The evolution of the optical spectra of LaMnO3 under light n- and p-type doping and the separation of phases / Loshkareva NN,Sukhorukov YP,Mostovshchikova EV,Nomerovannaya LV,Makhnev AA,Naumov SV,Gan'shina EA,Rodin IK,Moskvin AS,Balbashov AM // JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS. - 2002. - V. 94, l. 2. - P. 350-355.

ISSN/EISSN:

1063-7761 / нет данных

Type:

Article

Abstract:

The optical absorption spectra of LaMnO3 single crystals, pure and slightly doped with Ce and Sr (7\%), were studied in the middle IR region. Ellipsometry measurements were performed in the visible region to determine real and imaginary permittivity parts. The energies of the onset of indirect transitions in LaMnO3 at 293 and 80 K were found to be 0.30 and 0.40 eV, respectively. Impurity absorption bands corresponding to transition in hole and electron clusters were observed. The anomalous temperature dependence of IR absorption was explained by the existence of conducting droplets in the insulated doped crystal matrices at temperatures below the temperature of the appearance of a ferromagnetic contribution. The existence of such a contribution was proved by studying the equatorial Kerr effect. Because of the separation of phases, manganites slightly doped by a nonisovalent admixture can be treated as optically nonuniform media whose properties are similar to those of a composite system with metallic inclusions. (C) 2002 MAIK ``Nauka / Interperiodica{''}.

Author keywords:

MANGANITES; ABSORPTION; LA1-XSRXMNO3; CENTERS

DOI:

10.1134/1.1458485

Web of Science ID:

ISI:000174229600017

Соавторы в МНС:

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Другие поля

Поле	Значение
Publisher	AMER INST PHYSICS
Address	CIRCULATION \& FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA
Language	English
Keywords-Plus	MANGANITES; ABSORPTION; LA1-XSRXMNO3; CENTERS
Research-Areas	Physics
Web-of-Science-Categories	Physics, Multidisciplinary
ResearcherID-Numbers	Loshkareva, Natalia/K-1587-2013 Makhnev, Alexander/J-4842-2013 Naumov, Sergey/J-8492-2013 Mostovshchikova, Elena/J-3623-2013 Nomerovannaya, Larisa/J-5601-2013 Sukhorukov, Yuri/J-3588-2013
ORCID-Numbers	Loshkareva, Natalia/0000-0002-1701-8712 Makhnev, Alexander/0000-0003-2868-6713 Naumov, Sergey/0000-0003-4527-6396 Mostovshchikova, Elena/0000-0001-8527-3195 Nomerovannaya, Larisa/0000-0001-7420-3511 Sukhorukov, Yuri/0000-0002-8874-1019
Number-of-Cited-References	17
Usage-Count-Since-2013	6
Journal-ISO	J. Exp. Theor. Phys.
Doc-Delivery-Number	528DR