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1.


   
    Cerenkov nonlinear diffraction of femtosecond pulses / A. M. Vyunishev [et al.] // J. Opt. Soc. Am. B. - 2013. - Vol. 30, Is. 7. - P. 2014-2021, DOI 10.1364/JOSAB.30.002014. - Cited References: 43. - The work was partially supported by the Grant of the President of the Russian Federation MK-250.2013.2, by RFBR through Grant No. 12-02-31167, by the Ministry of Education and Science of the Russian Federation (Contract No. 14.B37.21.0730), by Krasnoyarsk Regional Fund of Science and Technical Activity Support, by PSB RAS Project 2.5.2, and by SFU Grant F12. . - ISSN 0740-3224
   Перевод заглавия: Черенковская нелинейная дифракция фемтосекундных импульсов
РУБ Optics
Рубрики:
STRONTIUM BARIUM NIOBATE
   2ND-HARMONIC GENERATION

   PHOTONIC CRYSTAL

   DOMAIN-WALLS

   MODULATION

Аннотация: Cerenkov nonlinear diffraction of femtosecond pulses in one-dimensional nonlinear photonic crystal of strontium tetraborate was studied theoretically and experimentally in both frequency and time domains. Spectral features of second harmonic radiation were measured in the course of mapping the nonlinear photonic crystal structure. The local second harmonic spectrum demonstrates complex angular behavior within the beam cross section. The spectral width of the second harmonic radiation is found to be fundamental beam size-dependent, and optimal focusing should be used for exact conversion of the fundamental spectrum into the second harmonic one. Experimental results are in excellent agreement with calculations. Maximum second harmonic generation efficiency was up to 2.1% at pumping by a femtosecond oscillator. (C) 2013 Optical Society of America

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660079, Russia

Доп.точки доступа:
Vyunishev, A. M.; Вьюнышев, Андрей Михайлович; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Zaitsev, A. I.; Зайцев, Александр Иванович; Slabko, V. V.; Слабко, Виталий Васильевич
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2.


   
    Čerenkov nonlinear diffraction in random nonlinear photonic crystal of strontium tetraborate / A. M. Vyunishev [et al.] // Appl. Phys. Lett. - 2012. - Vol. 101, Is. 21. - Ст. 211114, DOI 10.1063/1.4767385. - Cited References: 29. - The work was supported by RFBR through the Grant No. 12-02-31167, by the Ministry of Education and Science of Russian Federation (Contract No. 14.B37.21.0730 and Grant No. 2.1.1/3455), by RAS Projects 24.29 and 24.31, by PSB RAS Projects 2.5.2 and 3.9.5, by SB RAS Projects 43 and 101, and by SFU Grant F12. . - ISSN 0003-6951
Рубрики:
POLED LITHIUM-NIOBATE
   2ND-HARMONIC GENERATION

   BARIUM NIOBATE

   PULSES

Аннотация: Čerenkov-type second harmonic generation of femtosecond pulses in random one-dimensional nonlinear photonic crystal of strontium tetraborate is investigated experimentally and theoretically. Sidebands in angular-spectral dependence of generated second harmonic were detected and found to be in perfect agreement with calculations. Spectral maximum of generated radiation experiences deviation from Čerenkov relation due to influence of nonlinear photonic crystal structure. Pulse duration and local spectrum of Čerenkov second harmonic are measured and found to be in fair agreement with each other.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660079, Russia

Доп.точки доступа:
Vyunishev, A. M.; Вьюнышев, Андрей Михайлович; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Zaitsev, A. I.; Зайцев, Александр Иванович; Slabko, V. V.; Слабко, Виталий Васильевич
}
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3.


   
    Nonlinear Raman-Nath diffraction of femtosecond laser pulses / A. M. Vyunishev [et al.] // Opt. Lett. - 2014. - Vol. 39, Is. 14. - P. 4231-4234, DOI 10.1364/OL.39.004231. - Cited References: 22. - This work was partially supported by the Grant of the President of the Russian Federation MK-250.2013.2, Krasnoyarsk Regional Fund for Science and Technical Activity Support and by the RAS grant no. 24.31. A. A. acknowledges the financial support of young scientists through the Ural Federal University Development Program. The authors thank A. S. Chirkin and I. V. Timofeev for fruitful discussions and A. V. Barannik for optical microscopy of the samples. . - ISSN 0146-9592. - ISSN 1539-4794
   Перевод заглавия: Нелинейная дифракция Рамана-Ната фемтосекундных лазерных импульсов
РУБ Optics
Рубрики:
STRONTIUM BARIUM NIOBATE
   2nd-HARMONIC GENERATION

   PHOTONIC STRUCTURES

   DOMAIN-STRUCTURE

   LITHIUM-NIOBATE

   CRYSTAL

Аннотация: We study the nonlinear Raman–Nath diffraction (NRND) of femtosecond laser pulses in a 1D periodic nonlinear photonic structure. The calculated second-harmonic spectra represent frequency combs for different orders of transverse phase matching. These frequency combs are in close analogy with the well-known spectral Maker fringes observed in single crystals. The spectral intensity of the second harmonic experiences a redshift with a propagation angle, which is opposite the case of Čerenkov nonlinear diffraction. We analyze how NRND is affected by the group-velocity mismatch between fundamental and second-harmonic pulses and by the parameters of the structure. Our experimental results prove the theoretical predictions.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660079, Russia
Ural Fed Univ, Ekaterinburg 620000, Russia
Labfer Ltd, Ekaterinburg 620014, Russia

Доп.точки доступа:
Vyunishev, A. M.; Вьюнышев, Андрей Михайлович; Slabko, V. V.; Слабко, Виталий Васильевич; Baturin, I. S.; Akhmatkhanov, A. R.; Shur, V. Y.; Russian Federation [MK-250.2013.2]; Krasnoyarsk Regional Fund for Science and Technical Activity Support; RAS grant [24.31]; Ural Federal University Development Program
}
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4.


   
    Mode splitting in 37-42 GHz barium hexaferrite resonator: Theory and device applications / M. A. Popov [et al.] // IEEE Trans. Magn. - 2014. - Vol. 50, Is. 6. - Ст. 4004507, DOI 10.1109/TMAG.2014.2298498. - Cited References: 34 . - ISSN 0018-9464. - ISSN 1941-0069
РУБ Engineering, Electrical & Electronic + Physics, Applied
Рубрики:
MILLIMETER-WAVE APPLICATIONS
   GUIDE JUNCTION CIRCULATORS

   FERRITE

   MICROWAVE

   PROPAGATION

   CYLINDERS

Кл.слова (ненормированные):
Dielectric resonance -- ferromagnetic resonance (FMR) -- hexagonal ferrite -- isolator -- phase shifter
Аннотация: Dielectric resonances in the 37-42 GHz frequency band in the single crystal barium hexaferrite that occur well below the ferromagnetic resonance (FMR) have been investigated. Sample dimensions have been chosen so that the mode frequency is lower than the spin-wave excitation (in this case, the natural domain resonance) frequency. Such dielectric mode frequencies, being a function of both permittivity and permeability, are magnetic field H tunable. Here, we report on below-FMR magnetodielectric resonance (MDR) axially magnetized barium hexaferrites and their H-tuning characteristics. Our studies reveal H-tuning by up to 2.5 GHz and the tuning is the largest when the ferrite is in a magnetically unsaturated state. A theory for the MDR is presented and a fairly good agreement between experimental data and theory has been obtained. Tunable millimeter wave phase shifters and isolators utilizing the below-FMR dielectric resonances have been demonstrated.

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Держатели документа:
Taras Shevchenko Natl Univ Kyiv, Radiophys Dept, UA-01601 Kiev, Ukraine
Oakland Univ, Dept Phys, Rochester, MI 48309 USA
Russian Acad Sci, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Popov, M. A.; Zavislyak, I. V.; Movchan, N. N.; Gudim, I. A.; Гудим, Ирина Анатольевна; Srinivasan, G.
}
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5.


   
    Superconductivity near liquid nitrogen temperature in the Sn-Ba-Sr-Y-Cu-O system / K. S. Aleksandrov [et al.] // Physica C-Superconductivity and its Applications. - 1989. - Vol. 161, Is. 4. - P. 493-496, DOI 10.1016/0921-4534(89)90087-7 . - ISSN 0921-4534
Кл.слова (ненормированные):
Ceramic Materials -- Tin Compounds -- Bulk Superconductivity -- High Temperature Superconductors -- Oxide Superconductors -- Tin Barium Strontium Yttrium Copper Oxide -- Superconducting Materials
Аннотация: A high-Tc phase was found in the Sn-Ba-Sr-Y-Cu-O system. DC susceptibility data of Sn2Ba2Sr0.5Y0.5Cu3Ox show a single transition to bulk superconductivity with an onset temperature of 86 K. В© 1989.

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Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Khrustalev, B. P.; Хрусталев, Борис Петрович; Krivomazov, S. N.; Петров, Михаил Иванович; Petrov, M. I.; Vasilyev, A. D.; Zwegintsev, S. A.
}
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6.


   
    Peculiarities of the resistive state of the (Y,Lu)1Ba2Cu3O7-δ superconducting ceramics / K. S. Aleksandrov [et al.] // Physica C. - 1988. - Vol. 156, Is. 2. - P. 249-250 . - ISSN 0921-4534
Кл.слова (ненормированные):
Ceramic Materials -- Oxides -- Current Voltage Characteristics -- Yttrium Barium Copper Oxides -- Superconducting Materials
Аннотация: The resistive state of the high-Tc superconducting ceramics (Y, Lu)1Ba2Cu3O7-δ has been investigated, a hysteresis instability has been discovered in the current-voltage characteristics (CVC) under a current density j ≈ 1.7 kA cm-2. © 1988.

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Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Vasilyev, A. D.; Васильев, Александр Дмитриевич; Zwegintsev, S. A.; Звегинцев, Сергей Анатольевич; Петров, Михаил Иванович; Petrov, M. I.; Khrustalev, B. P.; Хрусталев, Борис Петрович
}
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7.


   
    Thermal expansion and permittivity of (Ba1-xBi2x/3)TiO3 solid solutions / M. V. Gorev [et al.] // Phys. Solid State. - 2011. - Vol. 53, Is. 10. - P. 2073-2079, DOI 10.1134/S1063783411100143. - Cited References: 24. - This study was supported by the Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools (grant NSh-4645.2010.2). . - ISSN 1063-7834
РУБ Physics, Condensed Matter
Рубрики:
BARIUM-TITANATE
   CERAMICS

   BATIO3

   BEHAVIOR

   PHASE

   FERROELECTRICS

Аннотация: The strain, the thermal expansion coefficient, and the permittivity of ceramic samples of (Ba1 - x Bi-2x/3)TiO3 solid solutions with x = 0, 0.01, 0.03, and 0.05 have been studied in the temperature range 120-700 K. Based on an analysis of the results, the temperature-composition phase diagram has been refined, and the temperature dependence of the polarization has been calculated.

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Держатели документа:
[Gorev, M. V.
Flerov, I. N.
Bondarev, V. S.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Gorev, M. V.
Bondarev, V. S.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Maglione, M.
Simon, A.] Univ Bordeaux 1, ICMCB CNRS, Pessac, France
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Science, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, pr. Svobodnyi 79, Krasnoyarsk 660041, Russian Federation
ICMCB-CNRS, Universite de Bordeaux 1, Pessac, France

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Maglione, M.; Simon, A.
}
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8.


   
    Contributions from Inter-grain Boundaries to the Magneto-resistive Effect in Polycrystalline High-T (C) Superconductors. The Underlying Reason of Different Behavior for YBCO and BSCCO Systems / D. A. Balaev [et al.] // J. Supercond. Nov. Magn. - 2011. - Vol. 24, Is. 7. - P. 2129-2136, DOI 10.1007/s10948-011-1166-9. - Cited References: 30. - This work is supported by program N5 of RAS, project N7. . - ISSN 1557-1939
РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTORS
   PHASE-SLIP

   TRANSPORT-PROPERTIES

   TRANSITION

   FIELD

   COMPOSITES

   BULK

   TAPES

   YBA2CU3O7-DELTA

   DISSIPATION

Кл.слова (ненормированные):
BSCCO -- YBCO -- Intergrain boundaries -- Magnetoresistance -- BSCCO -- Intergrain boundaries -- Magnetoresistance -- YBCO -- BSCCO -- BSCCO system -- Comparative studies -- High Tc superconductors -- High-field -- Inter-grain -- Irreversibility lines -- Magneto-resistive effect -- Polycrystalline -- Resistive transition -- Standard measurements -- Weak pinning -- YBCO -- Bismuth -- Electric resistance -- Grain boundaries -- High temperature superconductors -- Lead -- Magnetic fields -- Magnetoelectronics -- Magnetoresistance -- Magnetos -- Superconductivity -- Yttrium barium copper oxides -- Semiconductor metal boundaries
Аннотация: In order to clarify the mechanisms in charge of broadening of resistive transition R(T) in magnetic fields of bismuth-based polycrystalline high-T (C) superconductor (HTSC), a comparative study of Bi1.8Pb0.3Sr1.9Ca2Cu3O (x) (BSCCO) and YBa2Cu3O7-delta (YBCO) have been performed. Magnetoresistive effects and irreversibility line obtained from magnetic measurements have been studied. It was established that (1) for YBCO, the smooth part of R(T) dependence unambiguously corresponds to dissipation in the intergrain boundaries for arbitrary magnetic fields; (2) for polycrystalline BSCCO, the smooth part of R(T) dependences correspond to dissipation within intergrain boundary subsystem in the field range H <10(2) Oe only, while standard measurements of R(T) dependences in magnetic field range H > 10(2) Oe reflect the dissipation processes occurring both in intergrain boundary and HTSC grain subsystems; (3) for the high-field range, the contribution from intergrain boundaries of BSCCO can be distinguished from magnetoresistance R(H) dependences obtained at high enough current density on textured samples. It is proposed that various magneto-resistive properties of these classical HTSC systems are due comparatively weak pinning in BSCCO.

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Держатели документа:
[Balaev, D. A.
Popkov, S. I.
Semenov, S. V.
Bykov, A. A.
Dubrovskiy, A. A.
Shaikhutdinov, K. A.
Petrov, M. I.] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Balaev, D. A.
Popkov, S. I.
Sabitova, E. I.
Dubrovskiy, A. A.
Shaikhutdinov, K. A.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
L.V. Kirensky Institute of Physics, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Popkov, S. I.; Попков, Сергей Иванович; Semenov, S. V.; Семенов, Сергей Васильевич; Bykov, A. A.; Быков, Алексей Анатольевич; Sabitova, E. I.; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Petrov, M. I.; Петров, Михаил Иванович
}
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9.


   
    Electronic Structure of p-Type La1-xMx2+MnO3 Manganites in the Ferromagnetic and Paramagnetic Phases in the LDA plus GTB Approach / V. A. Gavrichkov [et al.] // J. Exp. Theor. Phys. - 2011. - Vol. 112, Is. 5. - P. 860-876, DOI 10.1134/S1063776111030101. - Cited References: 47. - This study was supported financially by integration project no. 40 of the Ural and Siberian Branches of the Russian Academy of Sciences, the program "Strong Electron Correlations" of the Russian Academy of Sciences, and the Russian Foundation for Basic Research (project no. 10-02-00251-a). . - ISSN 1063-7761
РУБ Physics, Multidisciplinary
Рубрики:
DOUBLE-EXCHANGE
   COLOSSAL MAGNETORESISTANCE

   THIN-FILMS

   PHYSICS

   LA1-XSRXMNO3

   RESISTIVITY

   SEPARATION

   TRANSPORT

   MODEL

Кл.слова (ненормированные):
Complex structure -- Cubic materials -- Ferromagnetic phase -- Half metals -- Jahn Teller effect -- Metal properties -- Metal types -- Orbitals -- P-type -- Paramagnetic phase -- Paramagnetic phasis -- Quasi particles -- Spectral intensity -- Spin projections -- Strong electron correlations -- Barium -- Density functional theory -- Electron correlations -- Electron density measurement -- Electronic properties -- Electronic structure -- Fermi level -- Ferromagnetic materials -- Ferromagnetism -- Manganese oxide -- Manganites -- Paramagnetic materials -- Paramagnetism -- Valence bands -- Lanthanum
Аннотация: The band structure, spectral intensity, and position of the Fermi level in doped p-type La1-xMx2+ MnO3 manganites (M = Sr, Ca, Ba) is analyzed using the LDA + GBT method for calculating the electronic structure of systems with strong electron correlations, taking into account antiferro-orbital ordering and using the Kugel-Khomskii ideas and real spin S = 2. The results of the ferromagnetic phase reproduce the state of a spin half-metal with 100% spin polarization at T = 0, when the spectrum is of the metal type for a quasiparticle with one spin projection and of the dielectric type for the other. It is found that the valence band becomes approximately three times narrower upon a transition to the paramagnetic phase. For the paramagnetic phase, metal properties are observed because the Fermi level is located in the valence band for any nonzero x. The dielectrization effect at the Curie temperature is possible and must be accompanied by filling of d(x) orbitals upon doping. The effect itself is associated with strong electron correlations, and a complex structure of the top of the valence band is due to the Jahn-Teller effect in cubic materials. DOI: 10.1134/S1063776111030101

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Публикация на русском языке Электронная структура манганитов La[1-x]M[x]2+MnO[3] p-типа в ферромагнитной и парамагнитной фазах в рамках LDA+GTB-подхода [Текст] / В. А. Гавричков [и др.] // Журнал экспериментальной и теоретической физики. - 2011. - Т. 139 Вып. 5. - С. 983-1000

Держатели документа:
[Gavrichkov, V. A.
Ovchinnikov, S. G.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Gavrichkov, V. A.
Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Nekrasov, I. A.] Russian Acad Sci, Ural Branch, Inst Electrophys, Ekaterinburg 620016, Russia
[Pchelkina, Z. V.] Russian Acad Sci, Ural Branch, Inst Met Phys, Ekaterinburg 620990, Russia
ИФ СО РАН
Siberian Branch, Kirensky Institute of Physics, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Ural Branch, Institute of Electrophysics, Russian Academy of Sciences, Yekaterinburg, 620016, Russian Federation
Ural Branch, Institute of Metal Physics, Russian Academy of Sciences, Yekaterinburg, 620990, Russian Federation

Доп.точки доступа:
Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Nekrasov, I. A.; Pchelkina, Z. V.
}
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10.


   
    Peculiarities of the time evolution of magnetoresistance of granular HTSC in a constant applied magnetic field / D. A. Balaev [et al.] // Solid State Commun. - 2008. - Vol. 147, Is. 7-8. - P. 284-287, DOI 10.1016/j.ssc.2008.05.044. - Cited References: 17. - This work was Supported by program "Quantum macrophysics" No. 3.4 of RAS and integration project No. 3.4 of SB RAS and in part by KSF, grant 18G011. D.A.B. and A.A.D. acknowledge the Russian Science Support Foundation. . - ISSN 0038-1098
РУБ Physics, Condensed Matter
Рубрики:
CRITICAL-STATE
   SUPERCONDUCTORS

   COMPOSITES

   HYSTERESIS

   RESISTANCE

Кл.слова (ненормированные):
superconductors -- flux pinning and creep -- tunneling -- Superconductors -- Flux pinning and creep -- Tunneling -- Agricultural products -- Carbon fiber reinforced plastics -- Copper oxides -- Electric conductivity -- Electric resistance -- Evolutionary algorithms -- Ferromagnetism -- Galvanomagnetic effects -- Grain (agricultural product) -- Health -- Hysteresis -- Magnetic devices -- Magnetic field effects -- Magnetic field measurement -- Magnetic fields -- Magnetic materials -- Magnetoelectronics -- Magnetoresistance -- Semiconductor metal boundaries -- Superconducting magnets -- Superconductivity -- Yttrium barium copper oxides -- p ,p ,t measurements -- Applied (CO) -- Applied magnetic fields -- Constant magnetic field (CMF) -- Elsevier (CO) -- Evolution (CO) -- External fields -- Field induced -- Flux creep -- Hysteretic behavior -- Josephson couplings -- Low magnetic fields -- Magnetic (CE) -- Poly crystalline -- Superconducting grains -- Time evolutions -- time relaxation -- Magnetism
Аннотация: The time evolution of the magnetoresistance of bulk YBCO + CuO composites at T = 4.2 K in constant applied magnetic fields was studied to clarify the mechanism of hysteretic behavior of magnetoresistance R(H) of granular HTSC. The composites represent "model" granular HTSC with weakened Josephson coupling between superconducting (YBCO) crystallites. It was found for the first time that on the ascending branch of R(H) dependence, the resistance at H = const decreased with time while on the descending branch, the resistance increased with time in ail applied constant magnetic field. In the range of low magnetic fields (below the minimum point of the descending branch of the R(H) dependence), the resistance at H const decreased again. Similar measurements performed oil pure polycrystalline YBCO at T = 77.4 K have shown that the behavior of evolution of resistance with time is similar to that observed for the composite. This proves the peculiarity of time evolution of maignetoresistance to be a common feature of granular HTSCs. The behavior revealed is well described by the model Of granular HTSC, where the intergrain media is in an effective magnetic field which is the superposition of the external field and the field induced by superconducting grains. The time evolution of resistance reflects the time relaxation of magnetization of HTSC grains due to the intragrain flux Creep Processes. (C) 2008 Elsevier Ltd. All rights reserved.

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Держатели документа:
[Balaev, D. A.
Dubrovskiy, A. A.
Shaykhutdinov, K. A.
Popkov, S. I.
Petrov, M. I.] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Popkov, S. I.; Попков, Сергей Иванович; Petrov, M. I.; Петров, Михаил Иванович
}
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11.


    Zhandun, V. S.
    Lattice dynamics, ferroelectric and antiferroeelctric instabilities, and the ferroelectric phase transition in disordered PbB(1/2)' B(1/2)'' O(3) (B ' = Ga, In, Lu; B '' = Nb, Ta) solid solutions / V. S. Zhandun, N. G. Zamkova, V. I. Zinenko // J. Exp. Theor. Phys. - 2008. - Vol. 106, Is. 6. - P. 1109-1117, DOI 10.1134/S1063776108060101. - Cited References: 29 . - ISSN 1063-7761
РУБ Physics, Multidisciplinary
Рубрики:
STATISTICAL-MECHANICS
   PEROVSKITES

   CRYSTALS

   ORDER

   RELAXOR

   BATIO3

   PBTIO3

Кл.слова (ненормированные):
Crystal lattices -- Ferroelectricity -- Lattice vibrations -- Solids -- Ferroelectric (barium strontium titanate) -- Ferroelectric phase transitions -- Lattice (CO) -- Lattice dynamics -- Vibration spectrum -- Ferroelectric materials
Аннотация: The lattice vibration spectra, rf permittivity, and dynamic Born charges of disordered PbB(1/2)'B(1/2)'' O(3) (B' = Ga, In, Lu; B '' = Nb, Ta) solid solutions are calculated in terms of the generalized Gordon-Kim model. All the compounds are found to have soft modes related to the center (Gamma(15)) and boundary point R (R(15)) of the Brillouin zone; the frequencies of these modes are close. The ferroelectric phase transition temperatures and the spontaneous polarization in the ferroelectric phase are calculated for the solid solutions using a model Hamiltonian in the local mode approximation and the Monte Carlo method. These temperatures for the tantalum compounds are found to be higher than for the niobium compounds, and temperature t(s) increases with the atomic number of ion B'. A model where the antiferroelectric state is related to the condensation of modes Gamma(15) and R(15) is proposed. It is found that, for all compounds except for PbSc(1/2)Nb(1/2)O(3) and PbSc(1/2)Ta(1/2)O(3), the ferroelectric phase, which is only related to the condensation of mode R(15), and the antiferroelectric phase have similar energies. In PbIn(1/2)Ta(1/2)O(3), the antiferroelectric phase turns out to be energetically favorable.

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Держатели документа:
[Zhandun, V. S.
Zamkova, N. G.
Zinenko, V. I.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Zamkova, N. G.; Замкова, Наталья Геннадьевна; Zinenko, V. I.; Зиненко, Виктор Иванович; Жандун, Вячеслав Сергеевич
}
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12.


   
    Magnetic field dependence of intergrain pinning potential in bulk granular composites YBCO plus CuO demonstrating large magneto-resistive effect / D. A. Balaev [et al.] // J. Supercond. Nov. Magn. - 2008. - Vol. 21, Is. 4. - P. 243-247, DOI 10.1007/s10948-008-0324-1. - Cited References: 22 . - ISSN 1557-1939
РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTORS
   ACTIVATED PHASE-SLIP

   TRANSITION

   DISSIPATION

   MECHANISM

   SENSORS

   MODEL

Кл.слова (ненормированные):
bulk granular High-T(C) superconductor -- magneto-resistive effect -- Josephson junction network -- inter-grain pinning potential -- Bulk granular High-T C superconductor -- Inter-grain pinning potential -- Josephson junction network -- Magneto-resistive effect -- Bulk composites -- Bulk granular High-T subC/sub superconductor -- Granular composites -- Inter-grain pinning potential -- Josephson junction network -- Magnetic field dependences -- Magneto-resistive effect -- Pinning potential -- Resistive effects -- Resistive transitions -- Wide temperature range -- Y-Ba-Cu-O -- Atmospheric temperature -- Barium -- Copper -- Copper oxides -- Electric resistance -- Magnetic field measurement -- Magnetic fields -- Magnetoresistance -- Magnetos -- Yttrium barium copper oxides -- Magnetic field effects
Аннотация: The broadening of the resistive transition in magnetic field and isotherms of magnetoresistance of bulk composites Y-Ba-Cu-O + CuO have been studied. These composites exhibit large magneto-resistive effect in a wide temperature range below T (C) due to weakening of Josephson coupling in this system. The broadening of the resistive transition and magnetoresistance are explained well by the Ambegaokar-Halperin (AH) model for phase slip in Josephson junctions. The magnetic field dependence of pinning potential in the intergrain boundaries deduced from AH model found out to be similar to that of critical current of an array of Josephson junctions. The values of pinning energy point out that the large magneto-resistive effect observed in the composites results from flux flow-like processes at the intergrain boundaries.

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Держатели документа:
[Balaev, D. A.
Dubrovskiy, A. A.
Popkov, S. I.
Shaykhutdinov, K. A.
Petrov, M. I.] RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics of RAS, 660036, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Popkov, S. I.; Попков, Сергей Иванович; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Petrov, M. I.; Петров, Михаил Иванович
}
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13.


   
    Magnetoresistance hysteresis in granular HTSCs as a manifestation of the magnetic flux trapped by superconducting grains in YBCO+CuO composites / D. A. Balaev [et al.] // J. Exp. Theor. Phys. - 2007. - Vol. 105, Is. 6. - P. 1174-1183, DOI 10.1134/S1063776107120084. - Cited References: 53 . - ISSN 1063-7761
РУБ Physics, Multidisciplinary
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTOR
   CRITICAL-CURRENT-DENSITY

   CURRENT-VOLTAGE CHARACTERISTICS

   BA-CU-O

   TRANSPORT-PROPERTIES

   FIELD

   YBA2CU3O7-DELTA

   FLUCTUATIONS

   FINGERPRINT

   NETWORK

Кл.слова (ненормированные):
Critical currents -- Hysteresis -- Hysteresis loops -- Josephson junction devices -- Magnetic flux -- Magnetoresistance -- Yttrium barium copper oxides -- Granular superconductors -- Hysterestic dependence -- Negative magnetoresistance -- Transport current -- Composite materials
Аннотация: Hysterestic behavior of the magnetoresistance of granular HTSCs and its interaction with the magnetic hysteresis are studied by measuring magnetoresistance R(H) and critical current I-c(H) of composites formed by HTSC Y0.75Lu0.25Ba2CU3O7 and CuO. A network of Josephson junctions is formed in such composites, in which the nonsuperconducting component plays the role of barriers between HTSC grains. Hysteretic dependences R(H) of magnetoresistance are studied in a wide range of transport current density j and are analyzed in the framework of the two-level model of a granular superconductor, in which dissipation takes place in the Josephson medium and the magnetic flux can be pinned both in grains and in the Josephson medium. The interrelation between the hysteresis of critical current I-c(H) and the evolution of the hysterestic dependence R(H) of the magnetoresistance upon transport current variation is demonstrated experimentally. The effect of the magnetic past history on the hysteretic behavior of R(H) and the emergence of a segment with a negative magnetoresistance are analyzed. It is shown for the first time that the R(H) dependences are characterized by a parameter that is independent of the transport current, viz., the width of the R(H) hysteresis loop.

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Держатели документа:
[Balaev, D. A.
Gokhfeld, D. M.
Dubrovskii, A. A.
Popkov, S. I.
Shaikhutdinov, K. A.
Petrov, M. I.] Russian Acad Sci, Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Dubrovskii, A. A.; Дубровский, Андрей Александрович; Popkov, S. I.; Попков, Сергей Иванович; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Petrov, M. I.; Петров, Михаил Иванович
}
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14.


   
    Hysteretic behavior of the magnetoresistance and the critical current of bulk Y3/4Lu1/4Ba2CU3O7+CuOcomposites in a magnetic field / D. A. Balaev [et al.] // Physica C. - 2007. - Vol. 460: 8th International Conference on Materials and Mechanisms of Superconductivity and High Temperature Superconductors (JUL 09-14, 2006, Dresden, GERMANY). - P. 1307-1308, DOI 10.1016/j.physc.2007.03.346. - Cited References: 7 . - ISSN 0921-4534
РУБ Physics, Applied
Рубрики:
SUPERCONDUCTORS
Кл.слова (ненормированные):
HTSC -- resistivity -- magnetic field -- relaxation -- HTSC -- Magnetic field -- Relaxation -- Resistivity -- Crystallites -- Magnetic fields -- Magnetic hysteresis -- Magnetoresistance -- Yttrium barium copper oxides -- Superconducting crystallites -- Superconducting systems -- Tunnel-type Josephson junctions -- Josephson junction devices
Аннотация: The hysteretic behavior of critical current j(C)(H) and magneto-resistance R(H) of composites Y-Ba-Cu-O + CuO have been studied and presented. The composites represent the network of tunnel-type Josephson junctions where copper oxide acts as a material forming barriers between superconducting (YBCO) crystallites. The characteristic features of R(H) and j(C)(H) dependences are discussed in the frames of the conception of "two level superconducting system" (the Josephson media and HTSC crystallites) which is realized in the composites under study. (c) 2007 Elsevier B.V. All rights reserved.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Popkov, S. I.; Попков, Сергей Иванович; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Petrov, M. I.; Петров, Михаил Иванович
}
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15.


   
    Time relaxation of residual resistance of HTSC-based composites / D. A. Balaev [et al.] // Physica C. - 2007. - Vol. 460: 8th International Conference on Materials and Mechanisms of Superconductivity and High Temperature Superconductors (JUL 09-14, 2006, Dresden, GERMANY). - P. 1309-1310, DOI 10.1016/j.physc.2007.03.347. - Cited References: 5 . - ISSN 0921-4534
РУБ Physics, Applied
Рубрики:
SUPERCONDUCTORS
Кл.слова (ненормированные):
granular HTSC -- resistance -- relaxation -- magnetic flux -- Granular HTSC -- Magnetic flux -- Relaxation -- Resistance -- Copper oxides -- Crystallites -- Magnetic flux -- Magnetic relaxation -- Magnetization -- Yttrium barium copper oxides -- Anderson-like relaxation processes -- Flux trapping -- Residual resistance -- Time relaxation -- Josephson junction devices
Аннотация: Magnetoresistance curves R(H) and time relaxation of the residual resistance of bulk YBCO + CuO composites have been studied. These composites represent the network of Josephson junctions, where CuO acts as a barrier between YBCO grains. It has been shown that hysteresis of the R(H) dependences is related to the flux trapping within the YBCO crystallites. This flux induces magnetic field in the intergrain media. Time relaxation of the residual resistance is caused by relaxation of the magnetization of YBCO grains. The time dependence of the residual resistance obeys a logarithmic law, which describes the Anderson-like relaxation processes in the YBCO grains. (c) 2007 Elsevier B.V. All rights reserved.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Popkov, S. I.; Попков, Сергей Иванович; Petrov, M. I.; Петров, Михаил Иванович
}
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16.


   
    Heat capacity and thermal expansion study of Ba0.9Bi0.067(Ti1-xZrx)O-3 ceramics / M. . Gorev [et al.] // J. Phys.: Condens. Matter. - 2007. - Vol. 19, Is. 34. - Ст. 346237, DOI 10.1088/0953-8984/19/34/346237. - Cited References: 15 . - ISSN 0953-8984
РУБ Physics, Condensed Matter
Рубрики:
BA(TI1-XZRX)O-3
   STATE

Кл.слова (ненормированные):
Adiabatic calorimeters -- Temperature range -- Temperature regions -- Thermal expansion anomaly -- Barium -- Ceramic materials -- Dielectric properties -- Expansion -- Specific heat -- Zirconium -- Thermal expansion
Аннотация: For Ba0.9Bi0.067(Ti1-xZrx)O-3 (x = 0.04, 0.15) ceramics, the heat capacity C-p(T) and the thermal expansion alpha(T) were measured using an adiabatic calorimeter and an optical-mechanical dilatometer in the temperature range 100-420 K. Both compounds reveal diffuse heat capacity and thermal expansion anomalies: three anomalies in the temperature regions 150-250 K, 250-300 K (alpha(T) only) and 300-400 K at x = 0.04 and two anomalies in the regions 200 250 K and 250-350 K at x = 0.15. The results obtained are discussed together with the data on the dielectric properties.

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Держатели документа:
[Gorev, Michail
Bondarev, Vitaly
Flerov, Igor] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
[Maglione, Mario
Simon, Annie] Univ Bordeaux 1, CNRS, ICMCB, F-33608 Pessac, France
ИФ СО РАН
LVKirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
ICMCB-CNRS, Universite de Bordeaux i, 87 avenue ASchweitzer, 33608 Pessac, France

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Flerov, I. N.; Флёров, Игорь Николаевич; Maglione, M.; Simon, A.
}
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17.


   
    Effect of strontium and barium doping on the magnetic state and electrical conductivity of GdCoO3 / N. B. Ivanova [et al.] // Phys. Solid State. - 2007. - Vol. 49, Is. 8. - P. 1498-1506, DOI 10.1134/S1063783407080161. - Cited References: 36 . - ISSN 1063-7834
РУБ Physics, Condensed Matter
Рубрики:
PEROVSKITE
   ORDER

   OXIDE

   BEHAVIOR

   GLASSES

   LACOO3

   PR

   GD

   SM

   ND

Аннотация: A coordinated investigation of the magnetic and electrical properties of polycrystalline cobalt oxide compounds CdCoO3, Gd0.9Ba0.1CoO3, and Gd0.9Sr0.1CoO3 is carried out. Undoped GdCoO3 reveals a low conductivity; a magnetic moment of 7.4 mu(B) per molecule, which is less than the theoretical value for the Gd3+ ion; and an asymptotic Curie temperature of -6 K. Doping GdCoO3 with barium and strontium to substitution of 10 at. % Gd brings about an increase in the conductivity and magnetic transitions at T = 300 K for Gd0.9Ba0.1CoO3 and T = 170 K for Gd0.9Sr0.1CoO3. The magnetization anomalies imply the formation of magnetic clusters. The behavior of the electrical conductivity at high temperatures suggests a variable activation energy. At low temperatures, Mott hopping conduction sets in.

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Публикация на русском языке Влияние допирования стронцием и барием на магнитное состояние и электропроводность GdCoO[3] [Текст] / Н. Б. Иванова [и др.] // Физ. тверд. тела. - 2007. - Т. 49 Вып. 8. - С. 1427-1435

Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Univ Guadalajara, CUCEI, Dept Fis, Guadalajara 44430, Jalisco, Mexico
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Departmento de Fisica, C.U.C.E.I., Universidade de Guadalajara, Guadalajara, Jalisco 44430, Mexico

Доп.точки доступа:
Ivanova, N. B.; Иванова, Наталья Борисовна; Kazak, N. V.; Казак, Наталья Валерьевна; Michel, C. R.; Balaev, A. D.; Балаев, Александр Дмитриевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Vasil'ev, A. D.; Васильев, Александр Дмитриевич; Bulina, N. V.; Булина, Наталья Васильевна; Panchenko, E. B.
}
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18.


   
    Study of dependence upon the magnetic field and transport current of the magnetoresistive effect in YBCO-based bulk composites / D. A. Balaev [et al.] // Supercond. Sci. Technol. - 2007. - Vol. 20, Is. 6. - P. 495-499, DOI 10.1088/0953-2048/20/6/002. - Cited References: 25 . - ISSN 0953-2048
РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
CERAMIC SUPERCONDUCTORS
   DISSIPATION

   TRANSITION

   SENSORS

   MOTION

   FILMS

Кл.слова (ненормированные):
Current voltage characteristics -- Lorentz force -- Magnetic field effects -- Magnetic flux -- Magnetic sensors -- Magnetoresistance -- Intergrain boundaries -- Magnetic field sensor devices -- Magnetoresistance curves -- Magnetoresistive properties -- Yttrium barium copper oxides
Аннотация: The magnetoresistive properties of bulk YBCO + CuO and YBCO + BaPb0.75Sn0.25O3 composites for different orientations of external magnetic field H and macroscopic transport current j have been measured. These composites exhibit large magnetoresistance in weak magnetic fields (< 100 Oe), which makes them promising candidates for practical application in magnetic field sensor devices. The difference between.( T) dependences, magnetoresistance curves R( H) and current - voltage characteristics measured for H parallel to j and H || j is observed indicating the presence of the Lorentz- force- dependent dissipation in the composites. Angular dependences of magnetoresistance R(theta) ( where theta = angle H, j) of the composites in weak magnetic fields are found to be proportional to sin(2)theta. This fact suggests that the flux flow in the intergrain boundaries is responsible for the large magnetoresistive effect observed in the composites.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Prus, A. G.; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Petrov, M. I.; Петров, Михаил Иванович
}
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19.


    Gokhfeld, D. M.
    Description of hysteretic current-voltage characteristics of superconductor-normal metal-superconductor junctions / D. M. Gokhfeld // Supercond. Sci. Technol. - 2007. - Vol. 20, Is. 1. - P. 62-66, DOI 10.1088/0953-2048/20/1/011. - Cited References: 24 . - ISSN 0953-2048
РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTOR
   WEAK LINKS

   POLYCRYSTALLINE HTSC

   ANDREEV REFLECTION

   SIMPLIFIED MODEL

   COMPOSITES

   TRANSPORT

Кл.слова (ненормированные):
Computational methods -- Current voltage characteristics -- Electric resistance -- Josephson junction devices -- Mathematical models -- Yttrium barium copper oxides -- Andreev reflection -- Metal superconductor junctions -- Metallic Josephson junction -- Weak links -- Semiconductor junctions
Аннотация: A simplified model for the current-voltage characteristics of weak links is suggested. It is based on an approach considering the multiple Andreev reflection in a metallic Josephson junction. The model allows one to calculate the current-voltage characteristics of superconductor-normal metal-superconductor junctions with different thicknesses of normal layer at different temperatures. A hysteretic peculiarity of the V(I) dependence is described as a result of the negative differential resistance. The current-voltage characteristics of tin microbridges and high- T-c composite YBCO + BaPbO3 were computed.

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Держатели документа:
RAS, SD, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
L V Kirensky Institute of Physics, SD RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Гохфельд, Денис Михайлович
}
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20.


   
    Heat capacity and thermal expansion study of relaxor-ferroelectric Ba0.92Ca0.08Ti0.76Zr0.24O3 / M. . Gorev [et al.] // J. Phys.: Condens. Matter. - 2004. - Vol. 16, Is. 39. - P. 7143-7150, DOI 10.1088/0953-8984/16/39/045. - Cited References: 18 . - ISSN 0953-8984
РУБ Physics, Condensed Matter
Рубрики:
CERAMICS
   BA(TI1-XZRX)O-3

   PEROVSKITES

Кл.слова (ненормированные):
Calorimetry -- Dielectric properties -- Ferroelectric materials -- Perovskite -- Phase transitions -- Solid solutions -- Specific heat -- Thermal expansion -- Adiabatic calorimetry -- Frequency dispersion -- Polar domains -- Relaxor ferroelectrics -- Barium compounds
Аннотация: Heat capacity and thermal expansion of the Ba0.92Ca0.08Ti0.76Zr0.24O3 compound is measured using the methods of adiabatic calorimetry and optic-mechanical dilatometry in the temperature range 100-370 K. Three blurred anomalies on the C-p(T) and alpha(T) dependencies are observed in the temperature range 200-360 K. The results of the studies are discussed together with data on the structure and dielectric properties in the framework of spherical random bond-random field model.

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Держатели документа:
CNRS, CEMES, F-31055 Toulouse, France
ИФ СО РАН
L V kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Sciau, P.; Savariault, J. M.
}
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