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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Беляев, Борис Афанасьевич, Тюрнев, Владимир Вениаминович
Заглавие : Формулы электродинамики для сред с отрицательной диэлектрической проницаемостью
Колич.характеристики :13 с
Место публикации : Ural Radio Eng. J. - 2023. - Vol. 7, Is. 4. - P.457-469. - ISSN 25880454 (ISSN), DOI 10.15826/urej.2023.7.4.006. - ISSN 25880462 (eISSN)
Примечания : Cited References: 15
Аннотация: Формулы электродинамики, широко используемые при описании объектов, содержащих диэлектрические среды, дают противоречащие физике результаты в случае, когда диэлектрическая проницаемость среды принимает отрицательное значение. Проблему снимают уточненные формулы, позволяющие рассчитывать электрические потенциалы точечного заряда и точечного дипольного момента, емкость конденсатора, а также плотность энергии электромагнитного поля и добротность материала. Формулы справедливы для любых сред, как с положительной, так и с отрицательной действительной частью комплексной диэлектрической проницаемости.Electrodynamic formulas widely used in the description of objects containing dielectric media give results contrary to physics in the case when the permittivity of the medium takes a negative value. The problem is solved by refined formulas that allow calculating the electric potentials of the point charge and the point dipole moment, the capacitance of the capacitor, as well as the energy density of the electromagnetic field and the quality factor of the material. The formulas are valid for any media, both with positive and negative real part of the complex permittivity.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Каравайский, Андрей Юрьевич, Миронов, Валерий Леонидович
Заглавие : Применимость концепции вымерзания незамерзшей воды в мерзлой почве для расчета зависимости диэлектрической проницаемости от влажности и температуры
Коллективы : "Решетневские чтения", международная научная конференция (16; 2012 ; нояб. ; 7-9; Красноярск)
Место публикации : Решетневские чтения: матер. XVI Междунар. науч. конф. : в 2 ч. - Красноярск, 2012. - Ч. 1. - С. 210-212. - ISBN 1990-7702
Аннотация: На основе измерений спектров комплексной диэлектрической проницаемости влажной почвы показано, что применение концепции вымерзания незамерзшей воды в мерзлой почве дает погрешности до 100 % при расчетах показателя преломления. Доказано, что такая существенная ошибка возникает за счет присутствия в почве различных типов незамерзшей воды.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Беляев, Борис Афанасьевич, Изотов, Андрей Викторович
Заглавие : Микромагнитный расчет магнитостатических мод колебаний ортогонально намагниченного диска железо-иттриевого граната
Место публикации : Физ. тверд. тела: Физико-технический институт им. А.Ф.Иоффе РАН, 2013. - Т. 55, Вып. 12. - С. 2370-2378. - ISSN 0367-3294
Примечания : Работа выполнена при финансовой поддержке Министерства образования и науки РФ (государственный контракт N 14.513.11.0010), Федеральной целевой программы "Научные и научно-педагогические кадры инновационной России (2009-2013 гг.)" и интеграционного проекта СО РАН N 109.
Аннотация: В диапазоне частот 0.0001-100 MHz исследовано поведение спектров импеданса островковых пермаллоевых пленок, полученных вакуумным напылением на оптически полированные подложки из ситалла. Разработана резистивно-емкостная модель пленок и определены ее параметры, для которых наблюдается хорошее согласие с экспериментальными результатами частотных зависимостей действительной и мнимой компонент импеданса. Изучены закономерности в поведении электрофизических характеристик при изменении толщины образцов и величины зазора между измерительными электродами. Определены величины относительной диэлектрической проницаемости исследуемых пленок, достигающие значений varepsilon~ 10˄7-10˄8, и вычислены времена релаксации структуры.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Izotov A. V., Belyaev B. A., Solovev P. N., Boev N. M.
Заглавие : Two-Magnon Relaxation Processes in Nanocrystalline Thin Magnetic Films
Коллективы : Russian Ministry of Education and Science [3.1031.2017/PCh]
Место публикации : Russ. Phys. J. - 2019. - Vol. 61, Is. 12. - P.2313-2320. - ISSN 1064-8887, DOI 10.1007/s11182-019-01673-4. - ISSN 1573-9228(eISSN)
Примечания : Cited References: 25. - This research was done with support of the Russian Ministry of Education and Science, task No. 3.1031.2017/PCh.
Предметные рубрики: FERROMAGNETIC-RESONANCE LINEWIDTH
MICROMAGNETIC CALCULATION
SCATTERING
Аннотация: Numerical analysis of the micromagnetic model was used to reveal the ‘resonance’ feature of relaxation processes in nanocrystalline thin magnetic films. This feature manifests itself in the form of sharp broadening of the ferromagnetic resonance (FMR) line at a certain frequency f1 depending on magnetic characteristics of the film, and is observed only in films the thickness of which exceeds some threshold value dmin. Sharp broadening of the FMR line is accompanied by significant shift of the resonance field, whereas the shift value changes the sign at frequency ~ f1. It was shown analytically that the nature of observed effects is associated with the two-magnon process of spin waves scattering on quasi-periodic magnetic microstructure – magnetization ‘ripple’. Obtained expressions for the threshold value of film thickness dmin and frequency of maximum broadening of FMR line f1 agree well with the results of numerical computation of micromagnetic model.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuklin A. V., Kuzubov A. A., Kovaleva E. A., Mikhaleva N. S., Tomilin F. N., Lee H., Avramov P. V.
Заглавие : Two-dimensional hexagonal CrN with promising magnetic and optical properties: A theoretical prediction
Место публикации : Nanoscale: Royal Society of Chemistry, 2017. - Vol. 9, Is. 2. - P.621-630. - ISSN 20403364 (ISSN), DOI 10.1039/c6nr07790k
Примечания : Cited References: 76. - We acknowledge the Siberian Supercomputer Center (SSCC) of SB RAS, Novosibirsk; the Institute of Computational Modeling of SB RAS, Krasnoyarsk; the Joint Supercomputer Center of RAS, Moscow; and the ICC of Novosibirsk State University for providing the computing resources. This work was supported by the government contract of the Ministry of Education and Science of the Russian Federation to Siberian Federal University (Grant No. 16.1500.2014/K). P. V. A. acknowledges the Kyungpook National University Research Fund, 2014. N. S. M. acknowledges the Russian Foundation for Basic Research (RFBR 16-32-60003 mol_a_dk).
Ключевые слова (''Своб.индексиров.''): boron nitride--calculations--energy gap--ferromagnetic materials--ferromagnetism--graphene--magnetism--metals--transition metals--transparency--dielectric functions--ferromagnetic orderings--first-principles calculation--half-metallic properties--magnetic and optical properties--optical transparency--spintronics application--transition metal dichalcogenides--optical properties
Аннотация: Half-metallic ferromagnetic materials with planar forms are promising for spintronics applications. A wide range of 2D lattices like graphene, h-BN, transition metal dichalcogenides, etc. are non-magnetic or weakly magnetic. Using first principles calculations, the existence of graphene-like hexagonal chromium nitride (h-CrN) with an almost flat atomically thin structure is predicted. We find that freestanding h-CrN has a 100% spin-polarized half-metallic nature with possible ferromagnetic ordering and a high rate of optical transparency. As a possible method for stabilization and synthesis, deposition of h-CrN on 2D MoSe2 or on MoS2 is proposed. The formation of composites retains the half-metallic properties and leads to the reduction of spin-down band gaps to 1.43 and 1.71 eV for energetically favorable h-CrN/MoSe2 and h-CrN/MoS2 configurations, respectively. Calculation of the dielectric functions of h-CrN, h-CrN/MoSe2 and h-CrN/MoS2 exhibit the high transparency of all three low-dimensional nanomaterials. The honeycomb CrN may be considered as a promising fundamental 2D material for a variety of potential applications of critical importance. © The Royal Society of Chemistry 2017.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Zlotnikov A. O.
Заглавие : Topological phase of coexisting superconductivity and 120-degree magnetic order on a triangular lattice
Место публикации : Bull. Russ. Acad. Sci. Phys. - 2018. - Vol. 82, Is. 5. - P.588-590. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873818050325
Примечания : Cited References: 12. - This study was supported by the Russian Foundation for Basic Research, the Government of Krasnoyarsk krai, and the Krasnoyarsk Territorial Foundation for Science and Technology, project nos. 16-02-00073, 17-42-240441, and 16-42-243069. A.O. Zlotnikov acknowledges the support of the RF Presidential Grant Council, project nos. SP-1370.2015.5 and MK-1398.2017.2.
Ключевые слова (''Своб.индексиров.''): linear combinations--nontrivial topology--self-consistent calculation--spin wave approximation--sublattice magnetization--superconducting order parameters--topological phase--triangular lattice
Аннотация: Using the t–J–V model, self-consistent calculations of the superconducting order parameter described by a linear combination of dx2−y2+idxy and p x + ip y chiral invariants are performed in the phase of coexistence with 120-degree magnetic ordering. Sublattice magnetization is determined in the spin-wave approximation for the case of half-filling. A nontrivial topology of the coexistence phase is demonstrated, testifying to the possibility of obtaining edge states and Majorana modes.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zinenko V. I., Sofronova S. N.
Заглавие : The nonempirical calculation of the cation ordering and lattice dynamics in the solid solutions of PbSc1/2Nb1/2O3 and PbSc1/2Ta1/2O3
Место публикации : 11th International Conference on Phonon Scattering in Condensed Matter (PHONONS 2004) (JUL 25-30, 2004, St Petersburg, RUSSIA): WILEY-V C H VERLAG GMBH, 2004. - P3047-3051. - ISBN 3-527-40588-7, DOI 10.1002/pssc.200405286
Примечания : Cited References: 10
Аннотация: An effective Hamiltonian for the study of Sc-Nb(Ta) cation ordering in PbSc1/2Nb(Ta)(1/2)O-3 solid solutions is written out. To determine the parameters of the effective Hamiltonian, a nonempirical calculation is performed within an ionic-crystal model taking into account the deformation, dipole and quadrupole polarizabilities of ions. The phase transition temperatures are calculated by mean field, cluster approximations and Monte-Carlo method. Within the same ionic-crystal model, we calculated the high-frequency permittivity, Born dynamic charges, and the phonon spectrum for a completely disordered and ordered phases. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhandun V. S., Zinenko V. I.
Заглавие : The effect of structural ordering on the magnetic, electronic, and optical properties of the LaPbMnSbO6 double perovskite
Коллективы : Russian Foundation for Basic Research [15-02-00340-a]; Russian Federation [NSH-924.2014.2]
Место публикации : J. Alloys Compd.: Elsevier Science, 2016. - Vol. 671. - P.184-191. - ISSN 0925-8388, DOI 10.1016/j.jallcom.2016.02.085. - ISSN 1873-4669(eISSN)
Примечания : Cited References:32. - This work was supported by the Russian Foundation for Basic Research, project no. 15-02-00340-a and the Grant of the President of the Russian Federation for Support of Leading Scientific Schools no. NSH-924.2014.2.
Предметные рубрики: SYSTEMS
NI
CO
Ключевые слова (''Своб.индексиров.''): ab initio calculation--double perovskite--magnetic materials--optical--properties--electronic properties--magnetic properties--layer compound
Аннотация: The interplay between the magnetic, electronic, and optical properties and the cation structural ordering in the LaPbMnSbO6 double perovskite is studied using the Vienna Ab Initio Simulation Package (VASP). The layer and rock-salt cation ordering types are investigated. Both of them are of great importance. The rock-salt ordering of B-site cations is one of the most frequently met cation ordering types in double perovskites; the layer ordering of both cations, which can be considered as a heterostructure, is interesting for fundamental research and experimental synthesis. It was established that the properties of the two investigated structures are strongly different. The compound with the layered structure exhibits the behavior typical of a semimetal with the ferromagnetic configuration of magnetic moments, which is unusual for a double perovskite. The rock-salt structure behaves as an antiferromagnetic insulator. Another surprising feature of the structure with the layer ordering is the coexistence of a polar phase and the metal-type conductivity. The calculated optical characteristics of the two ordered structures are compared with the experimental dates. (C) 2016 Elsevier B.V. All rights reserved.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zamkova N. G., Zhandun V. S., Sandalov I. S.
Заглавие : The changing of magnetic and electronic structure of iron silicides Fe3Si and α-FeSi2with different substitution
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Институт физики им. Л.В. Киренского Сибирского отделения РАН
Место публикации : VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016): abstracts/ ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk: KIP RAS SB, 2016. - Ст.P3.11. - P.193. - ISBN 978-5-904603-06-9 (Шифр -478014040)
Примечания : References: 1
Ключевые слова (''Своб.индексиров.''): iron silicides--magnetic and electronic structure--ab initio calculation
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Iuzhakov A. P.
Заглавие : The calculation of the complete sum of residues relative to a polynomial mapping in CN
Место публикации : Doklady Akademii Nauk. - 1984. - Vol. 275, Is. 4. - P.817-820. - ISSN 0002-3264
Примечания : Cited References: 9
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Tyurnev V. V., Izotov A. V., Leksikov Al. A.
Заглавие : Study of the fields scattered by a periodic strip structure of thin magnetic films
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2016. - Vol. 58, Is. 1. - P.55-61. - ISSN 10637834 (ISSN), DOI 10.1134/S1063783416010054
Примечания : Cited References: 14. - This study was performed at the Siberian Federal University and was supported by the Ministry of Education and Science of the Russian Federation (state task for 2014-2016, project no. 3.528.2014K).
Предметные рубрики: GIANT MAGNETORESISTANCE
MICROMAGNETIC CALCULATION
Аннотация: Components of the fields scattered by a periodic planar strip structure of thin magnetic films possessing a uniaxial magnetic anisotropy in the plane have been calculated using the phenomenological model. Regularities in the dependence of these fields on the design parameters of the structure have been studied. The results obtained agree with the numerical analysis of the micromagnetic model of this structure. It has been shown that, near the edges of strips magnetized orthogonally to the major axis, the components of the scattered field can exceed the external magnetizing field by a few orders of magnitude. This fact makes it possible to design highly efficient magnetoresistive elements on the basis of a strip structure of magnetic films and thin semiconductor films. © 2016, Pleiades Publishing, Ltd.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Boev N. M., Izotov A. V., Solovev P. N.
Заглавие : Study of Peculiarities of the Microwave Absorption Spectrum of Nanocrystalline Thin Magnetic Films
Коллективы : Ministry of Education and Science of the Russian Federation [RFMEFI60417X0179]
Место публикации : Russ. Phys. J. - 2019. - Vol. 61, Is. 10. - P.1798-1805. - ISSN 1064-8887, DOI 10.1007/s11182-019-01603-4. - ISSN 1573-9228(eISSN)
Примечания : Cited References: 22. - This work was supported by the Ministry of Education and Science of the Russian Federation, project No. RFMEFI60417X0179.
Предметные рубрики: MICROMAGNETIC CALCULATION
SIMULATIONS
PARTICLES
MODES
Ключевые слова (''Своб.индексиров.''): micromagnetic modeling--nanocrystallites--random magnetic anisotropy--ferromagnetic resonance--microwave
Аннотация: Based on the micromagnetic model which takes into account the random distribution of the uniaxial magnetic anisotropy directions in crystallites of a nanocrystalline film, an effective method has been implemented for calculation of the magnetization dynamics in microwave fields. For a certain range of crystallite sizes, when the energy of the random magnetic anisotropy is comparable to the exchange energy, a significant change of the ferromagnetic resonance field, broadening of the resonance line, and the appearance of an asymmetry in the shape of the resonance curve were found. With an increase of the crystallite sizes, the resonance field first grows, then, it quickly decreases to its minimum, and then, it grows again to reach saturation. In this case, the steepness of the left slope of the broadening resonance curve first decreases faster than that of the right slope, leading to the symmetry breaking of the resonance curve shape, then, the curve becomes symmetrical again, and then, the steepness of the left slope becomes greater than that of the right slope.
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13.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Krylova S. N., Krylov A. S., Roginskii E. M.
Заглавие : Structural properties and lattice dynamics of HoFe3(BO3)4, HoGa3(BO3)4crystals: ab initio calculation
Коллективы : IEEE International Symposium on Applications of Ferroelectrics, International Conference on ElectroCeramics, European Meeting on Ferroelectricity, International Workshop on PiezoMEMS, Piezoresponse Force Microscopy Workshop
Место публикации : European Meeting on Ferroelectricity (14 ; 2019 ; 14-19 July ; Lausanne, Switzerland). Joint Conference of the IEEE ISAF, EMF, ICE, IWPM and PFM: Abstract book. - 2019. - P.691
Примечания : Cited References: 4. - This work is financially supported by the Russian Foundation for Basic Research № 18-02-00754
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sidorov K. A., Ovchinnikov S. G., Tikhonov N. V.
Заглавие : Simple method for exact calculation of thermodynamic properties of the 1D Hubbard model with infinite repulsion
Место публикации : J. Experim. Theor. Phys. - 2013. - Vol. 116, Is. 2. - P.330-337. - DOI 10.1134/S1063776113020167
Аннотация: It is shown that the canonical partition function in the 1D Hubbard model with U = ∞ in the near-est neighbor approximation is determined by the product of canonical partition functions of spinons andholons. In this approximation, the concentration and temperature dependences of the free and internal ener gies, as well as of the chemical potential, entropy, and heat capacity, are calculated for electron concentrations of 0 ≤ n[[d]]e[[/d]] ˂ 1
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tarasov I. A., Visotin M. A., Aleksandrovsky A. S., Kosyrev N. N., Yakovlev I. A., Molokeev M. S., Lukyanenko A. V., Krylov A. S., Fedorov A. S., Varnakov S. N., Ovchinnikov S. G.
Заглавие : Si/Fe flux ratio influence on growth and physical properties of polycrystalline β-FeSi2 thin films on Si(100) surface
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Институт физики им. Л.В. Киренского Сибирского отделения РАН , Russian Science Foundation [16-13-00060]
Место публикации : J. Magn. Magn. Mater.: Elsevier Science, 2017. - Vol. 440. - P.144-152. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2016.12.084. - ISSN 1873-4766(eISSN)
Примечания : Cited References:39. - This work was supported by the Russian Science Foundation, project no. 16-13-00060
Предметные рубрики: SEMICONDUCTING FESI2 FILMS
SPECTROSCOPIC ELLIPSOMETRY
EPITAXIAL-FILMS
Ключевые слова (''Своб.индексиров.''): β-fesi2 iron disilicide--optical properties--reflection high-energy--electron diffraction--raman spectroscopy--ab initio calculation
Аннотация: This work investigates the Si/Fe flux ratio (2 and 0.34) influence on the growth of β-FeSi2 polycrystalline thin films on Si(100) substrate at 630 °C. Lattice deformations for the films obtained are confirmed by X-ray diffraction analysis (XRD). The volume unit cell deviation from that of β-FeSi2 single crystal are 1.99% and 1.1% for Si/Fe =2 and Si/Fe =0.34, respectively. Absorption measurements show that the indirect transition (~ 0.704 eV) of the Si/Fe =0.34 sample changes to the direct transition with a bandgap value of ~0.816 eV for the sample prepared at Si/Fe =2. The absorption spectrum of the Si/Fe =0.34 sample exhibits an additional peak located below the bandgap energy value with the absorption maximum of ~0.36 eV. Surface magneto-optic Kerr effect (SMOKE) measurements detect the ferromagnetic behavior of the β-FeSi2 polycrystalline films grown at Si/Fe =0.34 at T=10 K, but no ferromagnetism was observed in the samples grown at Si/Fe =2. Theoretical calculations refute that the cell deformation can cause the emergence of magnetization and argue that the origin of the ferromagnetism, as well as the lower absorption peak, is β-FeSi2 stoichiometry deviations. Raman spectroscopy measurements evidence that the film obtained at Si/Fe flux ratio equal to 0.34 has the better crystallinity than the Si/Fe =2 sample.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shorikov A., Korshunov M. M., Anisimov V. I.
Заглавие : Role of electronic correlations in the Fermi surface formation of Na (x) CoO2
Разночтения заглавия :авие SCOPUS: Role of electronic correlations in the Fermi surface formation of Na xCoO 2
Место публикации : JETP Letters. - 2011. - Vol. 93, Is. 2. - P.80-85. - ISSN 0021-3640, DOI 10.1134/S0021364011020123
Примечания : Cited References: 36. - The authors thank I. Eremin, M. Laad, and S. G. Ovchinnikov for useful discussions. A. S. and V. I. A. acknowledge the support of the Russian Foundation for Basic Research (project nos. 10-02-00046-a, 09-02-00431-a, and 10-02-00546-a), the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project nos. NSh-1941.2008.2 and MK-3758.2010.2), the Presidium of the Russian Academy of Science (programs "Quantum Microphysics of Condensed Matter" N7 and "Strongly Compressed Materials"), and the Russian Federal Agency for Science and Innovations (project no. 02.740.11.0217). M. M. K. acknowledges the support of INTAS (YS Grant no. 05-109-4891); the Russian Foundation for Basic Research (project nos. 09-02-00127, 06-02-16100, and 06-02-90537-BNTS); the Siberian Branch, Russian Academy of Sciences (integration program no. 40); the Presidium of the Russian Academy of Sciences (program no. 5.7); the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project no. MK-1683.2010.2); and the Ministry of Education and Science of the Russian Federation (project no. R891, federal program "Scientific and Pedagogical Personnel of Innovative Russia for 2009-2013").
Предметные рубрики: DENSITY-FUNCTIONAL CALCULATION
METALS
SPIN
Аннотация: Band structure of metallic sodium cobaltate Na (x) CoO2 (x = 0.33, 0.48, 0.61, 0.72) has been investigated by local density approximation + Hubbard U (LDA+U) method and within Gutzwiller approximation for the Co-t (2g) manifold. Correlation effects being taken into account results in suppression of the e' (g) hole pockets at the Fermi surface in agreement with recent angle-resolved photoemission spectroscopy (ARPES) experiments. In the Gutzwiller approximation the bilayer splitting is significantly reduced due to the correlation effects. The formation of high spin (HS) state in Co d-shell was shown to be very improbable.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhang, Xingyu, Liu, Youquan, Molokeev M. S., Xu, Bohui, Jiang, Xingxing, Lin, Zheshuai
Заглавие : Realizing persistent zero area compressibility over a wide pressure range in Cu2GeO4 by microscopic orthogonal-braiding strategy
Колич.характеристики :6 с
Место публикации : Angew. Chem. Int. Ed. - 2024. - Vol. 63, Is. 7. - Ст.e202318401. - ISSN 14337851 (ISSN), DOI 10.1002/anie.202318401. - ISSN 15213773 (eISSN)
Примечания : Cited References: 24. - The authors would like to acknowledge Zhuohong Yin for useful discussions and experimental time for the 4W2 beamline in the Beijing synchrotron radiation facility (BSRF). This work was supported by the National Scientific Foundations of China (Grants T2222017, 12274425, 22133004, 11974360 and 51890864) and the CAS Project for Young Scientists in Basic Research (YSBR-024). M.S. Molokeev would like to acknowledge support fromthe Ministry of Science and High Education of the Russian Federation (Project No. FSRZ-2023-0006)
Аннотация: Zero area compressibility (ZAC) is an extremely rare mechanical response that exhibits an invariant two-dimensional size under hydrostatic pressure. All known ZAC materials are constructed from units in two dimensions as a whole. Here, we propose another strategy to obtain the ZAC by microscopically orthogonal-braiding one-dimensional zero compressibility strips. Accordingly, ZAC is identified in a copper-based compound with a planar [CuO4] unit, Cu2GeO4, that possesses an area compressibility as low as 1.58(26) TPa-1 over a wide pressure range from ~0 GPa to 21.22 GPa. Based on our structural analysis, the subtle counterbalance between the shrinkage of [CuO4] and the expansion effect from the increase in the [CuO4]-[CuO4] dihedral angle attributes to the ZAC response. High-pressure Raman spectroscopy, in combination with first-principles calculations, shows that the electron transfer from in-plane bonding dx2-y2 to out-of-plane nonbonding dz2 orbitals within copper atoms causes the counterintuitive extension of the [CuO4]-[CuO4] dihedral angle under pressure. Our study provides an understanding on the pressure-induced structural evolution of copper-based oxides at an electronic level and facilitates a new avenue for the exploration of high-dimensional anomalous mechanical materials.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhang, Xingyu, Liu, Youquan, Molokeev M. S., Xu, Bohui, Jiang, Xingxing, Lin, Zheshuai
Заглавие : Realizing persistent zero area compressibility over a wide pressure range in Cu2GeO4 by microscopic orthogonal-braiding strategy
Колич.характеристики :6 с
Место публикации : Angew. Chem. - 2024. - Vol. 136, Is. 7. - Ст.e202318401. - ISSN 00448249 (ISSN), DOI 10.1002/ange.202318401. - ISSN 15213757 (eISSN)
Примечания : Cited References: 24. - The authors would like to acknowledge Zhuohong Yin for useful discussions and experimental time for the 4W2 beamline in the Beijing synchrotron radiation facility (BSRF). This work was supported by the National Scientific Foundations of China (Grants T2222017, 12274425, 22133004, 11974360 and 51890864) and the CAS Project for Young Scientists in Basic Research (YSBR-024). M.S. Molokeev would like to acknowledge support fromthe Ministry of Science and High Education of the Russian Federation (Project No. FSRZ-2023-0006)
Аннотация: Zero area compressibility (ZAC) is an extremely rare mechanical response that exhibits an invariant two-dimensional size under hydrostatic pressure. All known ZAC materials are constructed from units in two dimensions as a whole. Here, we propose another strategy to obtain the ZAC by microscopically orthogonal-braiding one-dimensional zero compressibility strips. Accordingly, ZAC is identified in a copper-based compound with a planar [CuO4] unit, Cu2GeO4, that possesses an area compressibility as low as 1.58(26) TPa-1 over a wide pressure range from ≈0 GPa to 21.22 GPa. Based on our structural analysis, the subtle counterbalance between the shrinkage of [CuO4] and the expansion effect from the increase in the [CuO4]-[CuO4] dihedral angle attributes to the ZAC response. High-pressure Raman spectroscopy, in combination with first-principles calculations, shows that the electron transfer from in-plane bonding dx2-y2 to out-of-plane nonbonding dz2 orbitals within copper atoms causes the counterintuitive extension of the [CuO4]-[CuO4] dihedral angle under pressure. Our study provides an understanding on the pressure-induced structural evolution of copper-based oxides at an electronic level and facilitates a new avenue for the exploration of high-dimensional anomalous mechanical materials.
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19.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Krylova S. N., Chernyshev V. А., Ruseikina A. V., Grigoriev M. V., Aleksandrovskiy A. S., Krylov A. S.
Заглавие : Raman spectroscopy of SrLnCuS3 (Ln = La, Nd, Tm): experiment and ab initio calculation
Коллективы : International Feofilov symposium on spectroscopy of crystals doped with rare earth and transition metal ions, Физический институт им. П.Н. Лебедева РАН, Институт спектроскопии РАН
Место публикации : XVIII International Feofilov symposium on spectroscopy of crystals doped with rare earth and transition metal ions (IFS-2022): book of abstracts : Aug. 22-27, 2022, Moscow, Russia. - 2022. - P.71-72. - ISBN 978-5-89513-513-6
Примечания : Библиогр.: 8. - The work of Krylova S. was financially supported by the Russian Foundation for Basic Research and DFG project number No 21-52-12018. The research of Ruseikina A. was supported by the Tyumen region within the framework of the grant agreement in the form of a grant to non-profit organizations no. 89-don dated 07.12.2020. Chernyshev V. thanks the Ministry of Science and Higher Education of the Russian Federation (project no. FEUZ-2020-0054) for financial support.
Аннотация: The Raman spectra of SrLaCuS3, SrNdCuS3, SrTmCuS3 compounds have been investigated. Ab initio calculations of the crystal structure and phonon spectrum of the compounds have been carried out. The types and wave numbers of the fundamental modes have been determined. The experimental Raman spectra have been interpreted.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krylov A. S., Pavlovskiy M. S., Kitaev Y., Gudim I. A., Andryshin N. D., Vtyurin A. N., Jiang, Qinghui, Krylova S. N.
Заглавие : Phase transitions and p–T phase diagram of the multiferroic TbFe3(BO3)4 crystal
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); RFBR, Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science [20-42-240009]; Russian Foundation for Basic Research and DFG (Deutsche Forschungsgemeinschaft)German Research Foundation (DFG) [448809307, 21-52-12018]
Место публикации : J. Raman Spectrosc. - 2022. - Vol. 53, Is. 6. - P.1179-1187. - ISSN 0377-0486, DOI 10.1002/jrs.6341. - ISSN 1097-4555(eISSN)
Примечания : Cited References: 48. - Russian Foundation for Basic Research; RFBR, Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science, Grant/Award Number: 20-42-240009; Russian Foundation for Basic Research and DFG (Deutsche Forschungsgemeinschaft), Grant/Award Numbers: 448809307, 21-52-12018
Предметные рубрики: BILBAO CRYSTALLOGRAPHIC SERVER
RAMAN-SPECTRA
HIGH-TEMPERATURE
Аннотация: The structural phase transitions in multiferroic TbFe3(BO3)4 with change hydrostatic pressures and temperatures have been studied by Raman spectroscopy and calculation within density functional theory. Lattice dynamics calculations in the TbFe3(BO3)4 crystal in the ��32 phase under various values of applied hydrostatic pressure (from 0 up to 5 GPa with 1 GPa step) were performed. The calculation performed in this work in a TbFe3(BO3)4 crystal showed that the applied pressure can increase the phase transition temperature. Raman spectra of the TbFe3(BO3)4 crystal have been investigated at simultaneously high temperature and high pressure (up to 5.14 GPa and 465 K). The appearance of a soft mode was observed with decreasing temperature at normal pressure. The manifestations of the interaction of the structural and magnetic order parameters in the range from 13 to 50 K were observed at normal pressure. With increasing pressure and a fixed temperature, recovery of the soft modes is also observed. The experimental p–T phase diagram of TbFe3(BO3)4 was established. An increase in pressure leads to an increase in the temperature of transition.
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