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 Знайдено в інших БД:Книжкові видання та компакт-диски (1)Реферативна база даних (11)
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Загальна кількість знайдених документів : 8
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1.

Dyakonov V. P. 
Low-temperature magnetic behavior of the organic-based magnet Na(FeO6(C10H6N)3) [Електронний ресурс] / V. P. Dyakonov, E. Zubov, E. Aksimentyeva, K. Dyakonov, S. Piechota, H. Szymczak // Физика низких температур. - 2014. - Т. 40, № 7. - С. 835-841. - Режим доступу: http://nbuv.gov.ua/UJRN/PhNT_2014_40_7_13
The static and dynamic aspects of magnetic behavior of the complex of iron with 1-nitroso-2-naphthol Na[FeO6(C10H6N)3] as a function of temperature, frequency and magnetic field have been analysed. The ac susceptibility (<$E chi sub ac>) and dc magnetization (<$E M sub dc>) were measured over a temperature range of 1,5 - 200 K in external magnetic field up to 90 kOe and over a frequency range of 95 - 2000 Hz. The experimental data indicate the absence of magnetic long range order in this complex. The magnetization does not reach a saturation in field of 90 kOe at 1,5 K. At low temperatures, the following characteristic peculiarities of magnetic behavior of complex studied have been found, namely : cusp-like anomalies in the ac susceptibility and zero field coold (ZFC) magnetization at <$E T sub roman cusp~=~17> K; frequency dependence of the reusp temperature; remanence and time-dependent relaxation of ZFC magnetization. Attempts were made to compare the <$E chi sub ac> and <$E M sub dc> anomalies in complex studied with those of other magnetic systems. Comparison of characteristic peculiarities of magnetic behavior of the spin-glasses and superparamagnets was also performed. Although superparamagnetic behavior should not be completely ruled out as an explanation of the freezing phenomena in sample studied, the analysis of experimental results strongly suggests that the spin-glass-like behavior is a more consistent explanation.
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2.

Dyakonov V. 
Grain size effect on magnetic properties of REMnO3 (RE = Pr, Nd) [Електронний ресурс] / V. Dyakonov, W. Bażela, R. Duraj, M. Dul, Z. Kravchenko, E. Zubov, K. Dyakonov, S. Baran, A. Szytuła, H. Szymczak // Физика низких температур. - 2013. - Т. 39, № 4. - С. 452-458. - Режим доступу: http://nbuv.gov.ua/UJRN/PhNT_2013_39_4_8
X-ray diffraction and magnetic using dc and ac methods measurements of the polycrystalline and nanosize REMnO3 (RE = Pr, Nd) powdered samples have been performed. The nanosize manganites were synthesized with a sol-gel method at different (800, 850 and <$E900~symbol Р roman C>) temperatures. The average size of synthesized nanoparticles (from 56 to 89 nm) and polycrystalline powders (above 200 nm) was estimated using the x-ray diffraction data. All the compounds studied crystallize in the orthorhombic crystal structure (space group Pnma) at room temperature with smaller values of the lattice parameters in the nanosamples. The temperature-dependent ac magnetic susceptibilities show a sharp high-temperature peak connected with Mn magnetic moments ordering. The low-temperature maximum of magnetic susceptibility is proposed to be due to the polarization of the rareearth sublattice by an effective exchange field of the Mn ordered sublattice. The antiferromagnetic ordering of Mn sublattice and paramagnetic Curie temperatures as well as the magnetic moment values for the nanosize samples were found to be smaller than those for polycrystalline sample.
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3.

Borowiec M. T. 
The magnetic properties of potassium holmium double tungstate [Електронний ресурс] / M. T. Borowiec, V. P. Dyakonov, E. N. Khatsko, T. Zayarnyuk, E. E. Zubov, A. Szewczyk, M. U. Gutowska, A. I. Rykova, J. Piętosa, A. Majchrowski, E. Michalski, J.-U. Hoffmann, K. Prokes, K. Woźniak, Ł. Dobrzycki, M. Barański, V. Domukhovski, V. Shtyrkhunova, J. Żmija, H. Szymczak // Физика низких температур. - 2011. - Т. 37, № 8. - С. 854-859. - Режим доступу: http://nbuv.gov.ua/UJRN/PhNT_2011_37_8_6
The magnetic investigations of potassium holmium double tungstate KHo(WO4)2 have been performed. The results of measurements of magnetic susceptibility and magnetization as a function of temperature (T from 0,3 K up to 100 K) and magnetic field (up to 1,5 T) are presented. A strong anisotropy of magnetic properties was found. The magnetic measurements data were used to calculate the interaction energy. It was shown that the interactions between nearest neighbors Ho<^>3+ ions have antiferromagnetic character.
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4.

Zubov E. E. 
Electron dynamics in the normal state of cuprates: Spectral function, Fermi surface and ARPES data [Електронний ресурс] / E. E. Zubov // Физика низких температур. - 2016. - Т. 42, № 11. - С. 1328-1344. - Режим доступу: http://nbuv.gov.ua/UJRN/PhNT_2016_42_11_8
An influence of the electron - phonon interaction on excitation spectrum and damping in a narrow band electron subsystem of cuprates has been investigated. Within the framework of the t - J model an approach to solving a problem of account of both strong electron correlations and local electron - phonon binding with characteristic Einstein mode <$E omega sub 0> in the normal state has been presented. In approximation Hubbard-I it was found an exact solution for the polaron bands. We established that in the low-dimensional system with a pure kinematic part of Hamiltonian a complicated excitation spectrum is realized. It is determined mainly by peculiarities of the lattice Green's function. In the definite area of the electron concentration and hopping integrals a correlation gap may be possible on the Fermi level. Also, in specific cases it is observed a doping evolution of the Fermi surface. We found that the strong electron - phonon binding enforces a degree of coherence of electron - polaron excitations near the Fermi level and spectrum along the nodal direction depends on wave vector module weakly. It corresponds to ARPES data. A possible origin of the experimentally observed kink in the nodal direction of cuprates is explained by fine structure of the polaron band to be formed near the mode <$E - omega sub 0>.
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5.

Zubov E. 
Magnetic and magnetocaloric properties of the La0.9–xAgxMn1.1O3 compounds [Електронний ресурс] / E. Zubov, A. Pashchenko, N. Nedelko, I. Radelytskiy, K. Dyakonov, A. Krzyżewski, A. Ślawska-Waniewska, V. Dyakonov, H. Szymczak // Физика низких температур. - 2017. - Т. 43, № 10. - С. 1493-1499. - Режим доступу: http://nbuv.gov.ua/UJRN/PhNT_2017_43_10_9
The influence of Ag<^>+ ions and Mn non-stoichiometry on the magnetic properties and magnetocaloric effect in the La0,9-xAgxMn1,1O3 compounds has been studied. The Ag<^>+ ions content substituting for trivalent lanthanum ions was varied from x = 0,05 to 0,3. Magnetic measurements have been performed over a wide temperature (350 - 5 K) and magnetic field (up to 5 T) ranges. All the manganites studied show the ferromagnetic-like ordering with a first order magnetic phase transition. The magnetic entropy changes were evaluated from the isothermal curves of magnetization versus an applied magnetic field using both the thermodynamic Maxwell relation (MR) and calculation based on the Landau theory of phase transitions. The largest values of the magnetocaloric effect as well as the relative cooling power among the studied manganites are equal to 5,76 J/(kg-K) and 185 J/kg, respectively, for La0,9-xAgxMn1,1O3 in the magnetic field change of 5 T near the Curie temperature of TC = 271 K. A good correlation between the magnetization, colossal magnetoresistance and magnetic entropy changes as a function of Ag concentration in the La0,9-xAgxMn1,1O3 manganites was established.
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6.

Zubov E. 
Influence of replacement of Mn by Cr on magnetocaloric properties of quenched NiMn1–xCrxGe alloys [Електронний ресурс] / E. Zubov, N. Nedelko, A. Sivachenko, K. Dyakonov, Y. Tyvanchuk, M. Marzec, V. Valkov, W. Bazela, A. Slawska-Waniewska, V. Dyakonov // Фізика низьких температур. - 2018. - Т. 44, № 8. - С. 989-995. - Режим доступу: http://nbuv.gov.ua/UJRN/PhNT_2018_44_8_7
In this paper, the crystallographic, magnetic, thermomagnetic, and magnetocaloric properties of the quenched NiMn1-xCrxGe (x = 0,04, 0,18 and 0,25) half-Heusler alloys have been studied by x-ray diffraction, differential scanning calorimetry and magnetization measurements. An influence of partial substitution of Cr for Mn and quenching of the samples on the character of structural and magnetic phase transitions is presented. Quenching of the alloys results in the formation of two phase (orthorhombic and hexagonal) crystal structure. The magnetic properties were investigated by means of magnetization measurements over a wide temperature (5 - 400 K) and magnetic field (up to 60 kOe) ranges. The experimental data indicate that at quenching and with increasing Cr content the magnetic order changes from antiferromagnetic to ferromagnetic. Hardened compounds exhibit a thermal hysteresis in the vicinity of the magnetic phase transition, what is characteristic for a first-order magnetic phase transition. The magnetic phase transition temperatures are decreased as a result of quenching of the samples. The magnetic entropy changes were calculated using the field dependences of isothermal magnetization in terms of the thermodynamic Maxwell relation. The magnetic entropy changes, <$E | DELTA S sub M sup max |>, obtained for the hardened alloys with x = 0,25 have the maximum value equal to 23 J/(kg-K) near the magnetic phase transition for a field change of <$E DELTA H~=~0~-~60> kOe.
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7.

Dyakonov V. 
Phase transitions in TbMnO3 manganites [Електронний ресурс] / V. Dyakonov, A. Szytuła, R. Szymczak, E. Zubov, A. Szewczyk, Z. Kravchenko, W. Bażela, K. Dyakonov, A. Zarzycki, V. Varyukhin, H. Szymczak // Физика низких температур. - 2012. - Т. 38, № 3. - С. 273-277. - Режим доступу: http://nbuv.gov.ua/UJRN/PhNT_2012_38_3_8
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8.

Zubov E. E. 
Reentrant superconductivity in a hybrid heterostructure with a high transparency barrier [Електронний ресурс] / E. E. Zubov // Фізика низьких температур. - 2021. - Т. 47, Вип. 12. - С. 1079-1089. - Режим доступу: http://nbuv.gov.ua/UJRN/PhNT_2021_47_12_3
Within the framework of the self-consistent effective field approximation of the time-dependent perturbation theory, an influence of the electron tunneling on the spontaneously induced order parameters in a normal metal-superconductor hybrid structure is considered. For a normal-metal model, which does not take into account electron-electron scattering, as well as electron-phonon coupling, a critical barrier transparency, corresponding to the disappearance of superconductivity in the ground state, was obtained. The presence of incoherent excitations leads to a complex relationship between the effects of ordering, thermal fluctuations, and tunneling. Near the critical barrier transparency, this can stabilize a superconducting state in the certain temperature intervals. As a result, a reentrant superconductivity phenomenon was observed. The studied spectral properties of the hybrid structure reflect the existence of both coherent and incoherent elementary excitations.
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