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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volkov N. V., Petrakovskii G. A., Vasiliev V. N., Velikanov D. A., Sablina K. A., Patrin K. G.
Заглавие : Observation of mixed two-phase state in Eu0.7Pb0.3MnO3 single crystal by magnetic resonance method
Место публикации : Physica B. - 2002. - Vol. 324, Is. 1-4. - P.254-260. - ISSN 0921-4526, DOI 10.1016/S0921-4526(02)01397-2
Примечания : Cited References: 19
Предметные рубрики: OPTIMALLY DOPED MANGANITES
COLOSSAL MAGNETORESISTANCE
PARAMAGNETIC ANOMALIES
CURIE-TEMPERATURE
LA1-XCAXMNO3
RELAXATION
SEPARATION
Ключевые слова (''Своб.индексиров.''): manganites--cmr--magnetic resonance--phase separation--cmr--magnetic resonance--manganites--phase separation--europium compounds--ferromagnetic materials--paramagnetic resonance--phase separation--phase transitions--manganites--single crystals
Аннотация: The magnetic resonance measurements show that the mixed two-phase state takes place in the Eu0.7Pb0.3MnO3 single crystal. The coexistence of the magnetic phases is observed in vicinity of the magnetic phase transition, where the sample exhibits the effect of the CMR. The frequency-field dependencies of the spectra allow to conclude that these phases are paramagnetic and ferromagnetic ones. Moreover, the study of the frequency dependencies shows the sensitivity of the mixed-phase state to the external magnetic field. This suggests that the scenario of the phase separation is realized in this case and the mixed two-phase state is not related to simple chemical inhomogeneity. (C) 2002 Elsevier Science B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volkov N. V., Petrakovskii G. A., Vasil'ev V. N., Sablina K. A.
Заглавие : Two-phase paramagnetic-ferromagnetic state of La0.7Pb0.3MnO3 single-crystal lanthanum manganite
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2002. - Vol. 44, Is. 7. - P1350-1354. - ISSN 1063-7834, DOI 10.1134/1.1494635
Примечания : Cited References: 17
Предметные рубрики: COLOSSAL MAGNETORESISTANCE
MAGNETIC-RESONANCE
DOPED MANGANITES
LA1-XCAXMNO3
SEPARATION
TRANSITION
RELAXATION
EPR
Аннотация: Two phases, paramagnetic and ferromagnetic, were shown by the magnetic resonance method to coexist below the temperature T-C in La0.7Pb0.3MnO3 single crystals exhibiting colossal magnetoresistance. The magnetic resonance spectra were studied in the frequency range 10-78 GHz. The specific features in the behavior of the spectral parameters were observed to be the strongest at the temperatures corresponding to the maximum magnetoresistance in the crystals. The concentration ratios of the paramagnetic and ferromagnetic phases in the samples were found to be sensitive to variations in temperature and external magnetic field. This behavior suggests realization of the electronic phase separation mechanism in the system under study. (C) 2002 MAIK "Nauka/Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrakovskii G. A., Volkov N. V., Vasil'ev V. N., Sablina K. A.
Заглавие : Magnetic resonance spectrum of a two-phase state in single crystals of La0.7Pb0.3MnO3 lanthanum manganite
Место публикации : JETP Letters. - 2000. - Vol. 71, Is. 4. - P.144-147. - ISSN 0021-3640, DOI 10.1134/1.568300
Примечания : Cited References: 10
Предметные рубрики: FERROMAGNETIC-RESONANCE
LA1-XCAXMNO3
SEPARATION
Аннотация: Two absorption lines are observed over a wide temperature range below T-c in the magnetic resonance spectrum of an La0.7Pb0.3MnO3 single crystal. These lines correspond to two magnetic phases in the sample. The frequency-field dependence of spectra obtained in the range of microwave radiation frequencies 10-77 GHz allows these phases to be interpreted as ferromagnetic and paramagnetic phases. The phase volume ratio depends on the temperature and the magnitude of the external magnetic field. Features in the temperature behavior of parameters of the magnetic absorption line are observed in the region of the highest magnetic resistance of the sample. The results are interpreted within the mechanism of electronic phase separation. (C) 2000 MAIK "Nauka/Interperiodica".
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