Magnetoresistance of the La0.7Ca0.3MnO3 single crystal / Bebenin N. G.,Zainullina R. I.,Bannikova N. S.,Elokhina L. V.,Ustinov V. V.,Mukovskii Ya. M. // PHYSICS OF METALS AND METALLOGRAPHY. - 2009. - V. 108, l. 3. - P. 232-236.

ISSN/EISSN:

0031-918X / 1555-6190

Type:

Article

Abstract:

The dependence of the resistance rho of the La0.7Ca0.3MnO3 single crystal on the temperature (in a range of 77 < T < 410 K) and magnetic field H is studied. The dependence of the magnetoresistance Delta rho/rho of the ferromagnetic phase on the field is shown to be determined by the competition of two mechanisms. In low magnetic fields, the magnetoresistance is positive Delta rho/rho > 0 and is determined by changes in the resistance with changing magnetization orientation with respect to the crystallographic axes; in high magnetic fields, the magnetoresistance is negative Delta rho/rho < 0, since it is the suppression of spin fluctuations in the magnetic field that plays the principal role. The phase transition from the ferromagnetic to paramagnetic state is a first-order transition close to the second-order one. In the transition range, the magnetoresistance is determined by the resistivity in the zero field rho(T) and by the shift of the transition temperature T (C)(H) in the magnetic field. In the paramagnetic state, the resistivity rho(T) has an activation character; similarly to the magnetoresistance of other lanthanum manganites, the magnetoresistance of this single crystal is controlled by a change in the activation energy in the magnetic field.

Author keywords:

MANGANITES; TRANSPORT

DOI:

10.1134/S0031918X09090038

Web of Science ID:

ISI:000270327800003

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	SEP
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
EISSN	1555-6190
Keywords-Plus	MANGANITES; TRANSPORT
Research-Areas	Metallurgy \& Metallurgical Engineering
Web-of-Science-Categories	Metallurgy \& Metallurgical Engineering
ResearcherID-Numbers	Zainullina, Rimma/J-4287-2013 Bannikova, Nataly/J-5273-2013 Ustinov, Vladimir/G-7501-2011 Bebenin, Nikolay/K-6955-2013
ORCID-Numbers	Zainullina, Rimma/0000-0002-0353-4775 Bannikova, Nataly/0000-0002-8716-5128 Ustinov, Vladimir/0000-0002-5155-7947 Bebenin, Nikolay/0000-0003-2035-6103
Funding-Acknowledgement	Russian Foundation for Basic Research {[}06-02-16085]
Funding-Text	This work was supported in part by the Russian Foundation for Basic Research, project no. 06-02-16085.
Number-of-Cited-References	16
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	5
Journal-ISO	Phys. Metals Metallogr.
Doc-Delivery-Number	500TL