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Общее количество найденных документов : 135
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1.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pparshin A. S., Chistyakov N. S.
Заглавие : Spin-wave resonance in thin monocrystalline iron-manganese ferrite films
Место публикации : Phys. Status Solidi B. - 1982. - Vol. 112, Is. 2. - P.K89-K92. - ISSN 0370-1972, DOI 10.1002/pssb.2221120249
Примечания : Cited References: 7
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2.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parshin A. S., Chistyakov N. S.
Заглавие : Effect of a magnetization inhomogeneity on spin-wave resonance-spectra of monocrystalline films of iron-manganese spinel
Место публикации : Izv. Vysshikh Uchebnykh Zavedenii Fizika. - 1983. - Vol. 26, Is. 11. - P.26-29. - ISSN 0021-3411; \b Russian Physics Journal; \b Известия высших учебных заведений. Физика
Примечания : Cited References: 10
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3.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popov E. A., Kotlyarskii M. M., Edelman I. S.
Заглавие : Temperature and field dependence of exciton-magnon absorption of NaMnCl//3.
Место публикации : Physica Status Solidi B - Basic Research. - 1985. - Vol. 132, Is. 2. - P.465-470. - ISSN 0370-1972
Ключевые слова (''Своб.индексиров.''): band structure--light - absorption--sodium compounds - optical properties--exciton-magnon absorption--sodium manganese chloride--magnetic materials
Аннотация: The behaviour of the optical absorption bands of NaMnCl//3 is experimentally studied in the region of the **6A//1//g to **4A//1//g, **4E//g(**4G) transition of the Mn**2** plus ion in the temperature range 1. 8 to 20 K and in magnetic fields up to 20 T. Exciton and its 'hot' magnon sidebands are observed in the spectrum. The anomalous temperature dependence of the exciton-magnon bands intensity is explained by participation of magnons with wave vector K does not equal 0 in absorption. The low energy exciton-magnon band is supposed to be due to simultaneous creation of an exciton and annihilation of three thermally created magnons.
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4.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavrichkov V. A., Ivanova N. B., Ovchinnikov S. G., Balaev A. D., Aminov T. G., Shabunina G. G., Chernov V. K., Petukhov M. V.
Заглавие : Comparison of negative magnetoresistance mechanisms in manganese perovskites and chromium spinels
Место публикации : Phys. Solid State: AMER INST PHYSICS, 1999. - Vol. 41, Is. 10. - P1652-1655. - ISSN 1063-7834, DOI 10.1134/1.1131064
Примечания : Cited References: 17
Предметные 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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5.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavrichkov V. A., Ovchinnikov S. G.
Заглавие : An impurity resistivity of doped manganese perovskites
Место публикации : Physica B: ELSEVIER SCIENCE BV, 1999. - Vol. 259-61: International Conference on Strongly Correlated Electron Systems (SCES 98) (JUL 15-18, 1998, PARIS, FRANCE). - P828-830. - ISSN 0921-4526, DOI 10.1016/S0921-4526(98)00875-8
Примечания : Cited References: 4
Предметные рубрики:
Ключевые слова (''Своб.индексиров.''): 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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6.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Loseva G. V., Ovchinnikov S. G., Balaev A. D., Kiselev N. I.
Заглавие : Metal-dielectric transitions, magnetism, and electronic structure in a system of manganese-doped vanadium sulfides
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2000. - Vol. 42, Is. 3. - P539-543. - ISSN 1063-7834, DOI 10.1134/1.1131245
Примечания : Cited References: 12
Предметные рубрики: TRANSPORT
Аннотация: The effect of the manganese doping of vanadium monosulfide in a system of the V1-xMnxS (0 x less than or equal to 0.3) solid solutions on their structure and thermal, electrical, and magnetic properties has been investigated. The metal-dielectric transitions are revealed in the studied ranges of concentrations and temperatures. These transitions are accompanied by a change in the magnetic properties. It is demonstrated that the correlation in changes of the electrical and magnetic properties of the sulfides under investigation is characteristic of the metal-dielectric transitions in strongly correlated systems. (C) 2000 MAIK "Nauka/Interperiodica".
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7.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrakovskii G. A., Ryabinkina L. I., Abramova G. M., Velikanov D. A., Bovina A. F.
Заглавие : Antiferromagnet-ferromagnet transition in alpha-MnxS manganese sulfides
Разночтения заглавия :авие SCOPUS: Antiferromagnet-ferromagnet transition in α-MnxS manganese sulfides; авие SCOPUS: Antiferromagnet-ferromagnet transition in ?-MnxS manganese sulfides
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2001. - Vol. 43, Is. 3. - P493-495. - ISSN 1063-7834, DOI 10.1134/1.1356126; Phys. Solid State. - 2001. - Vol. 43, Is. 3. - P493-495. - Вариант Sopus
Примечания : Cited References: 7
Аннотация: Off-stoichiometric manganese monosulfides alpha -MnxS (1 less than or equal to x less than or equal to 1.25) are synthesized, and their crystal structure and magnetic properties are studied in the 4.2- to 300-K range. The compounds have a NaCl fcc lattice. Increasing the manganese ion concentration x in the antiferromagnetic semiconductors alpha -MnxS is found to result in concentration- (x(c) similar to 1.05) and temperature-driven (T-c similar to 50 K) magnetic transitions from the antiferromagnetic to ferromagnetic state, with the cubic structure remaining unchanged. (C) 2001 MAIK "Nauka/Interperiodica".
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8.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Petrakovskii G. A., Ryabinkina L. I., Abramova G. M., Kiselev N. I., Romanova O. B.
Заглавие : Influence of magnetic ordering on the resistivity anisotropy of alpha-MnS single crystal
Разночтения заглавия :авие SCOPUS: Influence of magnetic ordering on the resistivity anisotropy of α-MnS single crystal; авие SCOPUS: Influence of magnetic ordering on the resistivity anisotropy of ?-MnS single crystal
Место публикации : Solid State Commun.: PERGAMON-ELSEVIER SCIENCE LTD, 2004. - Vol. 129, Is. 3. - P195-197. - ISSN 0038-1098, DOI 10.1016/j.ssc.2003.09.028; Solid State Commun. - 2004. - Vol. 129, Is. 3. - P195-197. - Вариант Sopus
Примечания : Cited References: 7
Ключевые слова (''Своб.индексиров.''): anisotropy of resistivity--optical gap--d. anisotropy of resistivity--d. optical gap--antiferromagnetism--band structure--bandwidth--diffractometers--electron transitions--fermi level--hamiltonians--light absorption--magnetic anisotropy--magnetization--single crystals--spectroscopic analysis--x ray diffraction analysis--coulomb repulsion--resistivity anisotropy--semiconducting manganese compounds--d. anisotropy of resistivity--d. optical gap--antiferromagnetism--band structure--bandwidth--diffractometers--electron transitions--fermi level--hamiltonians--light absorption--magnetic anisotropy--magnetization--single crystals--spectroscopic analysis--x ray diffraction analysis--coulomb repulsion--resistivity anisotropy--semiconducting manganese compounds
Аннотация: The resistivity and the optical absorbtion spectra of single crystal alpha-MnS are studied in the temperature range 80-300 K along two directions [100] and [111]. Strong anisotropy of the resistivity, and the shift of absorbtion spectra band edge below T 160 K are explained in terms of model involving delocalized holes in 3d-band manganese ions interacting with localized spins by using the sd-model. (C) 2003 Elsevier Ltd. All rights reserved.
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9.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Piskunova N. I.
Заглавие : Influence of the four-spin exchange interaction on the magnetic properties of manganites
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2005. - Vol. 17, Is. 37. - P.5881-5888. - ISSN 0953-8984, DOI 10.1088/0953-8984/17/37/023
Примечания : Cited References: 18
Предметные рубрики: METAL-INSULATOR-TRANSITION
PHASE
SUSCEPTIBILITY
LA1-XSRXMNO3
FERROMAGNET
TRANSPORT
Ключевые слова (''Своб.индексиров.''): computer simulation--ion exchange--lanthanum compounds--magnetic properties--monte carlo methods--phase diagrams--phase transitions--four-spin exchange interaction--magnetic phase diagram--manganites--metal-dielectric transition--manganese compounds
Аннотация: It is shown that non-Heisenberg exchange interaction should be taken into account to reproduce the magnetic phase diagram of La(1-x)A(x)MnO(3) (A = Ca, Sr) using only effective exchange parameters and spins. The formation of the four-spin exchange arises from carrier hopping and coincides with the critical concentration metal-dielectric transition. The two- and four-spin exchange parameters are determined by Monte Carlo simulations.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vasilyeva I. G., Dovlitova L. S., Zaikovskii V. I., Malakhov V. V., Edel'man I. S., Stepanov A. S., Aleksandrov K. S.
Заглавие : Actual composition and structure of manganese ferrite nanoparticles dispersed in the borate glass matrix
Место публикации : Doklady Chemistry. - 2005. - Vol. 401, Is. 1-3. - P.47-50. - ISSN 0012-5008, DOI 10.1007/s10631-005-0029-y
Ключевые слова (''Своб.индексиров.''): boric acid--ferrite--glass--manganese derivative--analytic method--article--chemical composition--chemical structure--nanoparticle--stoichiometry--structure analysis--transmission electron microscopy--x ray analysis
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