Magnetoresistance and Hall effect in La0.8Sr0.2MnO3 / Kar'kin AE,Shulyatev DA,Arsenov AA,Cherepanov VA,Filonova EA // JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS. - 1999. - V. 89, l. 2. - P. 358-365.

ISSN/EISSN:

1063-7761 / нет данных

Type:

Article

Abstract:

A comparative study of the longitudinal rho(xx) and transverse rho(xy) resistivities and magnetic susceptibility chi(ac) of La0.8Sr0.2MnO3 single crystals and ceramic samples has been conducted in a wide range of temperatures T=1.7-370 K and magnetic fields, H=0-13.6 T. It turned out that the relation rho(xy)similar to rho(xx), which is expected to hold in the case of carrier scattering by magnetic fluctuations, applies to the single crystals. In polycrystals, an additional H-dependent contribution to the resistivity tentatively attributed to plane (near grain boundaries) and bulk ``defects{''} of the magnetic sublattice has been detected. The scattering of carriers by these defects does not make a notable contribution to the anomalous Hall effect and magnetic susceptibility chi(ac). As a result, the curve of rho(xy) versus rho(xx) seems to be steeper than a linear dependence. Under the assumption that the materials under investigation are metals with constant carrier concentrations, the conductivity sigma=1/rho(xx) due to the critical magnetic scattering calculated in the molecular field approximation reproduces the main features of experimental data, namely, the drop in the amplitude and shift of the resistivity peak near the Curie point with increasing magnetic field H and also a relatively slow change in the derivative d sigma/dH with increasing temperature in the region T less than or equal to T-C. The large hole concentration of about two per unit cell derived from Hall measurements indicates that carriers of opposite signs can coexist in these materials. (C) 1999 American Institute of Physics. {[}S1063-7761(99)02308-2].

Author keywords:

CA-MN-O; GIANT MAGNETORESISTANCE; TRANSPORT-PROPERTIES; THIN-FILMS; LA1-XSRXMNO3+DELTA; PEROVSKITES; TEMPERATURE

DOI:

10.1134/1.558992

Web of Science ID:

ISI:000082546500023

Соавторы в МНС:

Другие поля

Поле	Значение
Month	AUG
Publisher	AMER INST PHYSICS
Address	CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA
Language	English
Keywords-Plus	CA-MN-O; GIANT MAGNETORESISTANCE; TRANSPORT-PROPERTIES; THIN-FILMS; LA1-XSRXMNO3+DELTA; PEROVSKITES; TEMPERATURE
Research-Areas	Physics
Web-of-Science-Categories	Physics, Multidisciplinary
ResearcherID-Numbers	Karkin, Alexander/J-6712-2013 Cherepanov, Vladimir/E-6451-2014 Shulyatev, Dmitry/M-7278-2014
ORCID-Numbers	Karkin, Alexander/0000-0003-0464-4762 Cherepanov, Vladimir/0000-0003-3653-6459 Shulyatev, Dmitry/0000-0002-7642-0277
Number-of-Cited-References	29
Usage-Count-Since-2013	6
Journal-ISO	J. Exp. Theor. Phys.
Doc-Delivery-Number	235MY