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Особенности поведения магнитных подсистем в Nd2BaNiO5
Журнал экспериментальной и теоретической физики. 2014. Т. 145. № 4. С. 697-708.
The temperature dependences of the heat capacity, the magnetic susceptibility, and the splitting of the ground Kramers doublet of the Nd3+ ion in the chain magnet Nd2BaNiO5 are studied. An antiferromagnetic phase transition manifests itself as anomalies in all these dependences. The parameters of the Nd–Ni and Nd–Nd interactions are estimated. The field dependence of the magnetization has two anomalies. A strong magnetic anisotropy prevents the magnetic moments of the Nd3+ ion from deviating from axis c in the crystal even in an external magnetic field. The processes of magnetization and the internal specific features of a chain of spins S = 1 are discussed.
Publication based on the results of:
Popova E., Klimin S. A., Popova M. N. et al., Journal of Magnetism and Magnetic Materials 2013 Vol. 331 P. 133-139
We present the magnetic properties of (Y1-xNdx) 2BaNiO5 (x=1, 0.15) investigated by means of specific heat, magnetic susceptibility, and spectroscopic measurements. Magnetic ordering occurs at 47 K and 13 K in the compounds with x=1 and x=0.15, respectively. We estimate the magnetic contribution of the neodymium subsystem to magnetization and specific heat using temperature dependences ...
Added: February 4, 2013
Popova E., Klimin S. A., Popova M. N. et al., [б.и.], 2018
The magnetic properties of (Y1-xNdx)2BaNiO5 with x = 0.01, 0.02, 0.03, 0.04, and 0.05 are investigated by means of specific heat, magnetic susceptibility, and spectroscopic measurements. We estimate a magnetic contribution of the neodymium subsystem into the magnetic susceptibility and specific heat using temperature dependencies of the splitting of the ground Kramers doublet of the ...
Added: October 3, 2018
Popova E., Vasil’ev A. N., Klimin S. A. et al., Журнал экспериментальной и теоретической физики 2010 Т. 138 № 2(8) С. 231-235
Исследованы температурные зависимости теплоемкости и спектры пропускания квазиодномерных халдейновских магнетиков (Y1-xNdx)2BaNiO5 (x = 1, 0.75, 0.50, 0.25). Во всех исследованных соединениях происходит магнитное упорядочение. В упорядоченном состоянии внутреннее магнитное поле приводит к расщеплению основного крамерсовского дублета иона Nd3+. Температурная зависимость величины расщепления, полученная из спектроскопических измерений, использовалась для расчета аномалии Шоттки на теплоемкости. В соединениях ...
Added: April 12, 2012
Popova E., Klimin S. A., Popova M. N. et al., Physical Review B: Condensed Matter and Materials Physics 2017
The magnetic properties of (Y1-xNdx)2BaNiO5 with different concentration of neodymium are investigated by means of specific heat, magnetic susceptibility, and spectroscopic measurements. We estimate a magnetic contribution of the neodymium subsystem into magnetic susceptibility and specific heat using temperature dependences of the splitting of the ground Kramers doublet of the Nd3+ ion obtained from spectroscopic ...
Added: December 7, 2016
Popova E., Klingeler R., Tristan N. et al., Physical Review B: Condensed Matter and Materials Physics 2012 Vol. 85 No. 17 P. 174402-174408
We present the thermodynamic properties and the magnetic phase diagram of Gd2BaNiO5 investigated by means of specific heat and magnetization measurements performed along the main crystallographic axes of the single crystal. Our data imply antiferromagnetic ordering at TN = 55 K and a spontaneous spin-reorientation transition at TSR = 24 K. Upon application of external ...
Added: October 1, 2012
Popova E., Klimin S. A., Popova M. N. et al., Journal of Low Temperature Physics 2016 Vol. 185 No. 5 P. 692-700
Magnetic properties of (Y1−xNdx )2BaNiO5 with x = 1; 0.25; 0.15; and 0.04 are investigated by means of specific heat, magnetic susceptibility, and spectroscopic measurements. We estimate a magnetic contribution of the neodymium subsystem into a total specific heat and magnetic susceptibility using spectroscopic data.We showthat the nickel subsystem is intrinsically disordered in thewhole temperature ...
Added: March 14, 2016
Popova E., Екомасов Е. Г., Известия Уфимского научного центра РАН 2021 № 1 С. 49-55
In a number of quasi-one-dimensional magnets, transition metal ions obeying the motives of the crystal lattice can form chains of integer spins that are distant from each other, named Haldane chains. This paper provides a brief overview of the magnetic properties of Haldane chains and considers some compounds containing such chains. The main features of ...
Added: December 28, 2020
Popova E., Vasil’ev A. N., Temerov V. et al., Journal of Physics: Condensed Matter 2010 Vol. 22 No. 11 P. 116006-116013
The present paper reports on the specific heat and magnetization of the YFe3(BO3)4 and ErFe3(BO3)4 single crystals. In both compounds, antiferromagnetic order of the iron spins evolves at TN = 38 K. The experimental data suggest that the magnetic moments are in the basal plane of the trigonal crystal for both compounds. In the magnetically ...
Added: April 12, 2012
Popova E., Никифоров А. В., Доклады Академии наук высшей школы Российской Федерации 2017 № 1 (34) С. 19-30
Disordered ground state with a gap in the spectrum of the magnetic excitation spectrum is realized in the compounds that contain the chains of the magnetic ions with S = 1 spins (Haldane chains). In framework of VBS model, each S = 1 spin can be represented as two pseudo-particle with S = 1/2 spins ...
Added: December 5, 2016
Kalmykov A., Melentiev P., Balykin V., Laser Physics Letters 2020 Vol. 17 No. 4 P. 045901
In this paper we present measurements and comparison of SPP propagation length at the practically important telecom wavelength (1560 nm) as well as in the near-infrared and visible spectral ranges. The measurements were carried out for plane SPP waves excited on Ag film surface using optical microscopy of SPP waves in the far field. We ...
Added: January 15, 2021
M. : Faculty of Physics, MSU, 2017
The Low Temperature Physics Conference is an international event held every three years, under the auspices of the IUPAP through its Commission C5 on Low Temperature Physics. The aim of these conferences is to exchange information and views among the members of the international scientific community in the general field of Low Temperature Physics. It ...
Added: October 1, 2017
Boldyrev K., Романов А., Хаула Е. et al., Journal of the American Ceramic Society 2019 Vol. 102 No. 5 P. 2745-2751
Single crystal of TlCl was doped with NIR photoluminescent univalent bismuth cations by prolonged immersion in liquid bismuth metal. The ion exchange Tl+ + Bi0 ↔ Tl0 + Bi+ at the crystal surface with subsequent Bi+ migration to the bulk are expected to drive the doping process. Contrary with Bi‐doped TlCl crystals, grown by Bridgman method, the ion exchange does ...
Added: February 8, 2019
Budkov Y., Kolesnikov A. L., Polymer Science - Series C 2018 Vol. 60 No. Supplement 1 P. 148-159
Theoretical models of the conformational behavior of flexible polymer chains in mixed solvents enunciated in the world literature during the last decade are critically reviewed. Models describing different mechanisms of coil-to-globule transitions in a good solvent induced by cosolvent addition are highlighted. Special attention is given to the analysis of theoretical approaches to describing the ...
Added: November 30, 2018
Antipov A., Seleznev V., Vakhtomin Y. et al., IOP Conference Series: Materials Science and Engineering (MSE) 2020 Vol. 781 No. 1 P. 012011-1-012011-5
Spectral characteristics of WSi and NbN superconducting single-photon detectors with different surface resistance and width of nanowire strips have been investigated in the wavelength range of 1.3-2.5 µm. WSi structures with narrower strips demonstrated better performance for detection of single photons in longer wavelength range. The difference in normalized photon count rate for such structures ...
Added: December 10, 2020
Казанцев Д. В., Казанцева Е. А., Кузнецов Е. В. et al., Известия РАН. Серия физическая 2017 Т. 81 № 12 С. 1709-1714
Описаны принципы работы безапертурного сканирующего микроскопа ближнего оптического поля (ASNOM). Зондом в приборе служит металлизированная игла атомно-силового микроскопа, и оптическое взаимодействие с объектами на поверхности локализовано вблизи ее острия размером в несколько нанометров. Тело иглы имеет длину в несколько микрон, и это обеспечивает высокую эффективность ее электромагнитного взаимодействия с падающими на нее извне и излучаемыми ...
Added: December 6, 2020
Bodrova A., Osinsky A., Brilliantov N., Scientific Reports 2020 Vol. 10 Article 693
We study analytically and numerically the distribution of granular temperatures in granular mixtures for
different dissipation mechanisms of inelastic inter-particle collisions. Both driven and force-free systems
are analyzed. We demonstrate that the simplified model of a constant restitution coefficient fails to
predict even qualitatively a granular temperature distribution in a homogeneous cooling state. At the
same time we reveal ...
Added: February 25, 2020
A.Aronin, Abrosimova G., Materials Letters 2017 Vol. 206 P. 64-66
To obtain a correct estimate of the microhardness dependence on the size of nanocrystals, the microhardness
of amorphous-nanocrystalline samples with the same fraction of the crystalline phase and the same
composition of the amorphous matrix but different sizes of nanocrystals was studied. It is shown that the
dependence of microhardness on the nanocrystal size in the size range ...
Added: February 22, 2018
K. I. Kugel, Bianconi A., Poccia N. et al., Superconductor Science and Technology 2015 Vol. 28 No. 2 P. 024005-1-024005-8
The arrested nanoscale phase separation in a two-band Hubbard model for strongly correlated charge carriers is shown to occur in a particular range in the vicinity of the topological Lifshitz transition, where the Fermi energy crosses the bottom of the narrow band and a new sheet of the Fermi surface related to the charge carriers ...
Added: March 12, 2016
Бланк В. Д., Boldyrev K., Денисов В. Н. et al., Physical Review B: Condensed Matter and Materials Physics 2020 Vol. 102 P. 115153-1-115153-10
The electronic band structure of the phosphorus-doped high-quality high-pressure and high-temperature–
grown single crystal diamond was studied by infrared absorption, magneto- and electron paramagnetic resonance
spectroscopy, and first-principles calculations. The complete picture of the 1s → np± and 1s → np0 (n = 2, 3,
4) donor transitions with new 1s →3p0,4p0 and 1s →4p± transitions allowed us ...
Added: October 22, 2020
Ермилов А. И., Ivashov E., Международный журнал экспериментального образования 2014 № 1 С. 98-101
Devices of nanorelocation with the probes, the executing operations necessary for formation of quantum points are developed. Options of execution of devices are shown. ...
Added: January 20, 2014
Dziom V., Shuvaev A. V., Shchepetilnikov A. et al., Physical Review B: Condensed Matter and Materials Physics 2019 Vol. 99 No. 4 Article 045305
The integer quantum Hall effect is a well-studied phenomenon at frequencies below about 100 Hz. The plateaus in high-frequency Hall conductivity were experimentally proven to retain up to 33 GHz, but the behavior at higher frequencies has remained largely unexplored. Using continuous-wave terahertz spectroscopy, the complex Hall conductivity of GaAs/AlGaAs heterojunctions was studied in the ...
Added: December 11, 2020
Демин А. С., Масляев С. А., Пименов В. Н. et al., Физика и химия обработки материалов 2017 № 6 С. 5-17
Изучено влияние облучения в установке Плазменный фокус PF-1000 экстремальными энергетическими потоками быстрых ионов дейтерия (Ei≈100 кэВ, плотность мощности qi≈1011-1012 Вт/см2, длительность импульса ti≈10-50 нс) и дейтериевой плазмы (qpl≈109- 1010 Вт/см2, tpl≈50-100 нс) на структуру поверхностного слоя молибденовой пластины с учетом его плавления, частичного испарения и закалки расплава. На облученной поверхности обнаружено образование капельных структур, пор, ...
Added: December 25, 2017
Kuzmichev S. A., Kuzmicheva T. E., Tchesnokov S. N. et al., Journal of Superconductivity and Novel Magnetism 2016 Vol. 29 No. 4 P. 1111-1116
We present temperature dependences of the large and the small superconducting gaps measured directly by SnS-Andreev spectroscopy in various Fe-based superconductors and MgB2. The experimental L,S(T ) are wellfitted with a two-gap model based on Moskalenko and Suhl system of equations (supplemented with a BCS integral renormalization). From the fitting procedure, we estimate the key ...
Added: March 19, 2016
Kuzmin N. N., Maltsev V. V., Volkova E. A. et al., Inorganic Materials 2020 Vol. 56 No. 8 P. 828-835
We have studied and optimized conditions for spontaneous flux growth of TbCr3(BO3)4 crystals.
Phase relations in the pseudoternary system TbCr3(BO3)4–K2Mo3O10–B2O3 have been studied in the temperature
range 900–1130°C and the single-phase terbium chromium borate crystallization field has been
mapped out. It has been shown that increasing the TbCr3(BO3)4 content of the starting high-temperature
solution leads to a rhombohedral-to-monoclinic phase ...
Added: October 22, 2020