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BAGAUTDINOV, B. S.
X-RAY-INVESTIGATIONS OF MODULATIONS IN CS2ZNI4 / B. S. BAGAUTDINOV, I. P. ALEKSANDROVA // Solid State Commun. - 1994. - Vol. 90, Is. 12. - P. 817-820, DOI 10.1016/0038-1098(94)90251-8. - Cited References: 8 . - ISSN 0038-1098

РУБ Physics, Condensed Matter
Рубрики:
INCOMMENSURATE PHASES
CRYSTALS
CS2CDI4
Аннотация: The X-ray diffractometer patterns of a reciprocal space have been analyzed in the modulated phases of Cs2ZnI4 crystals. The character of the atomic displacements in the modulation wave has been established. The temperature behaviour of both a modulation wave vector and amplitude has been determined from the position and intensity of satellite reflections.

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Держатели документа:
LV KIRENSKII INST PHYS,660036 KRASNOYARSK,RUSSIA
ИФ СО РАН

Доп.точки доступа:
ALEKSANDROVA, I. P.; Александрова, Инга Петровна
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Makarova, I. P.
X-ray diffraction study of RbLiCrO4 / I. P. Makarova, I. A. Verin, K. S. Aleksandrov // Ferroelectrics. - 1991. - Vol. 124, Is. 1. - P. 91-96, DOI 10.1080/00150199108209420. - Cited References: 12 . - ISSN 0015-0193

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
LITHIUM POTASSIUM-SULFATE
   THERMAL VIBRATIONS
   CRYSTALS
   PROGRAM
   KLISO4
   LIKSO4
Аннотация: Crystal structure of RbLiCrO4 was determined in G3 phase (sp. gr. P31c) at 293, 428, 493, 523 K and in G2 phase (sp. gr. P63) at 553, 583 K applying X-ray diffraction data. The investigated crystals exhibit ‘twinning by merohedry’. The analysis of intensities and influence of anomalous scattering on them allowed us to choose twin elements and atomic configurations of twin domains for all the investigated specimens.

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Доп.точки доступа:
Verin, I. A.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; European meeting on ferroelectricity(7 ; 1991 ; Jul ; 08-12 ; Dijon, France)
}
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Unidirectional amplification and shaping of optical pulses by three-wave mixing with negative phonons / A. K. Popov [et al.] // Appl. Phys. A. - 2013. - Vol. 115, Is. 2. - P. 523-529, DOI 10.1007/s00339-013-8078-4. - Cited References: 32. - This work was supported in parts by the US Air Force Office of Scientific Research under Grant No. FA950-12-1-298, by the US National Science Foundation under Grant No. ECCS-1028353, by the Presidium of the Russian Academy of Sciences under Grant No. 24-31 and by the Russian Federal Program on Science, Education and Innovation under Grant No. 14.A18.21.1942. . - ISSN 0947-8396. - ISSN 1432-0630

РУБ Materials Science, Multidisciplinary + Physics, Applied
Рубрики:
LEFT-HANDED METAMATERIALS
   2ND-HARMONIC GENERATION
   INDEX METAMATERIALS
   NONLINEAR OPTICS
   PARAMETRIC AMPLIFICATION
   COMPENSATING LOSSES
   BACKWARD WAVES
   OSCILLATOR
   CRYSTALS
Аннотация: A possibility to greatly enhance frequency-conversion efficiency of stimulated Raman scattering is shown by making use of extraordinary properties of three-wave mixing of ordinary and backward waves. Such processes are commonly attributed to negative-index plasmonic metamaterials. This work demonstrates the possibility to replace such metamaterials that are very challenging to engineer by readily available crystals which support elastic waves with contra-directed phase and group velocities. The main goal of this work was to investigate specific properties of indicated nonlinear optical process in short-pulse regime and to show that it enables elimination of fundamental detrimental effect of fast damping of optical phonons on the process concerned. Among the applications is the possibility of creation of a family of unique photonic devices such as unidirectional Raman amplifiers and femtosecond pulse shapers with greatly improved operational properties.

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Держатели документа:
Univ Wisconsin, Stevens Point, WI 54481 USA
Purdue Univ, Birck Nanotechnol Ctr, W Lafayette, IN 47907 USA
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Russian Acad Sci, Inst Phys, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Popov, A. K.; Попов, Александр Кузьмич; Shalaev, M. I.; Шалаев, Михаил Игоревич; Myslivets, S. A.; Мысливец, Сергей Александрович; Slabko, V. V.; Слабко, Виталий Васильевич; US Air Force Office of Scientific Research [FA950-12-1-298]; US National Science Foundation [ECCS-1028353]; Presidium of the Russian Academy of Sciences [24-31]; Russian Federal Program on Science, Education and Innovation [14.A18.21.1942]
}
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Thermodynamic Properties and Structure of Oxyfluorides Rb(2)KMoO(3)F(3) and K(2)NaMoO(3)F(3) / E. I. Pogorel'tsev [et al.] // Phys. Solid State. - 2011. - Vol. 53, Is. 6. - P. 1202-1211, DOI 10.1134/S1063783411060266. - Cited References: 24. - This study was supported by the Siberian Branch of the Russian Academy of Sciences within the framework of the Interdisciplinary Integration project no. 34 SO RAN and the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools of the Russian Federation (project no. NSh-4645-2010.2). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
T PHASE-DIAGRAM
   HEAT-CAPACITY
   TRANSITIONS
   (NH4)(3)MOO3F3
   (NH4)(3)TIOF5
   (NH4)(3)WO3F3
   RB2KTIOF5
   CRYSTALS
   CRYOLITE
   DISORDER
Аннотация: According to the results of calorimetric and structural studies, the Fm (3) over barm phase in K(2)NaMoO(3)F(3) remains stable at least to 100 K. No ferroelectric transformation assumed earlier has been revealed in a series of Rb(2)KMoO(3)F(3) samples prepared using various technologies. Only a phase transition of nonferroelectric origin has been observed near 195 K, and its thermodynamic characteristics have been determined. An analysis of the stability of the cubic structure of molybdenum fluorine-oxygen elpasolites-cryolites has been performed in the framework of the hypothesis on strengths of interatomic bonds. The barocaloric effect in Rb(2)KMoO(3)F(3) has been estimated.

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Держатели документа:
[Pogorel'tsev, E. I.
Gorev, M. V.
Flerov, I. N.] Siberian Fed Univ, Inst Engn Phys & Radioelect, Krasnoyarsk 660041, Russia
[Bogdanov, E. V.
Molokeev, M. S.
Voronov, V. N.
Gorev, M. V.
Flerov, I. N.] Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
[Isaenko, L. I.
Zhurkov, S. A.] Russian Acad Sci, Siberian Branch, Sobolev Inst Geol & Mineral, Novosibirsk 630090, Russia
[Laptash, N. M.] Russian Acad Sci, Far Eastern Branch, Inst Chem, Vladivostok 690022, Russia
ИФ СО РАН
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, pr. Svobodnyi 79, Krasnoyarsk 660041, Russian Federation
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk 630090, Russian Federation
Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences, ul. Stoletiya Vladivostoka 159, Vladivostok 690022, Russian Federation

Доп.точки доступа:
Pogorel'tsev, E. I.; Bogdanov, E. V.; Богданов, Евгений Витальевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Voronov, V. N.; Воронов, Владимир Николаевич; Isaenko, L. I.; Zhurkov, S. A.; Laptash, N. M.; Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич
}
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Flerov, I. N.
Thermodynamic properties and phase-transitions in halide perovskitelike ferroelastics / I. N. Flerov, M. V. Gorev // Izv. Akad. Nauk Ser. Fiz. - 1995. - Vol. 59, Is. 9. - P. 48-53. - Cited References: 28 . - ISSN 1026-3489

РУБ Physics, Multidisciplinary
Рубрики:
HYDROSTATIC-PRESSURE
   CRYSTALS
   RB3CD2CL7
   RBALF4
   CSSCF4

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Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Флёров, Игорь Николаевич
}
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Gorev, M. V.
Thermodynamic properties and p-T phase diagrams of (NH4)(3)M3+F6 cryolites (M3+: Ga, Sc) / M. V. Gorev, I. N. Flerov, A. . Tressaud // J. Phys.: Condens. Matter. - 1999. - Vol. 11, Is. 39. - P. 7493-7500, DOI 10.1088/0953-8984/11/39/306. - Cited References: 19 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
TRANSITIONS
CRYSTALS
Аннотация: Calorimetric and high pressure experiments are used to establish thermodynamic features of (NH4)(3)M3+F6 cryolites with M3+: Ga, Sc as they undergo one and three structural phase transitions, respectively. The heat capacity measurements performed between 80 K and 370 K, using an adiabatic calorimeter, have shown that all phase transitions under study are first order with different closeness to the tricritical point. The total entropy change in the Sc compound connected with the successive transformations is almost equal to the entropy change in the Ga cryolite. The effect of hydrostatic pressure has been studied up to 0.6 GPa, using differential thermographic analysis. The p-T phase diagrams of both cryolites were found to be rather complicated, including triple points. The experimental results are considered as connected with order-disorder phase transitions.

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Держатели документа:
LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Univ Bordeaux 1, CNRS, Inst Chim Mat Condensee, F-33608 Pessac, France
ИФ СО РАН
L V Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation
Inst. Chim. Matiere Cond. Bordeaux, CNRS, Universite Bordeaux I, 33608 Pessac Cedex, France

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Tressaud, A.; Горев, Михаил Васильевич
}
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Thermal properties of rare earth cobalt oxides and of La1–xGdxCoO3 solid solutions / Y. S. Orlov [et al.] // JETP Letters. - 2016. - Vol. 103, Is. 9. - P. 607-612, DOI 10.1134/S0021364016090058. - Cited References: 21. - This work was supported by the Russian Foundation for Basic Research, project nos. 16-02-00507 and 16-02-00098, and by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools, project no. SP-1844.2016.1. The X-ray diffraction analysis of the crystal structure and the measurement of specific heat were supported by the Siberian Branch, Russian Academy of Sciences (project no. V.45.3.1). . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
PROFILE REFINEMENT
SPIN
CRYSTALS
Аннотация: Powder X-ray diffraction data for the crystal structure, phase composition, and molar specific heat for La1‒xGdxCoO3 cobaltites in the temperature range of 300–1000 K have been analyzed. The behavior of the volume thermal expansion coefficient in cobaltites with isovalent doping in the temperature range of 100–1000 K is studied. It is found that the β(T) curve exhibits two peaks at some doping levels. The rate of the change in the occupation number for the high-spin state of cobalt ions is calculated for the compounds under study taking into account the spin–orbit interaction. With the Birch–Murnaghan equation of state, it is demonstrated that the low-temperature peak in the thermal expansion shifts with the growth of the pressure toward higher temperatures and at pressure P ∼ 7 GPa coincides with the second peak. The similarity in the behavior of the thermal expansion coefficient in the La1–xGdxCoO3 compounds with the isovalent substitution and the undoped LnCoO3 compound (Ln is a lanthanide) is considered. For the whole series of rare earth cobalt oxides, the nature of two specific features in the temperature dependence of the specific heat and thermal expansion is revealed and their relation to the occupation number for the high-spin state of cobalt ions and to the insulator–metal transition is established.

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Публикация на русском языке Термодинамические свойства редкоземельных оксидов кобальта и твердых растворов La1–xGdxCoO3 [Текст] / Ю. С. Орлов [и др.] // Письма в Журн. эксперим. и теор. физ. : Наука, 2016. - Т. 103 Вып. 9-10. - С. 689-694

Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, Russian Federation
Siberian Federal University, Svobodnyi pr. 79, Krasnoyarsk, Russian Federation
Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, Russian Federation
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Kashirskoe sh. 31, Moscow, Russian Federation

Доп.точки доступа:
Orlov, Yu. S.; Орлов, Юрий Сергеевич; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Gorev, M. V.; Горев, Михаил Васильевич; Vereshchagin, S. N.; Solov’ev, L. A.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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THE SEQUENCE OF STRUCTURAL PHASE-TRANSITIONS IN THE 3-LAYER PEROVSKIT-TYPE RB4CD3CL10 / A. F. BOVINA [и др.] // Fiz. Tverd. Tela. - 1990. - Vol. 32, Is. 9. - P. 2677-2683. - Cited References: 18 . - ISSN 0367-3294

РУБ Physics, Condensed Matter
Рубрики:
CRYSTALS
(CH3NH3)2CDCL4
RB2CDCL4

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Доп.точки доступа:
BOVINA, A. F.; KOKOV, I. T.; MELNIKOVA, S. V.; MISYUL, S. V.
}
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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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10.

    Temperature-dependent absorption lines observation in Raman spectra of SmFe3 (BO3)4 ferroborate / E. Moshkina [et al.] // J. Raman Spectrosc. - 2018. - Vol. 49, Is. 10. - P. 1732-1735, DOI 10.1002/jrs.5430. - Cited References: 12. - RFBR, Grant/Award Numbers: 18-02-00696 and 18-02-00754 . - ISSN 0377-0486. - ISSN 1097-4555
   Перевод заглавия: Температурно зависимые линии поглощения в спектрах комбинационного рассеяния ферробората SmFe3(BO3)4

РУБ Spectroscopy
Рубрики:
SmFe3 (BO3)4
Ho1-xNdxFe3(BO3)4
CRYSTALS
Кл.слова (ненормированные):
absorption -- ferroborates -- huntite -- level splitting -- magnetic phase -- transitions
Аннотация: The paper demonstrates possibilities of observation and thermal dependency study of the absorption lines as a co‐product of Raman spectroscopy study in SmFe3 (BO3)4 ferroborate. Raman spectra of the ferroborate were studied in a wide temperature range (T = 10÷300 K). Temperature‐dependent absorption lines sensitive to the magnetic phase transition have been observed in Raman spectra at two spectral ranges.

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Держатели документа:
RAS, Fed Res Ctr KSC SB, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian State Univ Sci & Technol, Krasnoyarsk, Russia.

Доп.точки доступа:
Moshkina, E. M.; Мошкина, Евгения Михайловна; Gudim, I. A.; Гудим, Ирина Анатольевна; Temerov, V. L.; Темеров, Владислав Леонидович; Krylov, A. S.; Крылов, Александр Сергеевич; RFBR [18-02-00696, 18-02-00754]
}
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11.

Malakhovskii, A. V.
Temperature dependence of the fine structure of the C and E absorption bands in RbMnF3 below the Neel temperature / A. V. Malakhovskii, T. P. Morozova // Phys. Solid State. - 2006. - Vol. 48, Is. 2. - P. 283-290, DOI 10.1134/S1063783406020156. - Cited References: 24 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
PEROVSKITE FLUORIDES
   VIBRONIC SPECTRA
   CRYSTALS
   MNF2
   INTENSITY
   DICHROISM
   STATES
Аннотация: The variation in the parameters (width, position, intensity) of the fine structure lines in the C[(6)A(1g) - (4)A(1g), E-4(g)((4)G)] and E[(6)A(1g) - E-4(g)(D-4)] bands in RbMnF3 with temperature is studied in the temperature range 10-70 K. In the C band, two narrow ( 6 cm(-1)) lines are are distinguished at distances of 77 and 80 cm(-1) from the exciton line at T

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Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Morozova, T. P.; Малаховский, Александр Валентинович
}
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12.

T-x phase diagram of solid solutions RbxK1-xLiSO4 / S. V. Melnikova [и др.] // Izv. Akad. Nauk Ser. Fiz. - 1998. - Vol. 62, Is. 8. - P. 1537-1540. - Cited References: 4 . - ISSN 1026-3489

РУБ Physics, Multidisciplinary
Рубрики:
TRANSITIONS
CRYSTALS

WOS

Доп.точки доступа:
Melnikova, S. V.; Grankina, V. A.; Bandarenko, G. V.; Gorev, M. V.; International Seminar on Physics of Ferroelastics(2 ; 1997 ; Jun 25-27 ; Kazan, Russia)
}
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13.

Synthesis and structural properties of cubic G0-Rb2KMoO3F3 oxyfluoride / V. V. Atuchin [et al.] // Ceram. Int. - 2012. - Vol. 38, Is. 3. - P. 2455-2459, DOI 10.1016/j.ceramint.2011.11.013. - Cited References: 23. - This study was partly supported by RFBR (Grant 09-02-00062) and SB RAS (Grant 34). . - ISSN 0272-8842

РУБ Materials Science, Ceramics
Рубрики:
PHASE-TRANSITIONS
   FERROELECTRIC K3WO3F3
   (NH4)(3)MOO3F3
   TEMPERATURE
   PEROVSKITE
   ELPASOLITE
   CRYSTALS
   BEHAVIOR
   High temperature
   Melt solidification
   Micromorphologies
   Melt solidification
   Microstructure-final
   Oxyfluorides
   Space Groups
   Oxyfluorides
   X ray methods
Кл.слова (ненормированные):
Powders: solid state reaction -- Microstructure-final -- X-ray methods -- Alkali oxides -- Halides
Аннотация: High-temperature G0 polymorph of Rb2KMoO3F3 has been prepared by melt solidification. Micromorphology and chemical properties of the final product were evaluated by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The elpasolite-related crystal structure of G0-Rb2KMoO3F3 has been refined by Rietveld method at T = 298 K (space group Fm-3m, a = 8.92446(8) Å, V = 710.76(1) Å3; RB = 3.55%). Ferroelectric G1-Rb2KMoO3F3 polymorph, earlier reported at T˂328 K, is not found at T = 298 K.

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Держатели документа:
[Atuchin, V. V.] SB RAS, Inst Semicond Phys, Lab Opt Mat & Struct, Novosibirsk 630090 90, Russia
[Gavrilova, T. A.] SB RAS, Inst Semicond Phys, Lab Nanolithog & Nanodiagnost, Novosibirsk 630090 90, Russia
[Isaenko, L. I.
Zhurkov, S. A.] SB RAS, Inst Geol & Mineral, Lab Crystal Growth, Novosibirsk 530090 90, Russia
[Kesler, V. G.] SB RAS, Inst Semicond Phys, Lab Phys Principles Integrated Microelect, Novosibirsk 630090 90, Russia
[Molokeev, M. S.] SB RAS, Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036 36, Russia

Доп.точки доступа:
Atuchin, V. V.; Gavrilova, T. A.; Isaenko, L. I.; Kesler, V. G.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zhurkov, S. A.
}
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14.

Studies of ferroelectric and magnetic phase transitions in multiferroic PbFe0.5Ta0.5O3-PbTiO3 solid solution ceramics / I. P. Raevski [et al.] // J. Mater. Sci. - 2014. - Vol. 49, Is. 18. - P. 6459-6466, DOI 10.1007/s10853-014-8376-z. - Cited References: 35. - This study is partially supported by the Russian Foundation for Basic Research (RFBR) Project 12-08-00887_a and Research Committee of the University of Macau under Research and Development Grant for Chair Professor. . - ISSN 0022-2461. - ISSN 1573-4803

РУБ Materials Science, Multidisciplinary
Рубрики:
MOSSBAUER
   CRYSTALS
   BEHAVIOR
   NIOBATE
Аннотация: Dielectric, X-ray, Mossbauer and magnetization studies of (1 − x)PbFe0.5Ta0.5O3–(x)PbTiO3 ceramics with 0 ≤ x ≤ 0.3 have been carried out to determine the compositional evolution of ferroelectric and magnetic phase transition temperatures. Addition of PbTiO3 to PbFe0.5Ta0.5O3 increases the temperature T m of the dielectric permittivity maximum, decreases both the diffusion of this maximum and its frequency dependence. However, the Curie–Weiss temperature exceeds T m for all the compositions studied, indicating that the phase transition still remains diffused. Dilution of the (Fe, Ta)-sublattice by Ti lowers the Neel temperature T N but above a certain compositional threshold (x ≈ 0.1) fast lowering of T N stops and a new magnetic state stable in a rather wide compositional range appears. Large difference between the zero-field-cooled (ZFC) and FC magnetization–temperature curves as well as between the temperatures of magnetic phase transition determined from Mossbauer and magnetization studies for compositions with x 0.1 implies that this state is a spin-glass phase.

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Держатели документа:
Southern Fed Univ, Fac Phys, Rostov Na Donu 344090, Russia
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
Univ Macau, Fac Sci & Technol, Taipa, Peoples R China
Natl Taiwan Univ Sci & Technol, Taipei 106, Taiwan

Доп.точки доступа:
Raevski, I. P.; Titov, V. V.; Malitskaya, M. A.; Eremin, E. V.; Еремин, Евгений Владимирович; Kubrin, S. P.; Blazhevich, A. V.; Chen, H.; Chou, C.-C.; Raevskaya, S. I.; Zakharchenko, I. N.; Sarychev, D. A.; Shevtsova, S. I.; Russian Foundation for Basic Research (RFBR) [12-08-00887_a]; Research Committee of the University of Macau
}
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15.

Structures of distorted phases and critical and noncritical atomic displacements of elpasolite Rb2KInF6 during phase transitions / K. S. Aleksandrov [et al.] // Phys. Solid State. - 2009. - Vol. 51, Is. 12. - P. 2505-2512, DOI 10.1134/S1063783409120130. - Cited References: 21. - This work was supported by the Council on Grants from the President of the Russian Federation, grant NSh-1011.2008.2. . - ISSN 1063-7834
Рубрики:
CRYSTALS
Аннотация: The structures of all three phases of the Rb2KInF6 crystal have been determined from the experimental X-ray diffraction data for the powder sample. The refinement of the profile and structural parameters has been carried out by the technique implemented in the DDM program, which minimizes the differences between the derivatives of the calculated and measured X-ray intensities over the entire profile of the X-ray diffraction pattern. The results obtained have been discussed using the group-theoretical analysis of the complete order-parameter condensate, which takes into account the critical and noncritical atomic displacements and permits the interpretation of the experimental data obtained previously. It has been reliably established that the sequence of changes in the symmetry during phase transitions in Rb2KInF6 can be represented as Fm (3) over barm 11-9(Gamma(+)(4))- 0, 0, phi I114/m 11-9(Gamma(+)(4)) circle plus 10-3(Chi(+)(3))- (psi, phi, phi) P12(1)/n1.

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Публикация на русском языке Структуры искаженных фаз, критические и некритические смещения атомов эльпасолита Rb[2]KInF[6] при фазовых переходах [Текст] / К. С. Александров [и др.] // Физ. тверд. тела. - 2009. - Т. 51 Вып. 12. - С. 2359-2364

Держатели документа:
[Aleksandrov, K. S.
Molokeev, M. S.
Voronov, V. N.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Aleksandrov, K. S.
Misyul, S. V.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН

Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Misyul, S. V.; Мисюль, Сергей Валентинович; Molokeev, M. S.; Молокеев, Максим Сергеевич; Voronov, V. N.; Воронов, Владимир Николаевич; President of the Russian Federation [NSh-1011.2008.2]
}
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16.

Structural transformations and phenomenological description of the formation of phase states in elpasolites Cs2RbDyF6 and Rb2KB′F6 (B′ = Ho, Dy, Tb) / I. N. Safonov [et al.] // Phys. Solid State. - 2015. - Vol. 57, Is. 3. - P. 491-498, DOI 10.1134/S1063783415030282. - Cited References:20. - This study was supported by the Ministry of Education and Science of the Russian Federation within the framework of the State Task for the Russian Siberian Federal University for Implementation of Scientific Research Work in 2014 (assignment no. 3.2534.2014/K). . - ISSN 1063. - ISSN 1090-6460. -

РУБ Physics, Condensed Matter
Рубрики:
TRANSITIONS
CRYSTALS
Аннотация: The structures of the cubic and monoclinic phases of an Rb2KHoF6 crystal from a series of elpasolites Rb2KB′F6 (B′ = Ho, Dy, Tb), which undergoes a trigger phase transition, have been investigated using X-ray powder diffraction. The critical and noncritical displacements of atoms in the Rb2KHoF6 structure have been determined from the group-theoretical analysis of the complete condensate of order parameters. It has been reliably established that a change in the symmetry due to the phase transition in this crystal can be represented in the form Fmˉ3m11−9(Γ+4)⊕10−3(X+3)(ϕ,ϕ,ψ)P121/n1Fm\bar 3m\frac{{11 - 9(\Gamma _4. + ) \oplus 10 - 3(X_3. + )}} {{(\phi ,\phi ,\psi )}}P12_1 /n1 . A phenomenological analysis of the conditions responsible for the formation of phase states upon the phase transitions in elpasolites Cs2RbDyF6 and Rb2KB′F6 (B′ = Ho, Dy, Tb) has been carried out. Taking into account the structural data and using the phenomenological theory, it has been found that the main factor determining the formation of phase states in these and related crystals is the instability of the elpasolite structure with respect to rotational distortions of two types. It has been shown that an important role in the formation of a sequence of structural transformations in these crystals is played by the interaction of rotational order parameters and displacements of the cation from the center of a cuboctahedral hole.

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Публикация на русском языке Структурные превращения и феноменологическое описание формирования фазовых состояний в эльпасолитах Cs2RbDyF6 и Rb2KB'F6 (B'=Ho, Dy, Tb) [Текст] / И. Н. Сафонов [и др.] // Физ. тверд. тела : Физико-технический институт им. А. Ф. Иоффе РАН, 2015. - Т. 57 Вып. 3. - С. 480-486

Держатели документа:
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia.
Southern Fed Univ, Inst Phys Res, Rostov Na Donu 344090, Russia.

Доп.точки доступа:
Safonov, I. N.; Misyul', S. V.; Мисюль, Сергей Валентинович; Molokeev, M. S.; Молокеев, Максим Сергеевич; Ivliev, M. P.; Ministry of Education and Science of the Russian Federation [3.2534.2014/K]
}
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17.

Zinenko, V. I.
Statistical mechanics of cation ordering in PbSc1/2Ta1/2O3 and PbSc1/2Nb1/2O3 solid solutions / V. I. Zinenko, S. N. Sofronova // Phys. Solid State. - 2005. - Vol. 47, Is. 12. - P. 2309-2314, DOI 10.1134/1.2142896. - Cited References: 17 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
PHASE-TRANSITION
   PEROVSKITE
   DISORDER
   FERROELECTRICS
   CRYSTALS
   MODEL
Аннотация: A model Hamiltonian for B cation ordering (Sc-Nb(Ta)) in PbSc1/2Nb1/2O3 and PbSc1/2Ta1/2O3 solid solutions is constructed. The parameters of the model Hamiltonian are determined from the ab initio calculation within the ionic crystal model with allowance made for the deformability and the dipole and quadrupole polarizabilities of the ions. The temperatures of the phase transition due to the ordering of the B cations are calculated by the Monte Carlo method in the mean-field and cluster approximations. The phase transition temperatures calculated by the Monte Carlo method (1920 K for PbSc1/2Ta1/2O3 and 1810 K for PbSc1/2Nb1/2O3) are consistent with the experimental data (1770 and 1450 K, respectively). The thermodynamic properties of the cation ordering are investigated using the Monte Carlo method. (c) 2005 Pleiades Publishing, Inc.

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Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Sofronova, S. N.; Софронова, Светлана Николаевна; Зиненко, Виктор Иванович
}
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18.

Klimin, S. A.
Spin-phonon and electron-phonon interactions in multiferroic GdFe3(BO3)4 and TbFe3(BO3)4 evidenced by IR reflection spectroscopy / S. A. Klimin, M. A. Kashchenko, L. N. Bezmaternykh // J. Low Temp. Phys. - 2016. - Vol. 185, Is. 5-6. - P. 538-543, DOI 10.1007/s10909-016-1597-6. - Cited References:19. - The authors thank Alexey Kuzmenko and Marina Popova for fruitful discussions. This paper was supported by the Russian Science Foundation under Grant No. 14-12-01033, by the Swiss National Science Foundation (SNSF), and by the Science and Technology cooperation program "Switzerland-Russia" of the University of Geneva. . - ISSN 0022-2291. - ISSN 1573-7357

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
PHASE-TRANSITIONS
   GdFe3(BO3)4
   CRYSTALS
   SPECTRUM
Кл.слова (ненормированные):
Multiferroics -- IR-active phonons -- Spin-phonon interaction -- Coupled -- electron-phonon mode
Аннотация: We study temperature-dependent polarized reflection spectra of multiferroic GdFe3(BO3)4 and TbFe3(BO3)4 single crystals. Signatures of spin–lattice interactions in both compounds and of a formation of the electron–phonon coupled mode in TbFe3(BO3)4 are discussed.

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Держатели документа:
Inst Spect RAS, Moscow 108840, Russia.
Moscow Inst Phys & Technol, Dolgoprudnyi 141700, Moscow Region, Russia.
RAS, Siberian Branch, Kirenskiy Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Kashchenko, M. A.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Russian Science Foundation [14-12-01033]; Swiss National Science Foundation (SNSF); Science and Technology cooperation program "Switzerland-Russia" of the University of Geneva
}
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19.

Chukalina, E. P.
Spectroscopic study of magnetic phase transitions in NdxGd1-xFe3(BO3)(4) / E. P. Chukalina, L. N. Bezmaternykh // Phys. Solid State. - 2005. - Vol. 47: 12th Feofilov Workshop on Spectroscopy of Crystal Activated by Rare-Earth and Transition-Metal Ions (SEP 22-25, 2004, Yekaterinburg, RUSSIA), Is. 8. - P. 1528-1531, DOI 10.1134/1.2014507. - Cited References: 10 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
CRYSTALS
ND
Аннотация: Magnetic ordering and spin reorientation in iron borates NdxGd1 - xFe3(BO3)(4) (x = 0.01, 0.04, 0.25, 1.0) are studied using a rare-earth spectroscopic probe. (c) 2005 Pleiades Publishing, Inc.

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Держатели документа:
Russian Acad Sci, Inst Spect, Troitsk 142190, Moscow Oblast, Russia
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow oblast, 142190, Russian Federation
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Bezmaternykh, L. N.; Безматерных, Леонард Николаевич
}
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20.

Spectral signatures of spin-phonon and electron-phonon interactions in multiferroic iron borates / M. N. Popova [et al.] // J. Magn. Magn. Mater. - 2015. - Vol. 383. - P. 250-254, DOI 10.1016/j.jmmm.2014.10.095. - Cited References:32. - This work was supported by the Russian Science Foundation (Grant no. 14-12-01033). Experiments at U4-IR beamline NSLS-BNL (T.N.S. and A.A.S.) were performed under Contract no. DE-FG02-07ER46382 from the U.S. Department of Energy. The National Synchrotron Light Source is operated as a User Facility for the U.S. Department of Energy under Contract no. DE-AC02-98CH10886. M.N.P. thanks B.Z. Malkin for helpful discussions. . - ISSN 0304-8853. - ISSN 1873-4766

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
SMFE3(BO3)4
   SPECTROSCOPY
   CRYSTALS
   SM
Кл.слова (ненормированные):
Rare-earth iron borates -- Spin phonon interactions -- Electron phonon coupling -- Optical spectroscopy
Аннотация: High-resolution far-infrared reflection and polarized ellipsometry, as well as Raman scattering temperature-dependent measurements are used to study spin-phonon and electron-phonon interactions in rare-earth (RE) iron borates with the R32 structure of a natural mineral huntite, namely, in RFe3(BO3)4 with R=Pr, Nd, and Sm. Pronounced peculiarities in the ω(T) dependences at the Néel temperature TN≈32 K are observed for all the compounds studied and the origin of these peculiarities is discussed. A coupling between lattice phonons and crystal-field excitations of a RE ion manifests itself by a renormalization of frequencies and intensities of coupled modes. Modeling of the spectra has revealed the value of about 15 cm−1 for the electron–phonon coupling constant in PrFe3(BO3)4.
Высокоразрешающая эллипсометрия дальнего инфракрасного отражения и поляризованный света, а также температурнозависимые измерения комбинационного рассеяния используются для изучения спин-фононных и электрон-фононных взаимодействий в редкоземельных (RE) боратах железа со структурой R32 природного минерала хантита , а именно, в RFe3 (BO3) 4 с R = Pr, Nd, и Sm. Выраженные особенности ω (T) зависимостей при температуре Нееля TN ≈32 K наблюдаются для всех исследованных соединений и происхождение этих особенностей обсуждается.Связь между фононами решетки и возбуждениями кристаллического поля РЗ иона проявляется себя перенормализации частоты и интенсивности связанных мод. Моделирование спектров показал значение около 15cm-1 для константы электрон-фононной связи в PrFe3 (BO3) 4.

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Доп.точки доступа:
Popova, M. N.; Boldyrev, K. N.; Klimin, S. A.; Stanislavchuk, T. N.; Sirenko, A. A.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Russian Science Foundation [14-12-01033]; U.S. Department of Energy [DE-FG02-07ER46382, DE-AC02-98CH10886]; Moscow International Symposium on Magnetism(6 ; 2014 ; June-July ; Moscow)
}
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