Fe и Co в двух доступных кристаллографических позициях, и фрустрацию, индуцированную конкурирующими взаимодействиями. Замена Со вызывает одноосную анизотропию, увеличивает абсолютную намагниченность и повышает температуру замерзания спинового стекла. Запутанность Поведения поддерживается в промежуточной фазе, независимо от анизотропии из-за введения замещения Со.
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16.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Ganzhenko I. M., Yakubaylik E. K.
Заглавие
: Magnetite losses decrease at the Abagurskaya concentrating plant
Место публикации
: Obogashch. Rud. - 2015. - Is. 1. - P.22-25. - ISSN 0202-3776
Примечания
: Cited References: 7
Ключевые слова
(''Своб.индексиров.''): magnetite--magnetic separator--neodymium-iron-boron--magnetic-field intensity--saturation magnetization, residual and in different fields--coercive force--specific magnetic
susceptibility
Аннотация:
Presently, owing to the wet magnetic concentration technology and equipment improvement, losses of magnetite iron in tailings were reduced close to 1 % at all iron ore processing facilities. This raises the question of magnetite losses limit value that may be reached on the basis of the available engineering and technical provision. The results of the investigations, performed with a view to estimate achievable level of magnetite losses at the Abagurskaya concentrating plant, are presented. As a result of the composition and magnetic properties investigations, carried out on samples of concentrate and classifiers overflow products, as well as final tailings in all processing operations, it was established, that losses of magnetite iron in tailings could be reduced to 0.5 %. With that, decrease by 0.15 % may be achieved by means of replacement of all barium-ferrite systems with the ones made of neodymium-iron-boron alloy, and by 0.30 %-through application of separators of the type PBR-P-90/250A in magnetite heavy-medium regeneration, as well as application of neodymium-iron-boron alloy magnets.
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17.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Коршунов, Максим Михайлович, Тогушова Ю. Н.
Заглавие
: Взаимосвязь сверхпроводимости и магнитных возбуждений в многоорбитальных системах
Место публикации
: Вестн. Новосиб. гос. ун-та. Сер.: Физика. - 2015. - Т. 10, Вып. 2. - С. 83-90. - ISSN 1818-7994
Примечания
: Библиогр.: 29 назв. - Материал данной работы был доложен на семинаре ОКНО-2014. Работа была выполнена при поддержке Минобрнауки РФ ГФ-2 (СФУ), РФФИ (грант 13-02-01395), программы Президиума РАН № 20.7, при государственной поддержке ведущих научных школ НШ-2886.2014.2, фонда «Династия» и МЦФФМ
Ключевые слова
(''Своб.индексиров.''): сверхпроводники на основе железа--спин-резонансный пик--спиновая восприимчивость--fe-based superconductors--spin-resonance peak--spin
susceptibility
Аннотация:
Рассмотрено влияние нетривиального сверхпроводящего параметра порядка на магнитную восприимчивость в многоорбитальной модели соединений железа. Показано, как формируется спин-резонансный пик, обсуждается его связь с экспериментальными данными по неупругому рассеянию нейтронов.We have considered the impact of the nontrivial superconducting order parameter on the magnetic
susceptibility
within the multiorbital model for the iron-based materials. The formation of the spin-resonance peak is demonstrated and its connection to the experimental data on the inelastic neutron scattering is discussed.
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18.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Val'kov V. V., Shustin M. S.
Заглавие
: Quantum renormalizations in anisotropic multisublattice magnets and the modification of magnetic
susceptibility
under irradiation
Коллективы
: Russian Foundation for Basic Research [13-02-00523, 14-02-31237, 15-42-04372]
Место публикации
: J. Exp. Theor. Phys.: MAIK Nauka-Interperiodica / Springer, 2015. - Vol. 121, Is. 5. - P.860-877. - ISSN 1063-7761,
DOI
10.1134/S1063776115110175. - ISSN 1090-6509(eISSN)
Примечания
: Cited References:46. - This work was supported by the Russian Foundation for Basic Research, project nos. 13-02-00523, 14-02-31237, and 15-42-04372
Предметные рубрики:
SINGLE-CHAIN MAGNETS
GLAUBER MODEL
EASY-PLANE
ARRANGEMENT
SYSTEMS
IONS
Аннотация:
The dispersion equation of a strongly anisotropic one-dimensional magnet catena-[FeII(ClO4)2{FeIII(bpca)2}]ClO4 containing alternating high-spin (HS) (S = 2) and low-spin (LS) (S = 1/2) iron ions is obtained by the diagram technique for Hubbard operators. The analysis of this equation yields six branches in the excitation spectrum of this magnet. It is important that the crystal field for ions with spin S = 2 is described by the Hamiltonian of single-ion easy-plane anisotropy, whose orientation is changed by 90° when passing from one HS iron ion to another. The U(N) transformation technique in the atomic representation is applied to diagonalize a single-ion Hamiltonian with a large number of levels. It is shown that the modulation of the orientation of easy magnetization planes leads to a model of a ferrimagnet with easy-axis anisotropy and to the formation of energy spectrum with a large gap. For HS iron ions, a decrease in the mean value of the spin projection due to quantum fluctuations is calculated. The analysis of the specific features of the spectrum of elementary excitations allows one to establish a correspondence to a generalized Ising model for which the magnetic
susceptibility
is calculated in a wide range of temperatures by the transfer-matrix method. The introduction of a statistical ensemble that takes into account the presence of chains of different lengths and the presence of iron ions with different spins allows one to describe the experimentally observed modification of the magnetic
susceptibility
of the magnet under optical irradiation.
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19.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Якубайлик, Эдуард Константинович, Балаев, Александр Дмитриевич, Ганженко, Игорь Михайлович, Бутов, Павел Юрьевич
Заглавие
: Корреляция магнитных свойств и содержания железа в продуктах мокрой магнитной сепарации
Место публикации
: Изв. вузов. Черн. металлургия: Нац. исслед. технол. ун-т "МИСиС", 2015. - Т. 58, № 10. - С. 744-748. - ISSN 0368-0797,
DOI
10.17073/0368-0797-2015-10-744-748
Примечания
: Библиогр.: 10
Ключевые слова
(''Своб.индексиров.''): мокрая сепарация--слив--концентрат--удельная намагниченность насыщения--удельная магнитная восприимчивость--wet separation--discharge--concentrate--specific saturation magnetization--specific magnetic
susceptibility
Аннотация:
Изучено изменение одного из основных параметров мокрого магнитного обогащения - содержания железа - и магнитных характеристик продуктов по технологической схеме обогащения Абагурской обогатительной фабрики (от слива классификаторов до концентрата 2-й стадии). Количество железа в пробах заметно растет с уменьшением крупности частиц. Приращение содержания железа магнетитового по схеме составляет 27,43 %, удельная намагниченности насыщения σ возрастает на 25,8 А·м2/кг; в поле сепарации Н = 175 кА/м прирост удельной намагниченности насыщения аналогичен - 25,76 А·м2/кг. Значения удельной магнитной восприимчивости χ в концентрате в сравнении со сливом выше. С ростом напряженности поля сепарации удельная восприимчивость продуктов уменьшается в несколько раз. По всей схеме обогащения наблюдается пропорциональность значений содержания железа и магнитных параметров продуктов. Учитывая эту закономерность, магнитные характеристики продуктов можно использовать для контроля и регулирования технологических режимов процессов мокрого магнитного обогащения.The change of one of the main parameters of wet magnetic concentration – the iron content and magnetic characteristics of products made by the concentration technological scheme of Abagur Enrichment Plant (from classifi er discharge to concentrate of the 2nd stage) has been studied. The iron content in the samples is growing signifi - cantly with the decrease of the particle coarseness. The increment of iron magnetite by the scheme is 27.43 %, the specifi c value of saturation magnetization σs increases by 25.8 A·m2/kg. The growth of specifi c magnetization in the separation fi eld H = 175 kA/m is similar – 25.76 A·m2/kg. The values of specifi c magnetic
susceptibility
χ in the concentrate are higher in comparison with the discharge. The specifi c product
susceptibility
decreases in several times with the growth of separation fi eld strength. Throughout the concentration scheme the quantity proportionality of iron content and magnetic parameters of products is observed. Taking into an account all the regularities, magnetic characteristics of the products can be used to control and regulate the process of technological modes of wet magnetic separation processes.
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20.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Ignatchenko V. A., Polukhin D. S.
Заглавие
: Development of a self-consistent approximation
Место публикации
: J. Phys. A: IOP Publishing, 2016. - Vol. 49, Is. 9. - Ст.095004. - ISSN 17518113 (ISSN),
DOI
10.1088/1751-8113/49/9/095004
Примечания
: Cited References: 43
Предметные рубрики:
SUPERCONDUCTING CRITICAL-TEMPERATURE
LATTICE-VIBRATIONS
VERTEX FUNCTION
ELECTRON
Ключевые слова
(''Своб.индексиров.''): self-consistent approximation--green's functions--vertex corrections--inhomogeneities--correlations--dynamic
susceptibility
Аннотация:
A self-consistent approximation of a higher level than the standard self-consistent approximation, known in various fields of physics as the Migdal, Kraichnan or Born self-consistent approximation, is derived taking into account both the first and second terms of the series for the vertex function. In contrast to the standard approximation, the new self-consistent approximation is described by a system of two coupled nonlinear integral equations for the self-energy and the vertex function. In addition to all the diagrams with non-intersecting lines of correlation/interaction taken into account by the standard self-consistent approximation, the new approach takes into account in each term of the Green's function expansion a significant number of diagrams with intersections of these lines. Because of this, the shape, linewidth, and amplitude of the resonance peaks of the dynamic
susceptibility
calculated in this approximation are much closer to the exact values of these characteristics. The advantage of the new self-consistent approach is demonstrated by the example of calculation of the dynamic
susceptibility
of waves in an inhomogeneous medium. © 2016 IOP Publishing Ltd.
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