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Исследование теплового расширения и теплоемкости керамики CaCu[[d]]3[[/d]]Ti4O[[d]]12[[/d]] / М. В. Горев [и др.] // Физ. тверд. тела. - 2012. - Т. 54, Вып. 9. - С. 1675-1679 . - ISSN 0367-3294
Аннотация: Выполнены измерения теплового расширения керамики CaCu3Ti4O12 в широком интервале температур 120-1200 K. Качество исследованных образцов подтверждается хорошим согласием результатов измерений теплоемкости в интервале 2-300 K и в окрестности фазового перехода магнитной природы при 25 K с данными для монокристалла. Аномалий в тепловом расширении, которые могли бы быть связаны с предполагавшимся другими исследователями фазовым переходом при 726-732 K, обнаружено не было. Исследовано влияние на тепловое расширение термической обработки образца в атмосфере гелия и на воздухе. Работа выполнена при поддержке гранта президента РФ по поддержке ведущих научных школ РФ (НШ-4828.2012.2).

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Переводная версия Investigation of the thermal expansion and heat capacity of the CaCu[[d]]3[[/d]]Ti[[d]]4[[/d]]O[[d]]12[[/d]] ceramics. - [Б. м. : б. и.]

Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Горев, Михаил Васильевич; Gorev M.V.; Флёров, Игорь Николаевич; Flerov, I. N.; Карташев, Андрей Васильевич; Kartashev A.V.; Guillemet-Fritsch, S.
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Zobov, V. E.
Tree growth parameter in the Eden model on face-centered hypercubic lattices / V. E. Zobov, M. A. Popov // Theor. Math. Phys. - 2005. - Vol. 144, Is. 3. - P. 1361-1371, DOI 10.1007/s11232-005-0165-z. - Cited References: 19 . - ISSN 0040-5779

РУБ Physics, Multidisciplinary + Physics, Mathematical
Рубрики:
BRANCHED POLYMERS
   HIGH-TEMPERATURES
   EXPANSION
   CLUSTERS
   SYSTEMS
   TIME
Кл.слова (ненормированные):
Eden model -- number of lattice trees -- Monte Carlo method -- growth parameter -- singular points of generating function -- large-dimension expansion -- face-centered hypercubic lattice -- Eden model -- Face-centered hypercubic lattice -- Growth parameter -- Large-dimension expansion -- Monte Carlo method -- Number of lattice trees -- Singular points of generating function
Аннотация: In the Eden model, we investigate how the tree growth parameter depends on the space dimension d for face-centered hypercubic lattices. We find the first three terms of the 1/d-expansion for this parameter directly from the generating function without calculating the number of trees because the growth parameter is the reciprocal coordinate of the singular point of the tree generating function. The same growth parameter was calculated by computer experiment where the ratios between the numbers of trees without intersections and trees without restrictions in the dimensions 3, 4, 6, 8, and 10 were estimated by the Monte Carlo method on face-centered cubic lattices. The results of the two methods agree well. Comparing with the previously performed computer experiment for simple hypercubic lattices, we observe that the values of the singular exponents for the tree generating functions are close for two different types of lattices.

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Держатели документа:
RAS, Siberian Branch, Kirenskii Inst Phys, Novosibirsk, Russia
Krasnoyarsk State Univ, Krasnoyarsk, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Branch, RAS, Russian Federation
Krasnoyarsk State University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Popov, M. A.; Зобов, Владимир Евгеньевич
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Zobov, V. E.
The coordinate of the singular point of generating functions of clusters in the high-temperature dynamics of spin lattice systems with axially symmetric interaction / V. E. Zobov, M. A. Popov // Theor. Math. Phys. - 2003. - Vol. 136, Is. 3. - P. 1297-1311, DOI 10.1023/A:1025603416535. - Cited References: 25 . - ISSN 0040-5779

РУБ Physics, Multidisciplinary + Physics, Mathematical
Рубрики:
CONSISTENT FLUCTUATING FIELD
   NUCLEAR-DOUBLE-RESONANCE
   HEISENBERG PARAMAGNET
   LINE SHAPE
   RELAXATION
   SPECTRUM
   APPROXIMATION
   CRYSTALS
   MOMENT
   CAF2
Кл.слова (ненормированные):
spin dynamics -- singular points -- expansion over the reciprocal space dimension -- Expansion over the reciprocal space dimension -- Singular points -- Spin dynamics
Аннотация: We investigate generating functions for equipped trees composed of double bonds of two sorts on a hypercubic lattice of dimension d with built-in fragments. Rules for constructing these clusters are chosen to ensure the estimate for coefficients of power series in time for the longitudinal and transverse autocorrelation functions of the spin system with axially symmetric interaction. We derive a system of two equations for the tree-generating functions and an equation for the generating functions of chains leading from the root to a fragment in a tree using the Bethe approximation and under the condition that mainly bonds of one sort are taken into account. For the face-centered hypercubic lattice, we find the First terms of the 1/d expansion for the coordinate of the singular point of the generating function in both the anisotropic and the isotropic cases taking fragments in the forms of a triangle from four bonds and a four-fold bound pair into account. The obtained result is written in terms of ratios of lattice sums and is generalized to nuclear spin systems with dipole-dipole interaction. The theoretical value of the singular-point coordinate agrees well with the experimental value calculated from the tail of the absorption spectrum of the nuclear magnetic resonance in a barium fluoride monocrystal.

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Novosibirsk, Russia
Krasnoyarsk State Univ, Krasnoyarsk, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Branch, RAS, Russian Federation
Krasnoyarsk State University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Popov, M. A.; Зобов, Владимир Евгеньевич
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Zobov, V. E.
Singular points of time-dependent correlation functions of spin systems on large-dimensional lattices at high temperatures / V. E. Zobov // Theor. Math. Phys. - 2000. - Vol. 123, Is. 1. - P. 511-523, DOI 10.1007/BF02551058. - Cited References: 21 . - ISSN 0040-5779

РУБ Physics, Multidisciplinary + Physics, Mathematical
Рубрики:
BRANCHED POLYMERS
   HEISENBERG MAGNET
   EXPANSION
   MODELS
Аннотация: Time-dependent autocorrelation functions are investigated for the Heisenberg model with spins 1/2 on d-dimensional simple cubic lattices of large dimensions d at infinite temperature. The autocorrelation function on the imaginary time axis is interpreted as the generating function of bond trees constructed with double bonds. These trees provide the leading terms with respect to lid for the time-expansion coefficients of the autocorrelation function. The correction terms from branch intersections to the generating function in the Bethe approximation are derived for these trees. A procedure is suggested for finding the correction to the coordinate of the singular point of the generating function (i.e., to the reciprocal of the branch growth-rate parameter) from the above correction terms without calculating the number of trees. The leading correction terms of order 1/sigma(2) (where sigma = 2d - 1) are found for the coordinates of the singular points of the autocorrelation function in question and for the generating function of the trees constructed with single bonds in the Eden model.

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Держатели документа:
RAS, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk, Russia
ИФ СО РАН

Доп.точки доступа:
Зобов, Владимир Евгеньевич
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Zobov, V. E.
On the coordinate of a singular point of the time correlation function for a spin system on a simple hypercubic lattice at high temperatures / V. E. Zobov, M. A. Popov // Theor. Math. Phys. - 2002. - Vol. 131, Is. 3. - P. 862-872, DOI 10.1023/A:1015935809388. - Cited References: 19 . - ISSN 0040-5779

РУБ Physics, Multidisciplinary + Physics, Mathematical
Рубрики:
NUCLEAR-DOUBLE-RESONANCE
   HEISENBERG MAGNET
   DEPENDENCE
   MODEL
Кл.слова (ненормированные):
spin dynamics -- correlation functions -- power series in time -- frequency moments -- singular points -- generated functions -- lattice trees -- multidimensional expansion -- Correlation functions -- Frequency moments -- Generated functions -- Lattice trees -- Multidimensional expansion -- Power series in time -- Singular points -- Spin dynamics
Аннотация: Using the d(-1) expansion method (d is the space dimension), we estimate the coordinate of the time-dependent autocorrelation function singular point on the imaginary time axis for the spin 1/2 Heisenberg model on a simple hypercubic lattice at high temperatures. We represent the coefficients of the time expansion (the spectral moments) for the autocorrelation function as the sums of the weighted lattice figures in which the trees constructed from the double bonds give the leading contributions with respect to d(-1) and the same trees with the built-in squares from six bonds or diagrams with the fourfold bonds give the contribution of the next-to-leading order. We find the corrections to the coordinate of the autocorrelation function singular point that are due to the latter contributions.

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Держатели документа:
RAS, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, RAS, Krasnoyarsk, Russian Federation
Kirensky State University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Popov, M. A.; Зобов, Владимир Евгеньевич
}
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Zobov, V. E.
A Monte Carlo study of the dependence of the growth parameter for trees on the lattice dimension in the Eden model / V. E. Zobov, M. A. Popov // Theor. Math. Phys. - 2001. - Vol. 126, Is. 2. - P. 270-279, DOI 10.1023/A:1005260114182. - Cited References: 17 . - ISSN 0040-5779

РУБ Physics, Multidisciplinary + Physics, Mathematical
Рубрики:
DIFFUSION-LIMITED AGGREGATION
   BRANCHED POLYMERS
   HIGH-TEMPERATURES
   EXPANSION
   TIME
Аннотация: We use the Monte Carlo method to compute the number of trees with n edges in the Eden model on d-dimensional simple cubic lattices for d = 2, 3, 4, 6, 8, 10. We compare these numbers with the exact data derived by the enumeration method up to n = 12 on the square lattice and up to n = 10 on the cubic lattice. We find that for d greater than or equal to 3, the computed values of the growth parameter for trees agree with the values that we derived earlier by the expansion in inverse powers of 2d - 1.

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Держатели документа:
RAS, Siberian Branch, Kirenskii Phys Inst, Krasnoyarsk, Russia
Krasnoyarsk State Univ, Krasnoyarsk, Russia
ИФ СО РАН
Kirenskii Physics Institute, Siberian Branch, RAS, Krasnoyarsk, Russian Federation
Krasnoyarsk State University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Popov, M. A.; Зобов, Владимир Евгеньевич
}
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    Zn3GaB6O12As and Zn4P6N12S: Isotropic zero thermal expansion materials based on the "cage-restricting" model / Y. Liu, X. Jiang, M. S. Molokeev [et al.] // Chem. Mater. - 2022. - Vol. 34, Is. 22. - P. 9915-9922, DOI 10.1021/acs.chemmater.2c01947. - Cited References: 41. - This work was supported by the National Scientific Foundation of China (grant nos 12274425, 51872297, 11974360, and 51890864) and Fujian Institute of Innovation (FJCXY18010201) in CAS. X.X.J. acknowledges the support from Youth Talent Promotion Project from China Association for Science and Technology and the CAS Project for Young Scientists in Basic Research (grant YSBR-024) . - ISSN 0897-4756
   Перевод заглавия: Zn3GaB6O12As и Zn4P6N12S: изотропные материалы с нулевым тепловым расширением на основе модели «ограничения клетки»
Кл.слова (ненормированные):
Coefficient-of-thermal expansion -- Engineering fields -- Isotropics -- Material-based -- Molecular engineering -- Scientific fields -- Size invariants -- Temperature range -- Thermal expansion behavior -- Zero thermal expansion
Аннотация: With the capability to keep the size invariant along all dimensions over a certain temperature range, isotropic zero thermal expansion (ZTE) materials have been attracting wide interest in many scientific and engineering fields. Herein, based on the “cage-restricting” model for the ZTE materials with β-sodalite-like structures, we design and synthesize two new isotropic ZTE materials, Zn3GaB6O12As (ZGBA) and Zn4P6N12S (ZPNS), from the molecular engineering strategies of enhancing the cage-restricting force and of increasing the rigidity of β-sodalite cages, respectively. ZGBA and ZPNS exhibit isotropic ZTE behaviors in the temperature range from 20 to 300 K, with the coefficients of thermal expansion 1.18(17)/MK and 1.37(17)/MK, respectively, both of which are lowered by ∼30–20% in comparison with their template compound Zn4B6O12S (ZBS). The mechanisms of improved isotropic ZTE in ZGBA and ZPNS are unraveled by lattice dynamic analysis and temperature-dependent crystal structure evolution. This study paves new avenues to enhance the ZTE behavior in the materials with cage-like structures and has great implication on the exploration of isotropic ZTE materials.

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Держатели документа:
Functional Crystals Lab, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, China
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
Laboratory of Crystal Physics, Kirensky Institute of Physics Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Liu, Y.; Jiang, X.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zhang, X.; Lin, Z.
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X-Ray, Dielectric, and Thermophysical Studies of Rubidium Tetrachlorozincate inside Porous Glasses / L. N. Korotkov [et al.] // Bull. Russ. Acad. Sci. Phys. - 2019. - Vol. 83, Is. 9. - P. 1072-1076, DOI 10.3103/S1062873819090132. - Cited References: 17 . - ISSN 1062-8738
Кл.слова (ненормированные):
Borosilicate glass -- Chlorine compounds -- Ferroelectric materials -- Glass ceramics -- Rubidium -- Thermal expansion -- Zinc compounds
Аннотация: Results are presented from studying the X-ray diffraction, heat capacities, dielectric permittivities, and coefficients of the volumetric thermal expansion of composite materials obtained by embedding of Rb2ZnCl4 salt into the porous matrices of borosilicate glass with average pore diameters of 46 and 320 nm in the temperature range of 120–350 K. The temperatures of transitions to the incommensurate and ferroelectric phases are determined, along with the freezing temperature of the mobility of domain boundaries in Rb2ZnCl4 particles. A substantial increase in their Curie temperature is observed.

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Публикация на русском языке

Держатели документа:
Voronezh State Technical University, Voronezh, 394000, Russian Federation
Kirensky Institute of Physics, Krasnoyarsk, 660036, Russian Federation
Wroclaw University of Science and Technology, Wroclaw, 50-370, Poland
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Military Training and Scientific Center, Zhukovsky and Gagarin Air Force Academy, Voronezh, 394064, Russian Federation

Доп.точки доступа:
Korotkov, L. N.; Stekleneva, L. S.; Flerov, I. N.; Флёров, Игорь Николаевич; Mikhaleva, E. A.; Михалева, Екатерина Андреевна; Rysiakiewicz-Pasek, E.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Bondarev, I. A.; Бондарев, Илья Александрович; Gorev, M. V.; Горев, Михаил Васильевич; Sysoev, O. I.
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Val'kov, V. V.
Anomalies in the characteristics of electronic structure upon a quantum phase transition to a state with two order parameters and the breaking of time-reversal symmetry / V. V. Val’kov, A. O. Zlotnikov // Bull. Russ. Acad. Sci. Phys. - 2016. - Vol. 80, Is. 6. - P. 616-619, DOI 10.3103/S106287381606040X. - Cited References: 9 . - ISSN 1062-8738
Кл.слова (ненормированные):
Antiferromagnetism -- Electronic structure -- Phase transitions -- Temperature distribution -- Antiferromagnetic order parameter -- Density of state -- Landau expansion -- Periodic Anderson model -- Quantum phase transitions -- Temperature dependence -- Time reversal symmetries -- Two order parameters -- Quantum theory
Аннотация: Based on the periodic Anderson model, microscopic expressions for the Ginzburg–Landau expansion coefficients in a phase with superconducting and antiferromagnetic order parameters are obtained. Temperature dependences of the order parameters near the temperature of the transition to this phase are established. The emergence of anomalous properties upon the quantum phase transition to the phase with two order parameters is investigated. This transition is accompanied by drastic reconstruction of the density of states, reflected by the interplay between superconductivity and antiferromagnetism. © 2016, Allerton Press, Inc.

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Публикация на русском языке Вальков, Валерий Владимирович. Аномалии характеристик электронной структуры при квантовом фазовом переходе в состояние с двумя параметрами порядка и нарушенной симметрией относительно инверсии времени [Текст] / В. В. Вальков, А. О. Злотников // Изв. РАН. Сер. физ. - 2016. - Т. 80 № 6. - С. 683-686

Доп.точки доступа:
Zlotnikov, A. O.; Злотников, Антон Олегович; Вальков, Валерий Владимирович
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10.

    Two-dimensional negative thermal expansion in a crystal of LiBO2 / X. Zhang, X. Jiang, M. S. Molokeev [et al.] // Chem. Mater. - 2022. - Vol. 34, Is. 9. - P. 4195-4201, DOI 10.1021/acs.chemmater.2c00621. - Cited References: 55. - The authors acknowledge Zhuohong Yin and Jincheng Feng for useful discussions. This work was supported by the National Scientific Foundations of China [Grants 51702330, 11974360, 51872297, and 51890864] and the Young Elite Scientist Sponsorship (YESS) Program by the China Association for Science and Technology [Grant YESS20200149 for X.J.] . - ISSN 0897-4756
   Перевод заглавия: Двумерное отрицательное тепловое расширение в кристалле LiBO2
Кл.слова (ненормированные):
Crystal atomic structure -- Crystals -- Geometry -- Negative thermal expansion -- Thermal expansion
Аннотация: Negative thermal expansion (NTE), violating the common sense of “thermal expansion and cold contraction” effects, is a novel temperature-responding behavior of great scientific and technical significance. Herein, we report a two-dimensional (2D) NTE behavior in a crystal of LiBO2, which is constructed by graphite-like [LiBO2]∞ layers. This intriguing thermal property originates from the synergistic effect of the distortion of in-plane [LiO3] bases in [LiO4] tetrahedra and the rotation of [BO3] triangles in the [LiBO2]∞ layer, driven by the force perpendicular to the layer owing to the large interlayer separation as temperature increases. Remarkably, the in-plane and out-of-plane Li–O bonds within the [LiO4] tetrahedra have nearly the same bond strength and exhibit the similar variation with respect to temperature, and this is quite different from the common sense on the 2D NTE behavior in layered structures that the intralayer atomic interaction must be much stronger than the interlayer ones. Our study deepens the understanding of the 2D NTE mechanism and would promote the exploration for NTE materials.

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Держатели документа:
Functional Crystals Lab, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
University of the Chinese Academy of Sciences, Beijing, 100049, China
Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russian Federation
Department of Engineering Physics and Radioelectronic, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Zhang, X.; Jiang, X.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Wang, N.; Liu, Y.; Lin, Z.
}
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