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HIGH-TEMPERATURE FERROMAGNETISM AND THE METAL-SEMICONDUCTOR TRANSITION IN AN IRON CHROMIUM SULFO-SPINEL / G. A. PETRAKOVSKY [и др.] // Zhurnal Eksperimentalnoi Teor. Fiz. - 1980. - Vol. 79, Is. 6. - P. 2413-2421. - Cited References: 10 . - ISSN 0044-4510

РУБ Physics, Multidisciplinary

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Доп.точки доступа:
Petrakovskiy, G. A.; Петраковский, Герман Антонович; LOSYEVA, G. V.; SOKOLOVICH, V. V.; IKONNIKOV, V. P.; BARANOV, A. V.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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FEDOROV, Y. M.
MAGNETO-OPTICAL PHENOMENA IN RHOMBOHEDRIC ANTIFERROMAGNETS WITH WEAK FERROMAGNETISM / Y. M. FEDOROV, A. A. LEKSIKOV, A. E. AKSENOV // Fiz. Tverd. Tela. - 1984. - Vol. 26, Is. 1. - P. 220-226. - Cited References: 24 . - ISSN 0367-3294

РУБ Physics, Condensed Matter

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Доп.точки доступа:
LEKSIKOV, A. A.; AKSENOV, A. E.
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Goryachev, E. G.
Phase-diagram of a ferromagnetic metal with a narrow nondegenerate band - criterion for ferromagnetism / E. G. Goryachev, E. V. Kuzmin // Phys. Lett. A. - 1989. - Vol. 137, Is. 7-8. - P. 423-426, DOI 10.1016/0375-9601(89)90919-5. - Cited References: 6 . - ISSN 0375-9601

РУБ Physics, Multidisciplinary

WOS
Доп.точки доступа:
Kuzmin, E. V.; Кузьмин, Евгений Всеволодович; Горячев, Евгений Геннадьевич
}
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FEDOSEEVA, N. V.
WEAK FERROMAGNETISM IN ALPHA-KMNCL3 / N. V. FEDOSEEVA, T. A. VELIKANOVA // Fiz. Tverd. Tela. - 1989. - Vol. 31, Is. 2. - P. 224-225. - Cited References: 5 . - ISSN 0367-3294

РУБ Physics, Condensed Matter

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Доп.точки доступа:
VELIKANOVA, T. A.
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Aplesnin, S. S.
Temperature-induced weak ferromagnetism in an anisotropic magnetic with competing interactions / S. S. Aplesnin // Zhurnal Eksperimentalnoi Teor. Fiz. - 1991. - Vol. 99, Is. 1. - P. 189-193. - Cited References: 10 . - ISSN 0044-4510

РУБ Physics, Multidisciplinary
Рубрики:
ANTIFERROMAGNETS
Аннотация: The region of temperature and exchange with a temperature-induced weak ferro magnetic moment in a magnet with competing interactions in the second coordination sphere and with anisotropic distribution of opposite sign bonds possessing a tensor nature in the first sphere is determined by the Monte Carlo method. The temperature dependence of the susceptibility, specific heat and magnetization in an external field is determined.

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Доп.точки доступа:
Аплеснин, Сергей Степанович
}
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Weak ferromagnetism and magnetic-behavior of (CH3NH3)2MNCL4 quasidimetric antiferromagnetic / N. V. Fedoseeva [et al.] // Fiz. Tverd. Tela. - 1994. - Vol. 36, Is. 9. - P. 2609-2617. - Cited References: 8 . - ISSN 0367-3294

РУБ Physics, Condensed Matter

WOS
Доп.точки доступа:
Fedoseeva, N. V.; Aplesnin, S. S.; Аплеснин, Сергей Степанович; Nikolaev, E. M.; Perepelitsa, A. P.
}
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Zenkov, A. A.
Weak ferromagnetism along the 3rd order of FeBo(3) / A. A. Zenkov, V. V. Rudenko, Y. M. Fedorov // Fiz. Tverd. Tela. - 1996. - Vol. 38, Is. 2. - P. 659-663. - Cited References: 15 . - ISSN 0367-3294

РУБ Physics, Condensed Matter

WOS
Доп.точки доступа:
Rudenko, V. V.; Руденко, Валерий Васильевич; Fedorov, Y. M.
}
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Loseva, G. V.
Ferromagnetism and the metal-insulator transition in the magnetic semiconductor system FexMn1-xS / G. V. Loseva, L. I. Ryabinkina, A. D. Balaev // Phys. Solid State. - 1998. - Vol. 40, Is. 2. - P. 250-251, DOI 10.1134/1.1130285. - Cited References: 4 . - ISSN 1063-7834

РУБ Physics, Condensed Matter

Аннотация: The results of investigations of the structure, electrical, and magnetic properties in the system of antiferromagnetic semiconductors FexMn1-xS (0x less than or equal to 0.5) are described. It is established that metal-insulator transitions with respect to concentration and temperature are connected with changes in the magnetic properties of the system. (C) 1998 American Institute of Physics.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Dept, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Ryabinkina, L. I.; Рябинкина, Людмила Ивановна; Balaev, A. D.; Балаев, Александр Дмитриевич
}
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Weak ferromagnetism in copper metaborate CuB2O4 / G. A. Petrakovskii [et al.] // Phys. Solid State. - 1999. - Vol. 41, Is. 7. - P. 1157-1161, DOI 10.1134/1.1130957. - Cited References: 10 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
SUSCEPTIBILITY
Аннотация: CuB2O4 single crystals have been grown and their magnetic and resonance properties have been investigated for the first time. The temperature dependence of the susceptibility was found to contain features at T = 21 and 10 K. The CuB2O4 single crystal transformed at T = 21 K to a weakly ferromagnetic state. The sharp drop in susceptibility at T 10 K is caused by a transition of the magnetic system of CuB2O4 to an antiferromagnetic state. The effective magnetic moment of the Cu2+ ion, determined from the high-temperature part of the magnetic susceptibility, is 1.77 mu(B). The room-temperature g factors are, respectively, 2.170 and 2.133 for magnetic field parallel and perpendicular to the c axis of the crystal. The antiferromagnetic resonance parameters in the weakly ferromagnetic and antiferromagnetic phases were measured. (C) 1999 American Institute of Physics. [S1063-7834(99)02907-X].

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Публикация на русском языке Слабый ферромагнетизм в метаборате меди CuB2O4 [Текст] / Г. А. Петраковский, К. А. Саблина, Д. А. Великанов [и др.] // Физ. тверд. тела. - 1999. - Т. 41 Вып. 7. - С. 1267-1271

Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
L. V. Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Petrakovskii, G. A.; Петраковский, Герман Антонович; Sablina, K. A.; Саблина, Клара Александровна; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Vorotynov, A. M.; Воротынов, Александр Михайлович; Volkov, N. V.; Волков, Никита Валентинович; Bovina, A. F.; Бовина, Ася Федоровна
}
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10.

Microscopic model of the coexistence of superconductivity and ferromagnetism in the hybrid ruthenate-cuprate oxide RuSr2GdCu2O8 / E. V. Kuz'min [et al.] // J. Exp. Theor. Phys. - 2000. - Vol. 91, Is. 2. - P. 353-360, DOI 10.1134/1.1311995. - Cited References: 37 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
T-J MODEL
   HUBBARD-MODEL
   LAYERED PEROVSKITE
   SR2RUO4
   ELECTRONS
   COPPER
   SPECTRUM
Аннотация: A microscopic t-J-I model with competing antiferromagnetic (J) and ferromagnetic (I) exchange interactions is proposed for strongly correlated electrons in RuSr2GdCu2O8 . It is assumed that J much greater than I for CuO2 layers and J much less than I for RuO2 layers. A superconducting solution of d(x2-y2) symmetry was obtained for the CuO2 layers while competition between ferromagnetism and p-type triplet superconducting pairing is obtained for RuO2 layers. It is shown that the RuO2 layers have a lower carrier concentration in the Hubbard subband formed by coupled ((d(xy)-p)-pi) orbitals compared with a bulk Sr2RuO4 crystal, which leads to stabilization of the ferromagnetic state in the RuO2 layer. (C) 2000 MAIK "Nauka/Interperiodica".

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Публикация на русском языке Микроскопическая модель сосуществования сверхпроводимости и ферромагнетизма в гибридном рутенатно-купратном оксиде RuSr2GdCu2O8 [Текст] / Е. В. Кузьмин [и др.] // Журн. эксперим. и теор. физ. - 2000. - Т. 118 Вып. 2.- С.404

Держатели документа:
Krasnoyarsk State Univ, Krasnoyarsk 660062, Russia
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Kuz'min, E. V.; Кузьмин, Евгений Всеволодович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Baklanov, I. O.; Бакланов И. О.; Goryachev, E. G.; Горячев, Евгений Геннадьевич
}
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11.

Synthesis of the new oxocuprate Cu5Bi2B4O14 and investigation of its structural, magnetic, and resonant properties / G. A. Petrakovskii [et al.] // Phys. Solid State. - 2002. - Vol. 44, Is. 7. - P. 1339-1344, DOI 10.1134/1.1494633. - Cited References: 16 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
CUB2O4 COPPER METABORATE
FERROMAGNETISM
Аннотация: Single crystals of the new compound Cu5Bi2B4O14 are grown and its structural, magnetic, and resonant properties are investigated for the first time. It is found that the Cu5Bi2B4O14 crystal synthesized has a triclinic symmetry with space group P (1) over bar and the unit cell parameters a = 10.132 Angstrom, b = 9.385 Angstrom, c = 3.458 Angstrom, alpha = 105.443degrees, beta = 97.405degrees, gamma = 107.784degrees, and Z = 1. At a temperature of 24.5 K, the crystal undergoes a magnetic phase transition to the magnetically ordered state. The assumption is made that the ferrimagnetic structure of the Cu5Bi2B4O14 crystal consists of two ferromagnetic sublattices coupled through the antiferromagnetic exchange interaction. The unit cell of the crystal contains five copper ions, of which one ion belongs to the first sublattice and the other four ions form the second sublattice. Analysis of the resonant and magnetic static properties demonstrates that the Cu5Bi2B4O14 crystal exhibits an easy-axis magnetic anisotropy. The direction of the easy axis coincides with the c axis of the crystal, whereas the a and b axes are the hard magnetic axes with saturation fields approximately equal to 25 and 10 kOe, respectively. (C) 2002 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Organ Chem, Siberian Div, Novosibirsk 630090, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Petrakovskii, G. A.; Петраковский, Герман Антонович; Sablina, K. A.; Саблина, Клара Александровна; Pankrats, A. I.; Панкрац, Анатолий Иванович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Balaev, A. D.; Балаев, Александр Дмитриевич; Bayukov, O. A.; Баюков, Олег Артемьевич; Tugarinov, V. I.; Тугаринов, Василий Иванович; Vorotynov, A. M.; Воротынов, Александр Михайлович; Vasil'ev, A. D.; Васильев, Александр Дмитриевич; Romanenko, G. V.; Shvedenkov, Y. G.
}
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12.

Kuz'min, E. V.
Effect of frustrations on magnetism in the Ru double perovskite Sr2YRuO6 / E. V. Kuz'min, S. G. Ovchinnikov, D. J. Singh // Phys. Rev. B. - 2003. - Vol. 68, Is. 2. - Ст. 24409, DOI 10.1103/PhysRevB.68.024409. - Cited References: 24 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
MOTT TRANSITION
   LATTICE
   SPIN
   ANTIFERROMAGNETISM
   SUPERCONDUCTIVITY
   FERROMAGNETISM
Аннотация: Localized Ru5+ spins in Sr2YRuO6 form a fcc lattice with an antiferromagnetic (AFM) nearest-neighbor (NN) coupling J approximate to 25 meV and rather low Neel temperature T-N= 26 K. Analysis of the electronic structure of Sr2RuO4 results in the effective Heisenberg model. We have studied the effect of frustrations on the AFM type-I structure of Sr2YRuO6 in the spin-wave approximation. In the model with only NN coupling the AFM state is unstable due to frustrations, and T-N = 0. Stabilization of the AFM state occurs due to the next-nearest-neighbor coupling I or due to the magnetic anisotropy D. Very small values D/J similar to I/J less than or equal to 10(-3) are enough to obtain the experimental values of T-N and sublattice magnetization m = 1.85 mu(B) /Ru (62% from the nominal S = 3/2 value).

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Держатели документа:
Krasnoyarsk State Univ, Krasnoyarsk 660074, Russia
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
USN, Res Lab, Ctr Computat Mat Sci, Washington, DC 20375 USA
ИФ СО РАН

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Singh, D. J.
}
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13.

Ovchinnikov, S. G.
Many-electron model of band structure and metal-insulator transition under pressure in FeBO3 / S. G. Ovchinnikov // JETP Letters. - 2003. - Vol. 77, Is. 12. - P. 676-679, DOI 10.1134/1.1604419. - Cited References: 20 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
PHASE-TRANSITION
FERROMAGNETISM
STATE
Аннотация: A many-electron model is proposed for the band structure of FeBO3 with regard to strong electron correlations in the d (4), d (5), and d (6) configurations. Under normal conditions, FeBO3 is characterized by a dielectric charge-transfer gap in the strong correlation regime U W. With increasing pressure, not only does the d-band W width grow but simultaneously the effective Hubbard parameter U-eff sharply drops, which is due to the crossover of high-spin and low-spin ground state terms of the Fe2+, Fe3+, and Fe4+ ions. It is predicted that a transition from the semiconducting antiferromagnetic state to the metallic paramagnetic state will occur in the high-pressure phase with increasing temperature. (C) 2003 MAIK "Nauka / Interperiodica".

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

Доп.точки доступа:
Овчинников, Сергей Геннадьевич
}
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14.

Ovchinnikov, S. G.
The energy band structure and optical spectra of FeBO3 calculated with allowance for strong electron correlations / S. G. Ovchinnikov, V. N. Zabluda // J. Exp. Theor. Phys. - 2004. - Vol. 98, Is. 1. - P. 135-143, DOI 10.1134/1.1648107. - Cited References: 32. - This study was supported by the Russian Foundation for Basic Research (project no. 03-02-16286) and by the “Strongly Correlated Electrons” Program of the Department of Physical Sciences of the Russian Academy of Sciences . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
PHASE-TRANSITION
   HIGH-PRESSURE
   FERROMAGNETISM
   MODEL
Кл.слова (ненормированные):
Atomic physics -- Band structure -- Charge transfer -- Excitons -- Green's function -- Light absorption -- Dielectric gap -- Energy band structure -- Lehmann spectral representation -- Optical spectra -- Iron compounds
Аннотация: A model of the energy band structure of iron borate (FeBO3) is proposed that combines a one-electron description of the sp states of boron and oxygen with a many-electron description of the d states of iron. The Green functions of d electrons are calculated using the exact Lehmann spectral representation. The energies of the d-type quasiparticles are calculated using terms of the d(4) , d(5) , and d(6) electron configurations. The optical absorption spectrum of FeBO3 is determined by local excitons and by the electron excitations with charge transfer. The latter excitations control the nature of the dielectric gap in FeBO3 crystals. The model parameters are determined from a comparison to the exciton energies. The density of single-particle states in FeBO3 is calculated. The main bands in the calculated optical absorption spectrum agree well with experimental data for energies up to 3 eV. (C) 2004 MAIK "Nauka/Interperiodica".

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Публикация на русском языке Овчинников, Сергей Геннадьевич. Энергетическая структура и оптические спектры FeBO[3] с учетом сильных электронных корреляций [Текст] / С. Г. Овчинников, В. Н. Заблуда // Журн. эксперим. и теор. физ. - 2004. - Т. 125 Вып. 1. - С. 150-159

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

Доп.точки доступа:
Zabluda, V. N.; Заблуда, Владимир Николаевич; Овчинников, Сергей Геннадьевич
}
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15.

Martynov, S. N.
Transition between incommensurate phases accompanied by reversal of the magnetic structure vector in CuB2O4 / S. N. Martynov // Phys. Solid State. - 2005. - Vol. 47, Is. 4. - P. 678-683, DOI 10.1134/1.1913980. - Cited References: 17 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
COPPER METABORATE CUB2O4
WEAK FERROMAGNETISM
10 K
Аннотация: The incommensurate magnetic state of copper metaborate CuB2O4 is studied in the temperature range 2 T 12 K. Competition between frustrated and non-frustrated antisymmetric exchange interactions is shown to cause the magnetic structure vector to reverse at T

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

Доп.точки доступа:
Мартынов, Сергей Николаевич
}
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16.

Conductivity, weak ferromagnetism, and charge instability in an alpha-MnS single crystal / S. S. Aplesnin [et al.] // Phys. Rev. B. - 2005. - Vol. 71, Is. 12. - Ст. 125204 ; Phys. Rev. B Condens. Matter Mater. Phys. - 2005. - Vol. 71, Is. 12. - Ст. 125204, DOI 10.1103/PhysRevB.71.125204. - Cited References: 11 . - ISSN 1098-0121. - Вариант Sopus

РУБ Physics, Condensed Matter
Рубрики:
MANGANITES
Кл.слова (ненормированные):
ferromagnetic material -- manganese derivative -- absorption spectroscopy -- article -- calculation -- conductance -- crystal -- electron spin resonance -- hybridization -- magnetic field -- magnetism -- measurement -- molecular interaction -- temperature dependence -- temperature measurement -- ferromagnetic material -- manganese derivative -- absorption spectroscopy -- article -- calculation -- conductance -- crystal -- electron spin resonance -- hybridization -- magnetic field -- magnetism -- measurement -- molecular interaction -- temperature dependence -- temperature measurement
Аннотация: The temperature dependence of resistivity, magnetization, and electron-spin resonance of the α-MnS single crystal were measured in temperature range of 5 K < T< 550 K. Magnetization hysteresis in an applied magnetic field up to 0.7 T at T=5, 77, and 300 K, irreversible temperature behavior of magnetization, and resistivity were found. The obtained data were explained in terms of a degenerate tight binding model using random phase. approximation. The contribution of holes in t(2g) and e(g) bands of manganese ions to the conductivity, optical absorbtion spectra, and charge instability in α-MnS were studied. Charge susceptibility maxima resulted from the competition of the on-site Coulomb interaction between the holes in different orbitals and small hybridization of subbands were calculated at T = 160, 250, and 475 K.

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Держатели документа:
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
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Aplesnin, S. S.; Аплеснин, Сергей Степанович; Ryabinkina, L. I.; Рябинкина, Людмила Ивановна; Abramova, G. M.; Абрамова, Галина Михайловна; Romanova, O. B.; Романова, Оксана Борисовна; Vorotynov, A. M.; Воротынов, Александр Михайлович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Kiselev, N. I.; Balaev, A. D.; Балаев, Александр Дмитриевич

}
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17.

Aplesnin, S. S.
Anomalies in magnetoresistance and in the bulk modulus for ferromagnetics with four-spin exchange interaction on the Kondo lattice / S. S. Aplesnin, N. I. Piskunova // J. Phys.: Condens. Matter. - 2006. - Vol. 18, Is. 29. - P. 6859-6868, DOI 10.1088/0953-8984/18/29/023. - Cited References: 29 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
MIXED-VALENCE MANGANITES
   PHASE-SEPARATION
   LA1-XSRXMNO3
   BEHAVIOR
   PECULIARITIES
   TRANSITION
Кл.слова (ненормированные):
Elastic moduli -- Electric resistance -- Ferromagnetism -- Function evaluation -- Paramagnetism -- Transceivers -- Adiabatic approximation -- Kondo lattice -- Paramagnetic state -- Ring exchange -- Magnetoresistance
Аннотация: The temperature dependence of resistivity and the bulk modulus are calculated on the Kondo lattice, with ring exchange between localized spins, using the spin-polaron and adiabatic approximation. Peak and zero values of the bulk modulus as functions of temperature and concentration are determined below the temperature of the transition to the paramagnetic state. The effects of the nearest order between transverse spin components and a value of the ring exchange between localized spins on magnetoresistivity are estimated.

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
MF Reshetneva Aircosm Siberian State Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
L v Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
M F Reshetneva Aircosmic Siberian State University, Krasnoyarsk, 660014, Russian Federation

Доп.точки доступа:
Piskunova, N. I.; Аплеснин, Сергей Степанович
}
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18.

Abramova, G. M.
Metal-insulator transition, magnetoresistance, and magnetic properties of 3d-sulfides (Review) / G. M. Abramova, G. A. Petrakovskii // Low Temp. Phys. - 2006. - Vol. 32, Is. 8-9. - P. 725-734 ; Физика низких температур, DOI 10.1063/1.2219495. - Cited References: 74 . - ISSN 1063-777X

РУБ Physics, Applied
Рубрики:
GIANT-MAGNETORESISTANCE
   PHASE-TRANSITION
   ALPHA-MNS
   COLOSSAL MAGNETORESISTANCE
   SINGLE-CRYSTALS
   FES-MNS
   SULFIDES
   FERROMAGNETISM
   SEMICONDUCTORS
   TEMPERATURE
Аннотация: The results of a study of the transport and magnetic properties of some sulfides of 3d elements are reported. The concentration transitions with a change of conductivity type and a change of magnetic order are considered, and the features of the colossal magnetoresistance in FexMn1-xS and CuVxCr1-xS2 solid solutions are discussed.

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

Доп.точки доступа:
Petrakovskii, G. A.; Петраковский, Герман Антонович; Абрамова, Галина Михайловна

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19.

Magnetic, structural, and dielectric properties of CuB(2)O(4) / G. . Nenert [et al.] // Phys. Rev. B. - 2007. - Vol. 76, Is. 14. - Ст. 144401, DOI 10.1103/PhysRevB.76.144401. - Cited References: 30 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
WEAK FERROMAGNETISM
   COPPER METABORATE
   MAGNETOELECTRIC PHENOMENA
   BAMNF4
   CR2O3
   ANTIFERROMAGNETICS
   CONSTANT
Аннотация: We have studied the magnetic, structural, and dielectric properties of a single crystal of CuB(2)O(4). We show that both reported magnetic transitions are observable in the magnetization, irrespective of the measured direction of the crystal. This is in agreement with recent neutron data. More importantly, our study demonstrates the absence of dielectric anomalies at the various magnetic transitions despite the reported magnetoelectric symmetry. This demonstrates that the polarization remains zero at any temperature. Consequently, we interpret our data as the evidence for a very weak or the absence of linear magnetoelectric coupling in this material.

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Держатели документа:
[Nenert, G.
Palstra, T. T. M.] Univ Groningen, Zernike Inst Adv Mat, Solid State Chem Lab, NL-9747 AG Groningen, Netherlands
[Bezmaternykh, L. N.] LV Kirenskii Inst Phys, Siberian Branch RAS, Krasnoyarsk 660036, Russia
[Vasiliev, A. N.] Moscow MV Lomonosov State Univ, Loe Temp Phys Dept, Moscow 119991, Russia
ИФ СО РАН
Solid State Chemistry Laboratory, Zernike Institute for Advanced Materials, University of Groningen, Nijenborg 4, 9747 AG Groningen, Netherlands
L. V. Kirensky Institute of Physics, Siberian Branch of RAS, Krasnoyarsk 660036, Russian Federation
Low Temperature Physics Department, Moscow State University, Moscow 119991, Russian Federation
CEA-Grenoble DRFMC/SPSMS/MDN, 17 rue des Martyrs, 38054 Grenoble Cedex, France

Доп.точки доступа:
Nenert, G.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Vasiliev, A. N.; Palstra, TTM
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20.

Itinerant in-plane magnetic fluctuations and many-body correlations in NaxCoO2 / M. M. Korshunov [et al.] // Phys. Rev. B. - 2007. - Vol. 75, Is. 9. - Ст. 94511, DOI 10.1103/PhysRevB.75.094511. - Cited References: 47 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
TRANSITION-METALS
   WAVE-FUNCTIONS
   HUBBARD-MODEL
   FERMI-SURFACE
   ENERGY-BANDS
   FERROMAGNETISM
   APPROXIMATION
   DIMENSIONS
   SYSTEMS
   FIELD
Аннотация: Based on the ab initio band structure for NaxCoO2, we derive the single-electron energies and the effective tight-binding description for the t(2g) bands using projection procedure. Due to the presence of the next-nearest-neighbor hoppings, a local minimum in the electronic dispersion close to the Gamma point of the first Brillouin zone forms. Correspondingly, in addition to a large Fermi surface, an electron pocket close to the Gamma point emerges at high doping concentrations. The latter yields a scattering channel, resulting in a peak structure of the itinerant magnetic susceptibility at small momenta. This indicates dominant itinerant in-plane ferromagnetic fluctuations above a certain critical concentration x(m), in agreement with neutron scattering data. Below x(m), the magnetic susceptibility shows a tendency toward the antiferromagnetic fluctuations. We further analyze the many-body effects on the electronic and magnetic excitations using various approximations applicable for different U/t ratios.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
Tech Univ Braunschweig, Inst Math & Theoret Phys, D-38106 Braunschweig, Germany
Russian Acad Sci, Ural Div, Inst Met Phys, Yetaterinburg 620041, Russia
ИФ СО РАН
L. V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
Max-Planck-Institut fur Physik Komplexer Systeme, D-01187 Dresden, Germany
Institute fur Mathematische und Theoretische Physik, TU Braunschweig, 38106 Braunschweig, Germany
Institute of Metal Physics, Russian Academy of Sciences, Ural Division, 620041 Yekaterinburg GSP-170, Russian Federation

Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Eremin, I.; Shorikov, A.; Anisimov, V. I.; Renner, M.; Brenig, W.
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