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Magnetization and magnetic circular dichroism of La0.7Sr0.3MnO3/YSZ polycrystalline films / Y. E. Greben'kova [et al.] // Phys. Solid State. - 2013. - Vol. 55, Is. 4. - P. 842-849, DOI 10.1134/S1063783413040124. - Cited References: 22. - This study was supported by the Russian Foundation for Basic Research (project nos. 11-02-00972 and 12-02-92607). . - 8. - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
MAGNETOOPTICAL PROPERTIES
MANGANITES
Аннотация: The magnetic and magneto-optical properties as well as the surface morphology and structure of La0.7Sr0.3MnO3 polycrystalline films of different thicknesses have been investigated. It has been shown that films have a rough surface with a characteristic in-plane linear dimension of similar to 30 nm, and crystallites with linear dimensions of 10-20 nm are randomly oriented in the plane. The temperature and field dependences of the magnetization of the films indicate their magnetic inhomogeneity. The magnetic circular dichroism spectra contain a number of bands, one of which at 2.4 eV is explained by the contribution of conduction electrons.

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Публикация на русском языке Намагниченность и магнитный круговой дихроизм поликристаллических пленок La0.7Sr0.3MnO3/YSZ // Физика твердого тела. - 2013. - Т. 55, Вып. 4. - С. 771-778

Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Russian Acad Sci, Boreskov Inst Catalysis, Siberian Branch, Novosibirsk 630090, Russia
Natl Univ Sci & Technol MISiS, Moscow 119049, Russia;

Доп.точки доступа:
Greben'kova, Yu.E.; Гребенькова, Юлия Эрнестовна; Sokolov, A. E.; Соколов, Алексей Эдуардович; Eremin, E. V.; Еремин, Евгений Владимирович; Edel'man, I. S.; Эдельман, Ирина Самсоновна; Marushchenko, D. A.; Марущенко, Дмитрий Анатольевич; Zaikovskii, V. I.; Chichkov, V. I.; Andreev, N. V.; Mukovskii, Y. M.
}
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Physics, Applied
C94

Cuprates, manganites and cobaltites: Multielectron approach to the band structure / M. M. Korshunov [et al.] // Mod. Phys. Lett. B. - 2012. - Vol. 26, Is. 24. - Ст. 1230016, DOI 10.1142/S0217984912300165. - Cited References: 93. - We are thankful to O. K. Andersen, V. I. Anisimov, A. F. Barabanov, K. I. Kikoin, N. M. Plakida, S. Sakai, A.-M.S. Tremblay, V. V. Val'kov, and R. O. Zaitsev for useful discussions. This work was supported by the Presisium of RAS program Quantum physics of condensed matter N 20.7, Grant "Leading scientific schools of Russia" (NSh 1044-2012.2), RFBR (Grant No. 09-02-00127), Integration Grant of SBRAS-UrBRAS N 44, Grant of President of Russia MK-1683.2010.2, FCP Scientific and Research-and-Educational Personnel of Innovative Russia for 2009-2013 (GK 16.740.12.0731 and GK 16.740.11.0740), and Siberian Federal University (Theme N F-11). M.M.K. and E.I.S. acknowledges support from The Dynasty Foundation and ICFPM. . - ISSN 0217-9849

РУБ Physics, Applied + Physics, Condensed Matter + Physics, Mathematical
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTORS
   MEAN-FIELD THEORY
   DENSITY-FUNCTIONAL FORMALISM
   CORRELATED ELECTRON-SYSTEMS
   TRANSITION-METAL COMPOUNDS
   SPIN-STATE TRANSITION
   T-J MODEL
   MAGNETIC-PROPERTIES
   COPPER OXIDES
   LaCoO3
Кл.слова (ненормированные):
LDA plus GTB method -- strongly-correlated systems -- band structure
Аннотация: High-T-c superconductors with CuO2 layers, manganites La1-xSrxMnO3 and cobaltites LaCoO3 present several mysteries in their physical properties. Most of them are believed to come from the strongly-correlated nature of these materials. From the theoretical viewpoint, there are many hidden rocks in making the consistent description of the band structure and low-energy physics starting from the Fermi-liquid approach. Here, we discuss the alternative method - multielectron approach to the electronic structure calculations for the Mott insulators - called LDA + GTB (local density approximation + generalized tight-binding) method. Its origin is a straightforward generalization of the Hubbard perturbation theory in the atomic limit and the multiband p - d Hamiltonian with the parameters calculated within LDA. We briefly discuss the method and focus on its applications to cuprates, manganites and cobaltites.

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Держатели документа:
[Korshunov, M. M.
Ovchinnikov, S. G.
Shneyder, E. I.
Gavrichkov, V. A.
Orlov, Yu. S.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Korshunov, M. M.
Ovchinnikov, S. G.
Gavrichkov, V. A.
Orlov, Yu. S.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Shneyder, E. I.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
[Nekrasov, I. A.] Russian Acad Sci, Inst Electrophys, Ekaterinburg 620016, Russia
[Pchelkina, Z. V.] Russian Acad Sci, Inst Met Phys, Ekaterinburg 620219, Russia
L. V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Svobodny Prospect 79, Krasnoyarsk 660041, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation
Institute for Electrophysics, Russian Academy of Sciences, Ekaterinburg 620016, Russian Federation
Institute for Metal Physics, Russian Academy of Sciences, Ekaterinburg 620219, Russian Federation

Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Shneyder, E. I.; Шнейдер, Елена Игоревна; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Orlov, Yu.S.; Орлов, Юрий Сергеевич; Nekrasov, I. A.; Pchelkina, Z. V.
}
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Visible magnetic circular dichroism spectroscopy of the Pr0.8Sr0.2MnO3 and Pr0.6Sr0.4MnO3 thin films / I. S. Edelman [et al.] // AIP Adv. - 2014. - Vol. 4, Is. 5. - Ст. 057125, DOI 10.1063/1.4879818. - Cited References: 30. - The work was supported partly by the Russian Foundation for Basic Researches, grant No’s 14-02-01211, 12-02-00717-a and Grant of the Russian President No Sh-2886.2014.2 . - ISSN 2158-3226

РУБ Nanoscience & Nanotechnology + Materials Science, Multidisciplinary + Physics, Applied
Рубрики:
MANGANITES
   LA1-XSRXMNO3
   PEROVSKITES
   SPECTRA
Аннотация: Visiblemagnetic circular dichroism (MCD) in Pr1-xSrxMnO3 with x=0.2 and 0.4was investigated for the first time. Samples for the investigation – polycrystalline films with thickness from 20 to 150 nm were prepared with the dc magnetron sputtering. MCD spectra obtained in the energy interval 1–4 eV at temperatures 100–300 K consist of several maxima with different intensities: very strong one near 3.25–3.4 eV and a broad essentially weaker band near 2 eV. An additional maximum of opposite sign arises in the samples with x = 0.4MCD spectrum at 2.33 eV. Experimental spectra were decomposed to several Gaussian components, and their amplitudes temperature dependences were analyzed. In the case of x = 0.2, all four Gaussian components are characterized by the identical temperature dependence of their amplitudes. In the case of x = 0.4, maxima observed in different spectral intervals demonstrate different temperature dependences of their amplitudes. One more unexpected phenomenon is associated with the different MCD value change in different spectral intervals when coming from x = 0.2 to x = 0.4: high-energy maximum increases more than twice while low-energy maxima intensity stays at that, practically, unchanged.

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Держатели документа:
LV Kirensky Inst Phys SB RAS, Krasnoyarsk 660036, Russia
Natl Univ Sci & Technol MISiS, Moscow 119049, Russia

Доп.точки доступа:
Edelman, I. S.; Эдельман, Ирина Самсоновна; Greben'kova, Yu. E.; Гребенькова, Юлия Эрнестовна; Sokolov, A. E.; Соколов, Алексей Эдуардович; Molokeev, M. S.; Молокеев, Максим Сергеевич; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Chichkov, V. I.; Andreev, N. V.; Mukovskii, Y.
}
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Dielectric and electrical properties of polymorphic bismuth pyrostannate Bi2Sn2O7 / L. V. Udod [et al.] // Phys. Solid State. - 2014. - Vol. 56, Is. 7. - P. 1315-1319, DOI 10.1134/S1063783414070336. - Cited References: 20. - This study was supported by the Russian Foundation for Basic Research (project nos. 09-02-00125-a, 14-02-92003 NNS_a, 14-02-90010_Bel_a, and 14-12-00124). . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
STRONG MAGNETIC-FIELD
   DOPED MANGANITES
   MAGNETORESISTANCE
   Bi2O3
Аннотация: The Bi2Sn2O7 compound existing simultaneously in two polymorphic modifications, namely, orthorhombic and cubic, has been synthesized for the first time by solid-phase synthesis. The dielectric and electrical properties of the compound have been studied in the temperature range 100 K ˂ T ˂ 500 K. Anomalies in the temperature dependences of the electrical resistivity and the permittivity (imaginary and real parts) have been found at both low and high temperatures. These features are explained in terms of the model of martensitic phase transitions.

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Публикация на русском языке Диэлектрические и электрические свойства полиморфного пиростаната висмута Bi2Sn2O7 [Текст] / Л. В. Удод [и др.] // Физ. тверд. тела : ФТИ РАН, 2014. - Т. 56 Вып. 7. - С. 1267-1271

Держатели документа:
Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Udod, L. V.; Удод, Любовь Викторовна; Aplesnin, S. S.; Аплеснин, Сергей Степанович; Sitnikov, M. N.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Russian Foundation for Basic Research [09-02-00125-a, 14-02-92003 NNS_a, 14-02-90010_Bel_a, 14-12-00124]
}
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Aplesnin, S. S.
Magnetotransport effects in paramagnetic GdxMn1-xS / S. S. Aplesnin, M. N. Sitnikov // JETP Letters. - 2014. - Vol. 100, Is. 2. - P. 95-101, DOI 10.1134/S0021364014140021. - Cited References: 12. - This work was supported by the Russian Foundation for Basic Research (project nos. 12-02-00125-a and 14-02-90010-Bel_a). . - ISSN 0021-3640. - ISSN 1090-6487

РУБ Physics, Multidisciplinary
Рубрики:
PHASE-SEPARATION
SPINTRONICS
MANGANITES
Аннотация: The electrical resistance of GdxMn1 − xS solid solutions with x = 0.1, 0.15, and 0.2 has been measured at magnetic field H = 0.8 T and at zero magnetic field within the 100 K ˂ T ˂ 550 K temperature range. The magnetoresistance peak is observed above room temperature. On heating, the composition with x = 0.2 exhibits the change of magnetoresistance sign from positive to negative and the magnetoresistance peak near the transition to the magnetically ordered state. The experimental data are interpreted in the framework of the model involving the orbital ordering of electrons and the arising electrical polarization leading to the changes in the spectral density of states for electrons in the vicinity of the chemical potential in the applied magnetic field.

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Публикация на русском языке Аплеснин, Сергей Степанович. Магнитотранспортные эффекты в парамагнитном состоянии в GdxMn1−xS [Текст] / С. С. Аплеснин, М. Н. Ситников // Письма в "Журнал экспериментальной и теоретической физики" : Наука, 2014. - Т. 100 Вып. 1-2. - С. 104-110

Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia

Доп.точки доступа:
Sitnikov, M. N.; Ситников, Максим Николаевич; Аплеснин, Сергей Степанович; Russian Foundation for Basic Research [12-02-00125-a, 14-02-90010-Bel_a]
}
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Ferromagnetism in single-valent manganites / I. O. Troyanchuk [et al.] // J. Alloys Compd. - 2015. - Vol. 619. - P. 719-725, DOI 10.1016/j.jallcom.2014.08.236. - Cited References: 46. - The authors would like to thank J.B. Goodenough for the fruitful discussion. This work has been supported by Belarusian Republican Foundation for Fundamental Research (Grant F14R-040). . - ISSN 0925-8388. - ISSN 1873-4669

РУБ Chemistry, Physical + Materials Science, Multidisciplinary + Metallurgy & Metallurgical Engineering
Рубрики:
PHASE-SEPARATION
   DOPED MANGANITES
   DOUBLE EXCHANGE
   DIFFRACTION
   OXIDES
   NMR
Кл.слова (ненормированные):
Magnetically ordered materials -- Solid state reactions -- Exchange and superexchange -- Magnetic measurements -- Neutron diffraction
Аннотация: Structural and magnetization measurements have been performed on the La0.7Sr0.3Mn0.85 Nb 0.15 - x 5 + Mg x 2 + O3 stoichiometric compounds. With rise of the Mg2+ content the formal oxidation state manganese increases from +3 ( x = 0 ) up to +3.55 ( x = 0.15 ) . The compositions with 0 ⩽ x ≤ 0.08 undergo a structural transition from rhombohedral to orthorhombic symmetry below room temperature whereas x = 0.1 and x = 0.15 compounds are rhombohedral down to 2 K. The structural parameters evidence that the orthorhombic phase is not long-range orbitally ordered and that the structural transition is associated with a steric effect. The Mg-free compound is ferromagnetic with the Curie point of around 150 K and a magnetic moment of 3.1 μ B /Mn. The substitution of Nb5+ with Mg2+ leads to a gradual weakening of the ferromagnetic component while in the x = 0.15 compound A-type antiferromagnetic short-range order is stabilized in spite of macroscopic R 3 ¯ c symmetry. All the compositions show insulating behavior. It is suggested that ferromagnetism is originated from superexchange interactions via oxygen. Covalence enhances the positive part of the superexchange interactions whereas structural disorder induced by Nb5+ and Mg2+ ions leads to suppression of ferromagnetism.

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Держатели документа:
Sci Pract Mat Res Ctr NAS Belarus, Minsk 220072, Byelarus
Helmholtz Zentrum Berlin, D-14109 Berlin, Germany
Joint Inst Nucl Res, Dubna 141980, Russia
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France
ISMRA Univ Caen, UMR Associee CNRS 6508, Lab CRISMAT, F-14050 Caen, France
Univ Caen, F-14050 Caen, France

Доп.точки доступа:
Troyanchuk, I. O.; Bushinsky, M. V.; Sikolenko, V.; Efimov, V.; Volkov, N. V.; Волков, Никита Валентинович; Tobbens, D. M.; Ritter, C.; Raveau, B.
}
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Role of superexchange interactions in the ferromagnetism of manganites / I. O. Troyanchuk [et al.] // J. Exp. Theor. Phys. - 2015. - Vol. 120, Is. 1. - P. 97-102, DOI 10.1134/S1063776115010173. - Cited References:25. - This work was supported by the Belarussian Foundation for Basic Research, project no. F12SO-026. . - ISSN 1063. - ISSN 1090-6509. -

РУБ Physics, Multidisciplinary
Рубрики:
PHASE
NMR
Аннотация: Compound La0.7Sr0.3Mn0.85Nb0.15O3, in which manganese ions are in an oxidation state close to 3+, are studied by neutron diffraction and magnetic measurements. This compound is shown to be a ferromagnet with T C = 145 K and a magnetic moment of 3.1 μB/Mn at T = 10 K. No signs of cooperative orbital ordering are detected. When Mg2+ ions substitute for some Nb5+ ions, Mn4+ ions appear but ferromagnetism is not enhanced. An increase in the structural distortions leads to a decrease in the ferromagnetic component. The ferromagnetic state is assumed to be caused by substantial hybridization of the e g orbitals of manganese and oxygen, which increases the positive part of the superexchange interactions.

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Публикация на русском языке Роль сверхобменных взаимодействий в ферромагнетизме манганитов [Текст] / И. О. Троянчук [и др.] // Журн. эксперим. и теор. физ. : Наука, 2015. - Т. 147 Вып. 1. - С. 112-118

Держатели документа:
Natl Acad Sci Belarus, Sci & Pract Mat Res Ctr, Minsk 220072, Byelarus.
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.
Helmholtz Ctr Berlin, D-14109 Berlin, Germany.
Joint Inst Nucl Res, Dubna 141980, Moscow Oblast, Russia.
Inst Laue Langevin, F-38042 Grenoble 9, France.

Доп.точки доступа:
Troyanchuk, I. O.; Bushinsky, M. V.; Volkov, N. V.; Волков, Никита Валентинович; Sikolenko, V.; Efimova, E. A.; Ritter, C.
}
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Positive magnetoresistance of single-crystal bilayer manganites (La1−zNdz)1.4Sr1.6Mn2O7 (z = 0, 0.1) / K. A. Shaykhutdinov [et al.] // J. Appl. Phys. - 2015. - Vol. 117, Is. 16. - Ст. 163918, DOI 10.1063/1.4918916. - Cited References:24 . - ISSN 0021. - ISSN 1089-7550. -

РУБ Physics, Applied
Рубрики:
MAGNETIC PHASE-DIAGRAM
COLOSSAL MAGNETORESISTANCE
LAYERED MANGANITES
Аннотация: We investigate magnetoresistance, rho(c), of single-crystal bilayer lanthanum manganites (La1-zNdz)(1.4)Sr1.6Mn2O7 (z - 0 and 0.1) at a transport current flowing along the crystal c axis and in external magnetic fields applied parallel to the crystal c axis or ab plane. It is demonstrated that the La1.4Sr1.6Mn2O7 manganite exhibits the positive magnetoresistance effect in the magnetic field applied in the ab sample plane at the temperatures T 60 K, along with the negative magnetoresistance typical of all the substituted lanthanum manganites. In the (La0.9Nd0.1)(1.4)Sr1.6Mn2O7 sample, the positive magnetoresistance effect is observed at temperatures of 60-80K in an applied field parallel to the c axis. The mechanism of this effect is shown to be fundamentally different from the colossal magnetoresistance effect typical of lanthanum manganites. The positive magnetoresistance originates from spin-dependent tunneling of carriers between the manganese-oxygen bilayers and can be explained by features of the magnetic structure of the investigated compounds. (C) 2015 AIP Publishing LLC.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Nikitin, S. E.; Никитин, Станислав Евгеньевич; Petrov, M. I.; Петров, Михаил Иванович; Terent'yev, K. Yu.; Терентьев, Константин Юрьевич; Semenov, S. V.; Семёнов, Сергей Васильевич; Popkov, S. I.; Попков, Сергей Иванович
}
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    Structural, electrical and magnetic study of manganites Pr0.6Sr0.4MnO3 thin films / D. S. Neznakhin [et al.] // J. Phys. Conf. Ser. - 2016. - Vol. 690, Is. 1, DOI 10.1088/1742-6596/690/1/012002. - Cited References: 20. - The work was supported partly by RFBR, grant №14-02-01211, Grant of President of Russian Federation №NSh-2886.2014.2, and by The Ministry of Education and Science of the Russian Federation, project №2582. . - ISSN 1742-6588
   Перевод заглавия: Структурные, электрические и магнитные исследования тонких пленок манганита Pr0.6Sr0.4MnO3
Кл.слова (ненормированные):
Magnetic materials -- Magnetization -- Manganese oxide -- Nanoelectronics -- Nanostructures -- Oxide films -- Field dependence -- Magnetization temperature curves -- Polycrystalline phase -- Polycrystalline pr -- Resistivity dependence -- Shape characteristics -- Structural parameter -- Zero-field cooling -- Thin films
Аннотация: Thin polycrystalline Pr0.6Sr0.4MnO3 films were grown on the Y stabilized zirconium oxide substrates by magnetron sputtering using RF power and off-axis sputtering scheme with double cathodes. Only one polycrystalline phase with structural parameters consistent with that for the corresponding bulk sample was revealed in the films. Electric resistivity dependence on temperature demonstrates the shape characteristic for the substances with the Mott transition. The difference between magnetization temperature curves measured in the zero field cooling and field cooling modes was revealed. Magnetization field dependences were presented by the hysteresis loops changing their form with temperature. © Published under licence by IOP Publishing Ltd.

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Доп.точки доступа:
Neznakhin, D. S.; Samoshkina, Yu. E.; Самошкина, Юлия Эрнестовна; Molokeev, M. S.; Молокеев, Максим Сергеевич; Semenov, S. V.; Семёнов, Сергей Васильевич; Russian Youth Conference on Physics of Semiconductors and Nanostructures, Opto- and Nanoelectronics(St. Petersburg)(17 ; 23 - 27 Nov. 2015)
}
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10.

Current-voltage characteristics of polycrystalline (La0.5Eu0.5)(0.7)Pb0.3MnO3 at low temperatures / K. A. Shaikhutdinov [et al.] // Phys. Solid State. - 2011. - Vol. 53, Is. 12. - P. 2455-2458, DOI 10.1134/S1063783411120213. - Cited References: 16. - This study was supported in part by the Siberian Branch of the Russian Academy of Sciences (within the framework of the Lavrent'ev Competition of Young Scientists' Projects (project no. 12). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
MANGANITES
Аннотация: The current-voltage characteristics of the polycrystalline substituted lanthanum manganite (La0.5Eu0.5)(0.7)Pb0.3MnO3 have been measured at temperatures close to the metal-insulator transition temperature and at low temperatures. In both cases, the current-voltage characteristics exhibit nonlinear properties that are strongly dependent on the strength of an applied magnetic field. The mechanisms responsible for the nonlinear properties at these temperatures are found to be different: near the metal-insulator transition, the current-voltage characteristics are determined by the phase layering inside granules, while at low temperatures, they are determined by tunneling of carriers through insulating interlayers of the granules.

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Держатели документа:
[Shaikhutdinov, K. A.
Balaev, D. A.
Popkov, S. I.
Semenov, S. V.
Sapronova, N. V.
Volkov, N. V.] Russian Acad Sci, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Balaev, D. A.; Балаев, Дмитрий Александрович; Popkov, S. I.; Попков, Сергей Иванович; Semenov, S. V.; Семенов, Сергей Васильевич; Sapronova, N. V.; Volkov, N. V.; Волков, Никита Валентинович
}
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