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    Broad-Band Emission in a Zero-Dimensional Hybrid Organic [PbBr6] Trimer with Intrinsic Vacancies / J. Zhou [et al.] // J. Phys. Chem. Lett. - 2019. - Vol. 10, Is. 6. - P. 1337-1341, DOI 10.1021/acs.jpclett.9b00238. - Cited References: 28. - This work was supported by the National Natural Science Foundation of China (Grant Nos. 51722202, 91622125, 51572023, 11574003, 21833009, and 21533010) and the Natural Science Foundation of Beijing (2172036). We were grateful to Prof. Keli Han for his support to supply the femtosecond transient absorption spectroscopy device. . - ISSN 1948-7185
   Перевод заглавия: Широкополосная эмиссия в нульмерном гибридном органическом тримере [PbBr6] с внутренними вакансиями

РУБ Chemistry, Physical + Nanoscience & Nanotechnology + Materials Science, Multidisciplinary + Physics, Atomic, Molecular & Chemical
Рубрики:
WHITE-LIGHT EMISSION
HALIDE PEROVSKITES
LUMINESCENCE
Аннотация: The understanding of broad-band emission mechanisms on low-dimensional metal halides is an urgent need for the design principle of these materials and their photoluminescence tuning. Herein, a new zero-dimensional (0D) organic–inorganic hybrid material (C9NH20)6Pb3Br12 has been discovered, in which face-sharing PbBr6 trimer clusters crystallize with organic cations (C9NH20+), forming periodic structure with 0D blocks. Broad-band green emission peaking at about 522 nm was observed for this material, with a full width at half-maximum (fwhm) of 134 nm. The emission was attributed to excitons trapped at controlled intrinsic vacancies, and this is the new example in 0D metal halides, also confirmed by spectroscopy analysis and first-principles calculations. Discovery of the single-crystalline hybrid material and observation of defect-induced luminescence extend the scope of bulk 0D materials and understanding of photophysical properties for optoelectronic applications.

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Держатели документа:
Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing Municipal Key Lab New Energy Mat & Techno, Beijing 100083, Peoples R China.
Anhui Normal Univ, Minist Educ, Key Lab Funct Mol Solids, Anhui Key Lab Optoelect Mat Sci & Technol, Wuhu 241000, Anhui, Peoples R China.
Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116000, Peoples R China.
RAS, Fed Res Ctr KSC SB, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
South China Univ Technol, State Key Lab Luminescent Mat & Devices, Guangzhou 510641, Guangdong, Peoples R China.
South China Univ Technol, Inst Opt Commun Mat, Guangzhou 510641, Guangdong, Peoples R China.

Доп.точки доступа:
Zhou, Jun; Li, Mingze; Ning, Lixin; Zhang, Ruiling; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zhao, Jing; Yang, Songqiu; Han, Keli; Xia, Zhiguo
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    Manipulation of Bi3+/In3+ Transmutation and Mn2+-Doping Effect on the Structure and Optical Properties of Double Perovskite Cs2NaBi1-xInxCl6 / J. Zhou [et al.] // Adv. Opt. Mater. - 2019. - Vol. 7, Is. 8. - Ст. 1801435, DOI 10.1002/adom.201801435. - Cited References: 51. - J.Z. and X.M.R. contributed equally to this work. The present work was supported by the National Natural Science Foundation of China (Grant Nos. 51722202, 51572023, and 91622125) and Natural Science Foundations of Beijing (2172036). X.W.Z. acknowledges the support from National Key R&D Program of China (Grant No. 2016YFB0700700). . - ISSN 2195-1071
   Перевод заглавия: Влияние перестановок Bi3+/In3+ и Mn2+ -допирования на структуру и оптические свойства двойного перовскита Cs2NaBi1-xInxCl6

РУБ Materials Science, Multidisciplinary + Optics
Рубрики:
HALIDE DOUBLE PEROVSKITE
   LEAD-FREE
   ENERGY-TRANSFER
   NANOCRYSTALS
   BR
Кл.слова (ненормированные):
band gap engineering -- halide double perovskites -- Mn2+ doping
Аннотация: The halide double perovskite family represented by A2(B+,B3+)X6 can overcome the lead toxicity and enable generally large band gap engineering via B/B sites' transmutation or exotic dopants to fulfill the emerging applications in the optoelectronic fields. Herein, the design and the experimental synthesis of a new family of Mn2+‐doped Cs2NaBi1‐xInxCl6 crystals with an intense orange‐yellow emission band are reported, and the phase formation stability is discussed via a combined experimental–theoretical approach. Depending on the manipulation of Bi3+/In3+ combination, the band gap increases with In3+ content, and a subsequent evolution from indirect to direct band gap is verified. First‐principles calculations and parity analyses indicate a parity forbidden effect on Cs2NaInCl6, and a combination effect of absorption on Cs2NaBi1‐xInxCl6 from both Cs2NaBiCl6 and Cs2NaInCl6. The associated Mn2+‐doped photoluminescence depending on the Bi3+/In3+ substitution is also addressed from the variation of the different Mn–Cl environment and neighboring‐cation effect.

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Держатели документа:
Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing Municipal Key Lab New Energy Mat & Techno, Beijing 100083, Peoples R China.
Shenzhen Univ, Coll Phys & Optoelect Engn, Shenzhen Key Lab Flexible Memory Mat & Devices, Shenzhen 518060, Peoples R China.
Shenzhen Univ, Coll Optoelect Engn, Minist Educ & Guangdong Prov, Key Lab Optoelect Devices & Syst, Shenzhen 518060, Peoples R China.
KSC SB RAS, Fed Res Ctr, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Dept Engn Phys & Radioelect, Krasnoyarsk 660041, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
South China Univ Technol, State Key Lab Luminescent Mat, Guangzhou 510641, Guangdong, Peoples R China.
South China Univ Technol, Inst Opt Commun Mat, Guangzhou 510641, Guangdong, Peoples R China.

Доп.точки доступа:
Zhou, Jun; Rong, Ximing; Zhang, Peng; Molokeev, M. S.; Молокеев, Максим Сергеевич; Wei, Peijia; Liu, Quanlin; Zhang, Xiuwen; Xia, Zhiguo
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Ferromagnet-antiferromagnet transition in layered perovskites of Sr3YCo4O10.5 type / I. O. Troyanchuk [et al.] // Mater. Res. Express. - 2019. - Vol. 6, Is. 2. - Ст. 026105, DOI 10.1088/2053-1591/aaef21. - Cited References: 30. - This work was supported by the Belarussian Foundation for Basic Research (project F18R-159) and Russian Foundation Basic Research (contract no. 18-52-00020). Yu S Orlov and SG Ovchinnikov are grateful Russian Foundation Basic Research (contracts no. 18-52-00017 Bel_a, 16-02-00507) and Council on grants of the President of the Russian Federation (SP-1844.2016.1) for the support. . - ISSN 2053-1591

РУБ Materials Science, Multidisciplinary
Рубрики:
SPIN
NANOWIRES
Кл.слова (ненормированные):
neutron diffraction -- orbital ordering -- spin state
Аннотация: Sr1−xYxCoO2.65 (x = 0.2) with layered perovskite structure was studied by neutron diffraction, synchrotron x-ray and magnetometry methods. It is shown that in the 90–375 K temperature range the crystal structure can be described by the monoclinic space group A2/m with the superstructure 4√2a p × 2√2a p × 4a p (with a p corresponding to the unit cell parameter of the primitive cell) while basic diffraction peaks are well indexed in the space group I4/mmm (2a p × 2a p × 4a p ) shows an almost standard magnetization. The basic magnetic structure is G-type antiferromagnetic with average magnetic moments of 2.7 μ B/Co and 1.7 μ B/Co in anion-deficient CoO4+γ and stoichiometric CoO6 layers, respectively. A ferromagnetic component of about 0.27 μ B/Co is determined from the magnetization measurements at 8 K. Sr0.8Y0.2CoO2.65 shows an almost standard magnetization versus temperature dependence whereas Sr0.75Y0.25CoO2.65 exhibits an antiferromagnet-ferromagnet transition accompanied by a structural transformation. There is practically no spontaneous magnetization in x = 0.3. The type of the magnetic structure and the high value of TN suggest that the Co3+ ions are in both structural layers predominantly in the low-spin (LS)/high-spin (HS) state mixture. It is proposed that the ferromagnetic component is due to the orbital ordering occurring at TN in the CoO5 pyramids and the concomitant appearance of ferromagnetic coupling between the Co3+(HS) ions located in these CoO5 pyramids in the anion-deficient CoO4+γ layer.

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Держатели документа:
Natl Acad Sci Belarus Mat Sci, Sci & Pract Ctr, Minsk, BELARUS.
Joint Inst Nucl Res, Dubna, Russia.
Inst Laue Langevin, Grenoble, France.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk, Russia.
Siberian Fed Univ, Krasnoyarsk 660074, Russia.

Доп.точки доступа:
Troyanchuk, I. O.; Bushinsky, M. V.; Tereshko, N. V.; Lanovsky, R. A.; Sikolenko, V. V.; Ritter, C.; Orlov, Yu. S.; Орлов, Юрий Сергеевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Belarussian Foundation for Basic Research [F18R-159]; Russian Foundation Basic Research [18-52-00017 Bel_a, 16-02-00507, 18-52-00020]; Council on grants of the President of the Russian Federation [SP-1844.2016.1]
}
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    Thermal expansion and polarization of (1-x)PNN-xPT solid solutions / M. V. Gorev [et al.] // Integr. Ferroelectr. - 2019. - Vol. 196, Is. 1. - P. 60-63, DOI 10.1080/10584587.2019.1591957. - Cited References: 6 . - ISSN 1058-4587. - ISSN 1607-8489
   Перевод заглавия: Тепловое расширение и поляризация твердых растворов (1-x)PNN-xPT

РУБ Engineering, Electrical & Electronic + Physics, Applied + Physics, Condensed Matter
Рубрики:
BEHAVIOR
Кл.слова (ненормированные):
thermal expansion -- polarization -- relaxors -- perovskites
Аннотация: The paper presents the results of detailed studies of the thermal expansion of (1-x)he paper presents the results of detailed studies of the thermal expansion of (1-x)PbNi1/3Nb2/3O3-xPbTiO3 solid solutions with x = 0-0.8. The anomalous and lattice contributions to deformation and the thermal expansion coefficient are analyzed and the mean square polarization Pd is determined. The results obtained are discussed within the framework of the thermodynamic theory and the Landau 2-4-6 coefficients for solid solutions are estimated.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk, Russia.
Siberian Fed Univ, Inst Phys & Radioelect, Krasnoyarsk, Russia.
Univ Latvia, Inst Solid State Phys, LV-1063 Riga, Latvia.

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Bormanis, K.; Kalvane, A.; International Scientific Conference on Functional Materials and Nanotechnologies(12 ; 2018 ; Oct. 02-05 ; Riga, Latvia)
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    Hybrid Metal Halides with Multiple Photoluminescence Centers / M. Z. Li [et al.] // Angew. Chem. Int. Edit. - 2019. - Vol. 58, Is. 51. - P. 18670-18675, DOI 10.1002/anie.201911419. - Cited References: 42. - This work is supported by the National Natural Science Foundation of China (Nos. 51722202 and 51972118), Fundamental Research Funds for the Central Universities (D2190980), the Guangdong Provincial Science & Technology Project (2018A050506004) and by European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (grant agreement No. [819740], project SCALE-HALO). . - ISSN 1433-7851. - ISSN 1521-3773
   Перевод заглавия: Гибридные галогениды металлов с несколькими центрами фотолюминесценции

РУБ Chemistry, Multidisciplinary
Рубрики:
LIGHT EMISSION
PEROVSKITES
BR
Кл.слова (ненормированные):
light-emitting diodes -- manganese -- metal halides -- photoluminescence -- 0D materials
Аннотация: Very little is known about the realm of solid‐state metal halide compounds comprising two or more halometalate anions. Such compounds would be of great interest if their optical and electronic properties could be rationally designed. Herein, we report a new example of metal halide cluster‐assembled compound (C9NH20)9[Pb3Br11](MnBr4)2, featuring distinctly different anionic polyhedra, namely, a rare lead halide cluster [Pb3Br11]5− and [MnBr4]2−. In accordance with its multinary zero‐dimensional (0D) structure, this compound is found to contain two distinct emission centers, 565 nm and 528 nm, resulting from the formation of self‐trapped excitons and 4T1‐6A1 transition of Mn2+ ions, respectively. Based on the high durability of (C9NH20)9[Pb3Br11](MnBr4)2 upon light and heat, as well as high photoluminescence quantum yield (PLQY) of 49.8 % under 450 nm blue light excitation, white light‐emitting diodes (WLEDs) are fabricated, showcasing its potential in backlight application.

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Держатели документа:
Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
South China Univ, State Key Lab Luminescent Mat & Devices, Guangzhou 510641, Guangdong, Peoples R China.
South China Univ, Inst Opt Commun Mat, Guangzhou 510641, Guangdong, Peoples R China.
Swiss Fed Inst Technol, Lab Inorgan Chem, Dept Chem & Appl Biosci, Vladimir Prelog Weg 1, CH-8093 Zurich, Switzerland.
Empa Swiss Fed Labs Mat Sci & Technol, Lab Thin Films & Photovolta, Oberlandstr 129, CH-8600 Dubendorf, Switzerland.

Доп.точки доступа:
Li, Mingze; Zhou, Jun; Zhou, Guojun; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zhao, Jing; Morad, Viktoriia; Kovalenko, Maksym, V; Xia, Zhiguo
}
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    Single-Component White-Light Emission in 2D Hybrid Perovskites with Hybridized Halogen Atoms / G. Zhou [et al.] // Adv. Opt. Mater. - 2019. - Vol. 7, Is. 24. - Ст. 1901335, DOI 10.1002/adom.201901335. - Cited References: 35. - G.J.Z. and M.Z.L. contributed equally to this work. The present work was supported by the National Natural Science Foundations of China (Grant Nos. 51722202 and 51972118), the Fundamental Research Funds for the Central Universities (D2190980), and the Guangdong Provincial Science & Technology Project (No. 2018A050506004). . - ISSN 2195-1071
   Перевод заглавия: Однокомпонентное вещество, излучающее белый свет, из ряда двумерных гибридных перовскитов с гибридизованными атомами галогенов
Кл.слова (ненормированные):
2D halide perovskites -- photoluminescence -- white-light emission
Аннотация: With single-component photoinduced white-light (WL) emission, low-dimensional hybrid halide perovskites have emerged as a new generation of luminescent materials; however, the effect of halogens on the intrinsic light emissions and the corresponding mechanisms is still unknown. Herein, the investigation of a family of two-dimensional (2D) hybrid perovskites R2PbBr4−xClx (R = BA+, PMA+, PEA+; x = 0, 1, 2, 3, 4) highlights the influence of halogens on intrinsic emission to reveal the dependence of the photoluminescence on the nature and contribution of the halogens. Ultrabroad emissions covering the entire visible‐light region are achieved in the halogen hybrid systems with the stoichiometry of R2PbBr2Cl2 (R = BA+, PMA+, PEA+), showing their potential as single‐component WL phosphors in solid‐state lighting devices. The origin of the WL emissions is the synergistic recombination emission of free excitons and self‐trapped excitons. The ratio of halogens (Br/Cl) is confirmed to be a critical factor to fine‐tune the intrinsic emission properties. This work provides a feasible strategy to achieve single‐component WL emission in 2D hybrid perovskites, and proposes a method for regulating halogen contents for optimizing luminescent properties.

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Держатели документа:
The Beijing Municipal Key Laboratory of New Energy Materials and Technologies School of Materials Sciences and Engineering University of Science and Technology Beijing, Beijing 100083, P. R. China
Laboratory of Crystal Physics Kirensky Institute of Physics Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Department of Engineering Physics and Radioelectronics Siberian Federal University, Krasnoyarsk 660041, Russia
Department of Physics Far Eastern State Transport University, Khabarovsk 680021, Russia
State Key Laboratory of Luminescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques South China University of Technology, Guangzhou 510641, P. R. China

Доп.точки доступа:
Zhou, Guojun; Li, Mingze; Zhao, Jing; Molokeev, M. S.; Молокеев, Максим Сергеевич; Xia, Zhiguo
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    Role of Halogen Atoms on High-Efficiency Mn2+ Emission in Two-Dimensional Hybrid Perovskites / G. J. Zhou [et al.] // J. Phys. Chem. Lett. - 2019. - Vol. 10, Is. 16. - P. 4706-4712, DOI 10.1021/acs.jpclett.9b01996. - Cited References: 37. - This work is supported by the National Natural Science Foundation of China (No. 51722202 and 51572023), the Natural Science Foundations of Beijing (2172036), the Fundamental Research Funds for the Central Universities (FRF-TP-18-002C1), and the Guangdong Provincial Science & Technology Project (No. 2018A050506004). . - ISSN 1948-7185
   Перевод заглавия: Роль атомов галогенов в высокоэффективном излучении Mn2 + в двумерном гибридном перовските

РУБ Chemistry, Physical + Nanoscience & Nanotechnology + Materials Science, Multidisciplinary + Physics, Atomic, Molecular & Chemical
Рубрики:
ENERGY-TRANSFER
   LIGHT-EMISSION
   DOPING MN2+
   LEAD-FREE
   NANOCRYSTALS
Аннотация: Doped halide pervoskites as highly efficient light emitters have recently fascinated the research community, while the influence of halogen atoms X (X = Cl, Br, I) on the hybrid energy levels and photoluminescence properties remains a challenge. Here, the role of X compositions in the two-dimensional hybrid perovskite BA2PbX4 (BA = C4H9NH3) on the doped Mn2+ emission is identified, wherein Mn2+ reveals a strong luminescence dependence on the nature of the halogen, and optimum Mn2+ emission with a record quantum yield of 60.1% has been achieved in BA2PbBr4. Density functional theory calculations show that BA2PbBr4 holds low Br vacancy concentration and unique coupled states of the Mn-3d level and Pb-6p level at the conduction band minimum, leading to efficient energy transfer from the host to Mn2+. Our work sheds new light on the methods to realize strong exciton–dopant exchange coupling for achieving high-efficiency dopant luminescence.

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Держатели документа:
Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing Municipal Key Lab New Energy Mat & Techno, Beijing 100083, Peoples R China.
Beihang Univ, Sch Phys, Minist Educ, Key Lab Micronano Measurement Manipulat & Phys, Beijing 100191, Peoples R China.
RAS, Fed Res Ctr KSC SB, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
South China Univ Technol, State Key Lab Luminescent Mat & Devices, Guangzhou 510641, Guangdong, Peoples R China.
South China Univ Technol, Inst Opt Commun Mat, Guangzhou 510641, Guangdong, Peoples R China.

Доп.точки доступа:
Zhou, Guojun; Jia, Xiaofang; Guo, Shaoqiang; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zhang, Junying; Xia, Zhiguo
}
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Zhandun, V. S.
First principles investigation of the magnetic, magnetoelectric, and optical properties of double perovskites containing ions of transition metals LaPbTSbO6 (T = Fe, Co, Ni) / V. S. Zhandun, V. I. Zinenko // J. Exp. Theor. Phys. - 2017. - Vol. 125, Is. 6. - P. 1116-1126, DOI 10.1134/S106377611712010X. - Cited References:22. - This work was supported by the Russian Foundation for Basic Research, project no. 15-02-00340, and by the Government of Krasnoyarsk Krai and Krasnoyarsk Krai Fund for the Support of Research and Development (project no. 16-42-243035). The calculations were carried out on the computing facilities of the National Research Center Kurchatov Institute (ui2.computing.kiae.ru). . - ISSN 1063-7761. - ISSN 1090-6509
Аннотация: Within the first principles approach implemented in the VASP package, a correlation between magnetic, electronic, polarization, and optical properties, on the one hand, and the structural ordering of cations, on the other hand, is investigated in double perovskites LaPbTSbO6 (T = Fe, Co, Ni). Two types of cation ordering are considered: simultaneous layered (LL) and checkerboard (RR) ordering of both cations. These two types of ordering are chosen due to their significance; namely, the ordering RR is one of the most implementable types of cation ordering in double perovskites, and compounds with layered ordering can be considered as a heterostructure consisting of periodically alternating metal-nonmagnetic metal layers, which is of interest for experimental synthesis and investigation. It is found that the type of cation ordering in compounds with T = Fe and Ni radically changes the magnetic and/or electronic properties of the compound. Moreover, it is found that low-symmetry stable phases are polar for both types of cation ordering, and the values of spontaneous polarization are evaluated.

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Публикация на русском языке Жандун, Вячеслав Сергеевич. Исследование ab initio магнитных, магнитоэлектрических и оптических свойств двойных перовскитов, содержащих ионы переходных металлов LaPbTSbO6 (T = Fe, Co, Ni) [Текст] / В. С. Жандун, В. И. Зиненко // Журн. эксперим. и теор. физ. - 2017. - Т. 152 Вып. 6. - С. 1309-1320

Держатели документа:
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Akademgorodok 50-38, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Zinenko, V. I.; Зиненко, Виктор Иванович; Жандун, Вячеслав Сергеевич; Russian Foundation for Basic Research [15-02-00340]; Government of Krasnoyarsk Krai and Krasnoyarsk Krai Fund for the Support of Research and Development [16-42-243035]
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Gavrichkov, V. A.
An impurity resistivity of doped manganese perovskites / V. A. Gavrichkov, S. G. Ovchinnikov // Physica B. - 1999. - Vol. 259-61: International Conference on Strongly Correlated Electron Systems (SCES 98) (JUL 15-18, 1998, PARIS, FRANCE). - P. 828-830, DOI 10.1016/S0921-4526(98)00875-8. - Cited References: 4 . - ISSN 0921-4526

РУБ Physics, Condensed Matter
Рубрики:

Кл.слова (ненормированные):
manganese perovskites -- mobility -- linear and quadratic magnetoresistance
Аннотация: We present a two-time of relaxation approach at an analysis of a magnetoresistance in ferromagnetic manganese perovskites La(1-x)(Ca,Sr)(x)MnO. To explain a change in the low-held response from predominantly quadratic dR/dH\(H-->0) = 0 for T > T(c) to linear dR/dH\(H-->0) for T < T(c) as noted in the measurements in thin films La(0.7)Ca(0.3)MnO(3) we calculated held and temperature dependences of a impurity contribution to a carrier mobility in a framework of the 2p(O)- and 3d(Mn)-scattering model elaborated for manganese perovskites. We obtained the field-dependent impurity contribution to the overall scattering of carriers that show a transition in the low-field (H) dependence of R from quadratic above T(c) to linear below consistent with an experiment. The calculated negative magnetoresistance ratio is sharply peaked at a temperature-near T(c) or below. (C) 1999 Elsevier Science B.V. All rights reserved.

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

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Гавричков, Владимир Александрович
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10.

Comparison of negative magnetoresistance mechanisms in manganese perovskites and chromium spinels / V. A. Gavrichkov [et al.] // Phys. Solid State. - 1999. - Vol. 41, Is. 10. - P. 1652-1655, DOI 10.1134/1.1131064. - Cited References: 17 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
ANISOTROPIC MAGNETORESISTANCE
   TRANSPORT-PROPERTIES
   THIN-FILMS
   ALLOYS
Аннотация: A transition of the field dependence of the electrical resistivity from a square law (similar to H-2) above T-c to a linear function (similar to H) below T-c is observed in the degenerate ferromagnetic semiconductor HgCr2Se4(n). Together with the large negative magnetoresistance, these magnetoelectric effects correspond to effects observed in the perovskite-type oxides La1-xCaxMnOdelta. Inasmuch as the undoped semiconductor HgCr2Se4 is a ferromagnet with approximately the same critical temperature as the doped semiconductor and in view of the total lack of data on the Jahn-Teller effect in this compound, we infer that our results cast doubt on existing hypotheses (polaron and binary exchange) regarding the origin of the giant magnetoresistance in La1-xCaxMnOdelta. Impurity sd scattering is discussed as a possible magnetoresistance mechanism for both compounds. (C) 1999 American Institute of Physics. [S1063-7834(99)01710-4].

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Публикация на русском языке Сравнение механизмов отрицательного магнитосопротивления в марганцевых перовскитах и хромовых шпинелях [Текст] / В. А. Гавричков, Н. Б. Иванова, С. Г. Овчинников [и др.] // Физ. тверд. тела. - Санкт-Петербург, 1999. - Т. 41 Вып. 10. - С. 1800-1803

Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Russian Acad Sci, NS Kurnakov Gen & Inorgan Chem Inst, Moscow 117907, Russia
Krasnoyarsk State Tech Univ, Krasnoyarsk 660074, Russia
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Доп.точки доступа:
Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ivanova, N. B.; Иванова, Наталья Борисовна; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Balaev, A. D.; Балаев, Александр Дмитриевич; Aminov, T. G.; Shabunina, G. G.; Chernov, V. K.; Petukhov, M. V.
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