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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Piskunova N. I.
Заглавие : Anomalies in magnetoresistance and in the bulk modulus for ferromagnetics with four-spin exchange interaction on the Kondo lattice
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2006. - Vol. 18, Is. 29. - P.6859-6868. - ISSN 0953-8984, DOI 10.1088/0953-8984/18/29/023
Примечания : Cited References: 29
Предметные рубрики: MIXED-VALENCE MANGANITES
PHASE-SEPARATION
LA1-XSRXMNO3
BEHAVIOR
PECULIARITIES
TRANSITION
Ключевые слова (''Своб.индексиров.''): elastic moduli--electric resistance--ferromagnetism--function evaluation--paramagnetism--transceivers--adiabatic approximation--kondo lattice--paramagnetic state--ring exchange--magnetoresistance
Аннотация: The temperature dependence of resistivity and the bulk modulus are calculated on the Kondo lattice, with ring exchange between localized spins, using the spin-polaron and adiabatic approximation. Peak and zero values of the bulk modulus as functions of temperature and concentration are determined below the temperature of the transition to the paramagnetic state. The effects of the nearest order between transverse spin components and a value of the ring exchange between localized spins on magnetoresistivity are estimated.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aver'yanov E. M.
Заглавие : Correlation of the molecular structure of discotic nematic liquid crystals with their orientational order and specific features of the nematic-isotropic phase transition
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2004. - Vol. 46, Is. 8. - P1554-1559. - ISSN 1063-7834, DOI 10.1134/1.1788794
Примечания : Cited References: 32
Предметные рубрики: MONTE-CARLO
ANISOTROPIC SYSTEMS
COMPUTER-SIMULATION
BEHAVIOR
TRIPHENYLENE
DISCOGEN
MESOGEN
FIELD
Аннотация: The orientational order parameter S of molecules in high-temperature discotic nematic liquid-crystal phases of triphenylene derivatives is investigated as a function of the length of side flexible molecular chains at different temperatures. It is established that the orientational order parameters S in the range of the transition from the nematic phase to the isotropic liquid phase (the N-D-I transition) are smaller than those predicted from the molecular-statistical theory and computer simulation. It is shown that the N-D-I transition is close to both the isolated Landau point and the tricritical point (regardless of the chemical structure of the molecules and the anisotropy of dispersion intermolecular interactions). Consistent explanations are offered for a number of experimental findings, such as the anomalously small changes in the enthalpy and entropy upon the N-D-I transition (as compared to those revealed upon the N-I transition in calamitic nematic liquid crystals), the anomalously strong response of the isotropic phase of discotic nematic liquid crystals to external fields (thermodynamically conjugate to the order parameter S) and the long relaxation times of this response, and the formation of cybotactic discotic molecular clusters in the isotropic phase in the vicinity of the N-D-I transition. (C) 2004 MAIK "Nauka / Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aver'yanov E. M.
Заглавие : New features of a smectic-A-crystal-B phase transition in a homologous series of liquid crystals
Место публикации : JETP Letters. - 2014. - Vol. 99, Is. 3. - P.158-163. - ISSN 0021-3640, DOI 10.1134/S0021364014030047. - ISSN 1090-6487
Примечания : Cited References: 21
Предметные рубрики: POLARIZABILITY
POLYMORPHISM
ANISOTROPY
MOLECULES
BEHAVIOR
Аннотация: The components L j of the Lorentz tensor and the polarizability density of molecules G in the smectic-A and crystalline-B phases have been determined for homologues of the series of alkyl-p-(4-alkoxybenzylideneamino-)cinnamates. The quantity L j (G) in both phases is a linear (quadratic) function of the orientational order parameter of molecules S, which is invariant (noninvariant) with respect to the A-B transition, which is manifested in the form of jumps δL j and δG and enhancement of the G(S) dependence. An increase in the length of terminal molecular chains and weakening of interlayer correlation of molecules are accompanied by strengthening of the A-B transition of the first order and G(S) dependences in both phases together with an increase in δL j and δG. Change δG and dependence G(S) in the B phase are related to change in the conformation (flattening) of aromatic molecular cores.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Semenov S. V., Petrov M. I.
Заглавие : Correlation between magnetoresistance and magnetization hysteresis in a granular high-T C superconductor: Impact of flux compression in the intergrain medium
Место публикации : J. Supercond. Nov. Magn.: Springer, 2014. - Vol. 27, Is. 6. - P.1425-1429. - ISSN 1557-1939, DOI 10.1007/s10948-014-2491-6. - ISSN 1557-1947
Примечания : Cited References: 27
Предметные рубрики: HIGH-TEMPERATURE SUPERCONDUCTOR
JOSEPHSON MEDIUM
CRITICAL-STATE
YBA2CU3O7-DELTA
FIELDS
BEHAVIOR
HTSC
COMPOSITES
RESISTANCE
MOTION
Ключевые слова (''Своб.индексиров.''): granular superconductor--josephson medium--effective field--magnetoresistance--magnetization hysteresis
Аннотация: The correlation between experimental magnetic field dependences of magnetoresistance and magnetization hysteresis in granular YBa2Cu3O7 is established. Within the proposed approach, magnetoresistance is assumed to be determined by the effective field in the intergrain boundaries the ensemble of which is considered to be a Josephson medium. The effective field in the intergrain medium can be written in the form B (eff)(H)=H-4 pi M(H)x alpha, where alpha is the parameter of averaged demagnetizing factors of grains and the degree of flux compression. A comparison of experimental magnetoresistance R(H) and magnetization M(H) hysteresis dependences obtained at different external magnetic field sweep rates yields the value alpha similar to 10, which is caused by the flux compression between grains. The proposed model describes well most of the features of the magnetoresistance hysteresis in granular high-T (C) superconductors.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Berman G. P., Kolovskii A. R.
Заглавие : Quantum chaos in interactions of multilevel quantum-systems with a coherent radiation-field
Место публикации : Uspekhi Fiz. Nauk. - 1992. - Vol. 162, Is. 4. - P.95-141. - ISSN 0042-1294
Примечания : Cited References: 36
Предметные рубрики: QUASIENERGY FUNCTIONS
RESONANCES
BEHAVIOR
OVERLAP
Аннотация: The paper is short review of the papers devoted to the dynamics of the multilevel quantum systems affected by the external periodic field. The main attention is paid to the phenomenon of the quantum nonlinear resonance and the interaction of the two quantum nonlinear resonances, when the dynamics of the system is chaotic in the classical limit. The paper also contains the analysis of some physical systems where these phenomena take place. 30 figs. 37 refs.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Sadreev A. F.
Заглавие : Propagating Bloch bound states with orbital angular momentum above the light line in the array of dielectric spheres
Коллективы : Ministry of Education and Science of the Russian Federation (Minobrnauka) [N 3.1845.2017]; Russian Foundation for Basic Research (RFBR) [16-02-00314]
Место публикации : J. Opt. Soc. Am. A: Optical Society of America, 2017. - Vol. 34, Is. 6. - P.949-952. - ISSN 1084-7529, DOI 10.1364/JOSAA.34.000949. - ISSN 1520-8532(eISSN)
Примечания : Cited References:37. - Ministry of Education and Science of the Russian Federation (Minobrnauka) (N 3.1845.2017); Russian Foundation for Basic Research (RFBR) (16-02-00314).
Предметные рубрики: GUIDED-WAVES
CONTINUUM
BEHAVIOR
GRATINGS
Аннотация: We present propagating Bloch bound states in the radiation continuum with orbital angular momentum in an infinite linear periodical array of dielectric spheres. The bound states in the continuum demonstrate a giant Poynting vector spiraling around the array. They can be excited by a plane wave with incident linear polarization with a small tilt relative to the axis of the array.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhaleva E. A., Flerov I. N., Gorev M. V., Molokeev M. S., Cherepakhin A. V., Kartashev A. V., Mikhashenok N. V., Sablina K. A.
Заглавие : Caloric characteristics of PbTiO3 in the temperature range of the ferroelectric phase transition
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 54, Is. 9. - P.1832-1840. - ISSN 1063-7834, DOI 10.1134/S1063783412090181
Примечания : Cited References: 31. - This study was supported by the Russian Foundation for Basic Research (project no. 12-08-00079) and the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools of the Russian Federation (grant no. NSh-4828.2012.2).
Предметные рубрики: SINGLE-CRYSTALS
LEAD TITANATE
DIELECTRIC PROPERTIES
SOLID-SOLUTIONS
PRESSURE
PEROVSKITES
DEPENDENCE
BEHAVIOR
HEAT
Аннотация: The heat capacity and thermal expansion of the PbTiO3 ceramic sample have been measured in the temperature range 80–970 K. The electrocaloric and barocaloric efficiencies of lead titanate in the ferroelectric phase transition range have been investigated by analyzing the experimental data in terms of the thermodynamic theory of phase transitions, the electrical equation of state P(T, E), the Pippard equation, and the S(T, p) diagram.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ritter C., Pankrats A.I., Gudim, I. A., Vorotynov A.M.
Заглавие : Determination of the magnetic structure of SmFe3(BO3)4 by neutron diffraction: comparison with other RFe3(BO3)4 iron borates
Место публикации : J. Phys.: Condens. Matter: IOP Publishing Ltd, 2012. - Vol. 24, Is. 38. - Ст.386002. - ISSN 0953-8984, DOI 10.1088/0953-8984/24/38/386002
Примечания : Cited References: 40. - This work was supported by RFBR, grant No. 10-02-00765.
Предметные рубрики: SPIN REORIENTATION
EARTH
GDFE3(BO3)4
BEHAVIOR
Аннотация: Temperature dependent neutron diffraction studies were performed on SmFe3(BO3)4. The crystallographic structure was determined to stay as R32 over the whole studied temperature range of 2 K ‹ T ‹ 300 K. A magnetic phase transition characterized by the magnetic propagation vector κ = [0 0 3/2] takes place at TN = 34 K. The magnetic structure sees an easy-plane arrangement within the trigonal basal a–b-plane of ferromagnetic layers of iron and samarium having a canting angle of about 70° relative to each other. Neighbouring layers in the c-direction are antiferromagnetically coupled; at 2 K the magnetic moment values amount to μFe = 4.2(1) μB and μSm = 0.8(2) μB. The non-Brillouin type increase of the iron magnetic moment below TN points to a strong Fe–Sm exchange and to the simultaneous appearance of long range magnetic order on both sublattices.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Freydman A. L., Balaev A. D., Dubrovskiy A. A., Eremin E. V., Temerov V. L., Gudim, I. A.
Заглавие : Direct and inverse magnetoelectric effects in HoAl3(BO3)4 single crystal
Коллективы : Russian Foundation for Basic Research [13-02-12442ofi_m2, 14-02-00307]
Место публикации : J. Appl. Phys.: American Institute of Physics, 2014. - Vol. 115, Is. 17. - Ст.174103. - ISSN 0021-8979, DOI 10.1063/1.4874270. - ISSN 1089-7550
Примечания : Cited References: 34. - This work was supported by Russian Foundation for Basic Research (Project Nos. 13-02-12442ofi_m2 and 14-02-00307). The authors are grateful to V. N. Ilyushchenko for the help in preparing of this manuscript.
Предметные рубрики: POLARIZATION
BEHAVIOR
ORDER
Аннотация: The direct (MEH-) and inverse (MEE-) magnetoelectric effects in the HoAl3(BO3)4 single crystal are studied. Temperature and magnetic field dependences of permittivity of the crystal are investigated. A relation between the investigated effects was established. It was found that the magnetoelectric effect can exist in crystals without magnetic order or spontaneous polarization. It was shown that the phenomena investigated are due to magnetostriction or magnetoelastic effect. The thermodynamic potential was considered for describing magnetoelectric effect at low magnetic fields. The results obtained are explained within a proposed qualitative microscopic model, based on interplay of configuration of 4f- electron subshell of the rare-earth element and applied magnetic or electric field.Изучаются прямой (MEH-) и обратный (МЭА-) магнитоэлектрические эффекты в монокристалле HoAl3(BO3)4 . Зависимости диэлектрической проницаемости кристалла от температуры и магнитного поля исследованы. Была создана связь между исследованными эффектами. Было обнаружено, что магнитоэлектрический эффект может существовать в кристаллах без магнитного порядка или спонтанной поляризации. Было показано, что исследуемые явления происходят из-за магнитострикции или магнитоупругого эффекта. Термодинамический потенциал рассчитывался для описания магнитоэлектрический эффект в слабых магнитных полях. Полученные результаты объясняются в рамках предложенной качественной микроскопической модели, основанной на взаимодействии конфигурации 4f-электронов в подоболочке редкоземельного элемента и внешнего магнитного или электрического поля.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Dudnikov V. A., Orlov Yu. S., Solovyov, Leonid A., Vereshchagin, Sergey N., Gavrilkin, Sergey Yu., Tsvetkov, Alexey Yu., Velikanov D. A., Gorev M. V., Novikov, Sergey V., Ovchinnikov S. G.
Заглавие : Effect of multiplicity fluctuation in cobalt ions on crystal structure, magnetic and electrical properties of NdCoO3 and SmCoO3
Коллективы : Russian Science FoundationRussian Science Foundation (RSF) [18-02-00022]
Место публикации : Molecules. - 2020. - Vol. 25, Is. 6. - Ст.1301. - ISSN 1420-3049(eISSN), DOI 10.3390/molecules25061301
Примечания : Cited References: 56. - This work is supported by the Russian Science Foundation grant 18-02-00022.
Предметные рубрики: SPIN-STATE TRANSITIONS
CO3+ ION
CONDUCTIVITY
TEMPERATURE
BEHAVIOR
Аннотация: The structural, magnetic, electrical, and dilatation properties of the rare-earth NdCoO3 and SmCoO3 cobaltites were investigated. Their comparative analysis was carried out and the effect of multiplicity fluctuations on physical properties of the studied cobaltites was considered. Correlations between the spin state change of cobalt ions and the temperature dependence anomalies of the lattice parameters, magnetic susceptibility, volume thermal expansion coefficient, and electrical resistance have been revealed. A comparison of the results with well-studied GdCoO3 allows one to single out both the general tendencies inherent in all rare-earth cobaltites taking into account the lanthanide contraction and peculiar properties of the samples containing Nd and Sm.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivanova N. B., Kazak N. V., Michel C. R., Balaev A. D., Ovchinnikov S. G., Vasil'ev A. D., Bulina N. V., Panchenko E. B.
Заглавие : Effect of strontium and barium doping on the magnetic state and electrical conductivity of GdCoO3
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2007. - Vol. 49, Is. 8. - P1498-1506. - ISSN 1063-7834, DOI 10.1134/S1063783407080161
Примечания : Cited References: 36
Предметные рубрики: PEROVSKITE
ORDER
OXIDE
BEHAVIOR
GLASSES
LACOO3
PR
GD
SM
ND
Аннотация: A coordinated investigation of the magnetic and electrical properties of polycrystalline cobalt oxide compounds CdCoO3, Gd0.9Ba0.1CoO3, and Gd0.9Sr0.1CoO3 is carried out. Undoped GdCoO3 reveals a low conductivity; a magnetic moment of 7.4 mu(B) per molecule, which is less than the theoretical value for the Gd3+ ion; and an asymptotic Curie temperature of -6 K. Doping GdCoO3 with barium and strontium to substitution of 10 at. % Gd brings about an increase in the conductivity and magnetic transitions at T = 300 K for Gd0.9Ba0.1CoO3 and T = 170 K for Gd0.9Sr0.1CoO3. The magnetization anomalies imply the formation of magnetic clusters. The behavior of the electrical conductivity at high temperatures suggests a variable activation energy. At low temperatures, Mott hopping conduction sets in.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sadrieva Z. F., Belyakov M. A., Balezin M. A., Kapitanova P. V., Nenasheva E. A., Sadreev A. F., Bogdanov A. A.
Заглавие : Experimental observation of a symmetry-protected bound state in the continuum in a chain of dielectric disks
Коллективы : Russian Science Foundation [17-12-01581]; RFBR [18-32-20205]; Ministry of Education and Science of the Russian Federation [3.1668.2017/4.6]; Foundation for the Advancement of Theoretical Physics and Mathematics "BASIS"
Место публикации : Phys. Rev. A. - 2019. - Vol. 99, Is. 5. - Ст.053804. - ISSN 2469-9926, DOI 10.1103/PhysRevA.99.053804. - ISSN 2469-9934(eISSN)
Примечания : Cited References:61. - The numerical simulations and experimental part of this work were supported by the Russian Science Foundation (Grant No. 17-12-01581), and the analytical calculations were supported by RFBR (Grant No. 18-32-20205) and the Ministry of Education and Science of the Russian Federation (3.1668.2017/4.6). The authors are thankful to Andrey Sayanskiy for assistance in the holder fabrication. A.A.B. and Z.F.S. acknowledge the Foundation for the Advancement of Theoretical Physics and Mathematics "BASIS" for valuable financial support.
Предметные рубрики: LIGHT
RESONANCES
RADIATION
MOMENTUM
BEHAVIOR
LAYER
Аннотация: The existence of bound states in the continuum (BIC) manifests a general wave phenomenon first predicted in quantum mechanics by John von Neumann and Eugene Wigner [J. von Neumann and E. Wigner, Phys. Z. 30, 465 (1929)]. Today it is being actively explored in photonics, radiophysics, acoustics, and hydrodynamics. We report an experimental observation of an electromagnetic bound state in the radiation continuum in a one-dimensional array of dielectric particles. By measurement of the transmission spectra of the ceramic disk chain at GHz frequencies, we demonstrate how a resonant state in the vicinity of the center of the Brillouin zone turns into a symmetry-protected BIC with increase in the number of the disks. We estimate a number of the disks when the radiation losses become negligible in comparison to material absorption and, therefore, the chain could be considered practically as infinite. The presented analysis is supplemented by measurements of the near fields of the symmetry-protected BIC. All measurements are in a good agreement with the results of the numerical simulation and analytical model based on a tight-binding approximation. The obtained results provide useful guidelines for practical implementations of structures with bound states in the continuum that opens up horizons for the development of optical and radio-frequency metadevices.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Golovnev N. N., Vasiliev A. D., Kirik S. D.
Заглавие : Enrofloxacinium citrate monohydrate: Preparation, crystal structure, thermal stability and IR-characterization
Место публикации : J. Mol. Struct.: Elsevier Science BV, 2012. - Vol. 1021. - P.112-117. - ISSN 0022-2860, DOI 10.1016/j.molstruc.2012.04.059
Примечания : Cited References: 22. - The authors are grateful to the Ministry of Education and Science (Government Contracts # 02.740.11.0629) for the financial support of the investigation.
Предметные рубрики: COCRYSTAL
ANTIBACTERIAL
BEHAVIOR
STATE
ACID
Ключевые слова (''Своб.индексиров.''): enrofloxacin--citric acid--crystal structure--ir spectra--thermal analysis
Аннотация: Enrofloxacinium citrate monohydrate (I), C19H 23FN3O3+В·C6H7O7- В·H2O, [C19H22FN3O3 - enrofloxacin, EnrH] has been crystallized from the mutual solution of citric acid and enrofloxacin in ambient conditions. The colorless crystals have been investigated using X-ray single crystal and powder techniques, and characterized by differential scanning calorimetry, thermogravimetry and infrared spectroscopy. The obtained compound can be considered as a salt with enrofloxacinium in the role of a cation and citrate as an anion. The ions ratio equals to 1:1. The compound crystallizes in the triclinic lattice with a = 9.0489(8) A, b = 9.6531(8) A, c = 14.913(1) A, ? = 98.813(1)В°, ? = 92.029(1)В°, ? = 91.013(1)В°, Z = 2, V = 1286.1(2) A3, S.G. P1?. The crystal structure determination reveals the importance of inter- and intramolecular interactions in the crystal formation. The EnrH2+andH3Cit- molecular ions are packed in alternating layers with water molecules inserted into the citrate layers. A citrate ion in the layer is linked via H-bondings with two adjacent ones and three water molecules. Enrofloxacinium cations are packaged by means of a benched mode and every cation is linked by three intermolecular thymus type H-bondings with nitrogens of adjacent cations and by two links with the oxygen of the citrate ions. The infrared spectra gave the evidence of H-bonding formation in the obtained salt. The ?-stacking interactions are observed between the aromatic cycles of the adjacent cations which are located in an antiparallel style in a layer. В© 2012 Elsevier B.V. All rights reserved.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Padamata, Sai Krishna, Yasinskiy A., Shabanov A. V., Bermeshev T., Yang Y. J., Wang Z. W., Cao D., Polyakov P.
Заглавие : Improving corrosion resistance of Cu-Al-based anodes in KF-AlF3-Al2O3 melts
Коллективы : State Assignment for the Science of Siberian Federal University, Russia [FSRZ-2020-0013]
Место публикации : Trans. Nonferrous Met. Soc. China. - 2022. - Vol. 32, Is. 1. - P.354-363. - ISSN 1003-6326, DOI 10.1016/S1003-6326(22)65800-X. - ISSN 2210-3384(eISSN)
Примечания : Cited References: 24. - The work is performed as a part of the State Assignment for the Science of Siberian Federal University, Russia (No. FSRZ-2020-0013) . Use of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center "Krasnoyarsk Science Center SB RAS" is acknowledged
Предметные рубрики: NI-FE
ALUMINUM ELECTROLYSIS
INERT ANODES
NICKEL FERRITE
BEHAVIOR
Аннотация: The anodic behaviour of pre-oxidised and non-oxidised Cu−Al-based anodes (Cu−10Al and Cu−9.8Al−2Mn) in KF−AlF3−Al2O3 melts was studied through galvanostatic and potentiodynamic polarization techniques. The alloy compositions were oxidised for a short-term (8 h) at 700 °C, followed by galvanostatic polarization for 1 h at 800 °C with an applied current density of 0.4 A/cm2. The potentiodynamic curves were recorded with a sweep rate of 0.01 V/s. XRD analysis was conducted on frozen melt samples collected on the surface of the anode, and SEM observation was performed on the anode after the experiment to study the phases of the scales formed on the alloys. All the anode materials had a steady potential between 2.30 and 2.50 V(vs Al/AlF3). The corrosion rates of the anodes were calculated from the data acquired through potentiodynamic polarization. It was seen that pre-oxidised anodes possess a low corrosion rate compared to those without pre-oxidation treatment.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gokhfeld D. M., Semenov S. V., Terentyev K. Yu., Yakimov I. S., Balaev D. A.
Заглавие : Interplay of magnetic and superconducting subsystems in Ho-doped YBCO
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of the Krasnoyarsk Territory, Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, project "Superconducting properties of YBCO incorporated by paramagnetic rare-earth elements" [20-42-240008]
Место публикации : J. Supercond. Nov. Magn. - 2021. - Vol. 34. Is. 10. - P.2537-2543. - ISSN 1557-1939, DOI 10.1007/s10948-021-05954-3. - ISSN 1557-1947(eISSN)
Примечания : Cited References: 26. - This work was supported by the Russian Foundation for Basic Research and the Government of the Krasnoyarsk Territory, Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, project "Superconducting properties of YBCO incorporated by paramagnetic rare-earth elements" No. 20-42-240008
Предметные рубрики: TEMPERATURE
TRANSPORT
PEAK
DY
SUSCEPTIBILITY
TRANSITION
BEHAVIOR
Аннотация: Superconducting and paramagnetic contributions to the magnetization of polycrystalline Y1−xHoxBa2Cu3O7−δ samples were investigated. The superconductivity is responsible for a partial screening of magnetic ions from an external magnetic field and for a possible sinking of antiferromagnetic correlations between these ions. Magnetic moments of Ho ions influence on a peak effect induced by the order–disorder transition of the Abrikosov vortex lattice. The critical current density and the critical temperature of YBCO are not changed by the Ho doping.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mel'nikova S. V., Isaenko L. I., Gorev M. V., Vasil'ev A. D., Lobanov S. I.
Заглавие : Investigation of the structure, physical properties, and phase transition in SrAlF5
Коллективы :
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2010. - Vol. 52, Is. 3. - P509-514. - ISSN 1063-7834, DOI 10.1134/S1063783410030108
Примечания : Cited References: 16. - This study was supported by the Russian Foundation for Basic Research (project no. 07-02-00442) and the Siberian Branch of the Russian Academy of Sciences within the framework of the Interdisciplinary Integration Project No. 34.
Предметные рубрики: CRYSTAL-STRUCTURE
BEHAVIOR
GROWTH
SRAIF5
Аннотация: Crystals of SrAlF5 have been grown by the Bridgman method from the melt and by sintering of the components. Optical polarization studies and measurements of the thermal expansion and birefringence coefficients have been carried out over a wide temperature range. The electromechanical coefficient d (33) has been measured, and the optical second harmonic, dielectric hysteresis loop, and optical quality of the crystal have been assessed. X-ray diffraction investigations have been performed to identify the revealed compounds. It has been demonstrated that the SrAlF5 crystals obtained under the growth conditions chosen have I4(1)/a symmetry and do not undergo structural phase transitions in the temperature range 100-800 K. Crystalline inclusions of the AlOF oxyfluoride have been revealed in crystals grown with an AlF3 excess. The birefringence of the AlOF crystal is an order of magnitude higher than that of SrAlF5, does not depend on temperature, and has no anomalies up to 800 K.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kazak N.V., Ivanova N.B., Rudenko V.V., Vasil'ev A.D., Velikanov D.A., Ovchinnikov S.G.
Заглавие : Low-field magnetization of ludwigites Co3O2BO3 and Co3-x Fe (x) O2BO3 (x a parts per thousand 0.14)
Коллективы : Federal Agency for Science and Innovation [MK-4278.2008.2]
Разночтения заглавия :авие SCOPUS: Low-field magnetization of ludwigites Co3O2BO 3 and Co3 - X Fe x O2BO3 (x ≈ 0.14)
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2009. - Vol. 51, Is. 5. - P966-969. - ISSN 1063-7834, DOI 10.1134/S1063783409050138
Примечания : Cited References: 17. - This study was supported by the Branch of General Physics and Astronomy of the Russian Academy of Sciences (program "Strongly Correlated Electrons") and the Federal Agency for Science and Innovation (project no. MK-4278.2008.2).
Предметные рубрики: ELECTRICAL-PROPERTIES
FE3O2BO3
BEHAVIOR
Аннотация: Ludwigite single crystals of compositions Co3O2BO3 and Co3 - x Fe (x) O2BO3 (x a parts per thousand 0.14) have been synthesized. The crystal structure is investigated at room temperature, and the magnetization is studied in the temperature range T = 4.2-100 K in magnetic fields of up to 600 Oe. The orthorhombic symmetry is revealed, and the unit cell parameters are determined. A number of features are established for the temperature dependence of the magnetization. In unsubstituted Co3O2BO3, two magnetic transitions are found at T (C1) = 43 K and T (C2) = 15 K. At temperatures below 40 K, spin-glass state is revealed. Substitution of iron ions for cobalt ions leads to a noticeable shift in the magnetic transitions toward the high-temperature range: T (C1) = 83 K and T (C2) = 74 K. A ferromagnetic ordering of the P type is found in the Co3 - x Fe (x) O2BO3 (x a parts per thousand 0.14) compound.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Frolov K. V., Lyubutin I. S., Smirnova E. S., Alekseeva O. A., Verin I. A., Artemov V. V., Kharlamova S. A., Bezmaternykh L. N., Gudim, I. A.
Заглавие : Low-temperature structural and magnetic phase transitions in multiferroic GdFe3(BO3)4
Коллективы : Russian Foundation for Basic Research [14-02-00483a, 13-02-12442]; Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools [NSh-1130.2014.5, NSh-924.2014.2]; Russian Ministry of Education and Science [RFMEFI62114X0005]
Место публикации : J. Alloys Compd.: Elsevier Science, 2016. - Vol. 671. - P.545-551. - ISSN 0925-8388, DOI 10.1016/j.jallcom.2016.02.083. - ISSN 1873-4669(eISSN)
Примечания : Cited References:36. - We thank Dr. A.P. Dudka for help in the low temperature XRD measurements. This study was supported in part by the Russian Foundation for Basic Research (projects # 14-02-00483a and 13-02-12442), and the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools (grant # NSh-1130.2014.5 and # NSh-924.2014.2). This work was performed using the equipment of the Shared Research Center IC RAS and was supported by the Russian Ministry of Education and Science (project RFMEFI62114X0005).
Предметные рубрики: IRON BORATE GDFE3(BO3)4
BIFEO3 THIN-FILMS
MAGNETOELASTIC PROPERTIES
RM3(BO3)4 CRYSTALS
TRIGONAL GDFE3(BO3)4
ENHANCED POLARIZATION
HIGH-PRESSURES
CRYSTALLIZATION
BEHAVIOR
GROWTH
Ключевые слова (''Своб.индексиров.''): multiferroics--rare earth compounds--x-ray diffraction--mossbauer--spectroscopy--crystal structure--spin dynamics
Аннотация: X-ray analysis revealed that at temperature decreasing from room temperature to Tstr = 155 K the crystal unit cell GdFe3(BO3)4 is reduced only along the c axis (at 0.01 Å), while the a and b axes are unchanged within the error limits. The volume of the crystal decreases uniformly in the direction of all three axes at 155–80 K. At 80–30 K the crystal volume is decreased only by reduction of the parameters a and b, while the parameter c increases conversely. In the paramagnetic region Mössbauer spectra do not distinguish between the two structural positions of iron ions Fe1 and Fe2, appearing at T < Tstr. Below the temperature of the magnetic phase transition at TN = 38.0(1) K the Mössbauer data indicate quasi-one-dimensional magnetic ordering of iron moments in the sublattice Fe2 and a two-dimensional one in the iron sublattice Fe1. The dynamics of spin reorientation in sublattices Fe1 and Fe2 is studied in detail.Рентгеновский анализ показал, что при уменьшении температуры от комнатной до Tstr = 155 K изменение параметра элементарной ячейки кристалла GdFe3(BO3)4 происходит лишь вдоль оси с (при 0,01 Å), в то время как а и b оси остаются неизменными в пределах погрешности измерений. Объем кристалла уменьшается равномерно в направлении всех трех осей при 155-80 K. При 80-30 K объем кристалла уменьшается только уменьшением параметров a и b, в то время как параметр с наоборот увеличивается. В парамагнитной области Мессбауэровские спектры не различают двух структурных позиций ионов железа Fe1 и Fe2, появляющиеся при Т˂Tstr. Ниже температуры магнитного фазового перехода при TN = 38,0(1) К Мёссбауэрские данные указывают на квази-одномерный магнитное упорядочение моментов железа в подрешетке Fe2 и двумерное в железной подрешетке Fe1. Динамика спиновой переориентации в подрешетках Fe1 и Fe2 подробно изучается.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Atuchin V. V., Gavrilova T. A., Kesler V. G., Molokeev M. S., Aleksandrov K. S.
Заглавие : Low-temperature synthesis and structural properties of ferroelectric K 3WO3F3 elpasolite
Место публикации : Chem. Phys. Lett. - 2010. - Vol. 493, Is. 1-3. - P.83-86. - ISSN 0009-2614, DOI 10.1016/j.cplett.2010.05.023
Примечания : Cited References: 37
Предметные рубрики: PEROVSKITE-LIKE OXYFLUORIDES
CORE-LEVEL SPECTROSCOPY
PHASE-TRANSITIONS
SOLID-STATE
ELECTRON-DIFFRACTION
DIFFUSE-SCATTERING
RHEED ANALYSIS
POLAR
BEHAVIOR
(NH4)(3)TIOF5
Ключевые слова (''Своб.индексиров.''): chemical synthesis--elpasolite--ferroelectric phase transition--fluorine atoms--low temperature synthesis--low temperatures--oxyfluorides--partial ordering--room temperature--sem--space groups--structure parameter--xrd--chemical properties--ferroelectric materials--ferroelectricity--fluorine--oxygen--phase transitions--rietveld method--single crystals--synthesis (chemical)--x ray photoelectron spectroscopy--x ray powder diffraction--scanning electron microscopy
Аннотация: Low-temperature ferroelectric G2 polymorph of K3WO 3F3 has been prepared by chemical synthesis. Structural and chemical properties of the final product have been evaluated with X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Structure parameters of G2-K 3WO3F3 are refined by the Rietveld method from XRD data measured at room temperature (space group Cm, Z = 2, a = 8.7350(3), b = 8.6808(5), c = 6.1581(3), ? = 135.124(3), V = 329.46(3) 3; RB = 2.47%). Partial ordering of oxygen and fluorine atoms has been found over anion positions. Mechanism of ferroelectric phase transition in A2BMO3F3 oxyfluorides is discussed. В© 2010 Elsevier B.V. All rights reserved.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lundin A. A., Zobov V. E.
Заглавие : Order dependence of the profile of the intensities of multiple-quantum coherences
Место публикации : J. Exp. Theor. Phys.: MAIK Nauka-Interperiodica / Springer, 2015. - Vol. 120, Is. 5. - P.762-771. - ISSN 1063, DOI 10.1134/S1063776115040093. - ISSN 10906509(eISSN)
Примечания : Cited References:62
Предметные рубрики: PARAMAGNETIC SPIN SYSTEMS
FREE-INDUCTION DECAY
NMR-SPECTRA
AUTOCORRELATION FUNCTIONS
FLUCTUATION SPECTRUM
TEMPERATURE DYNAMICS
LINE-SHAPE
SOLIDS
IRREVERSIBILITY
BEHAVIOR
Аннотация: A modification of the widespread phenomenological model theory of multiple-quantum (MQ) nuclear magnetic resonance spectra of a single cluster of correlated spins has been developed. In contrast to the mentioned theory, the size distribution of such clusters has been consistently taken into account. To obtain the distribution, solutions for the amplitudes of the expansion in the complete set of orthogonal operators are used. Expressions specifying the dependence of the profile of the intensities of MQ coherences on their number n (order) have been obtained. The total form of the dependence has been evaluated by means of the numerical implementation of the resulting expressions. The asymptotic expressions for large n values (wings of the spectrum) have been obtained analytically by the saddle-point method. It has been shown that the dependence under study has a Gaussian central part and exponential wings. The results obtained are in agreement with the previous calculations for some model systems and existing experimental data.
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