Magnetoresistance of polycrystalline La-Y-Ba manganites at low temperatures / Nosov AP,Ustinov VV,Vasil'ev VG,Vladimirova EV // PHYSICS OF METALS AND METALLOGRAPHY. - 2002. - V. 93, l. 5. - P. 416-421.

ISSN/EISSN:

0031-918X / нет данных

Type:

Article

Abstract:

The results of experimental investigations of magnetic and transport properties of polycrystalline La0.68Y0.07Ba0.25MnO3 manganites in a temperature range,of 5 to 400 K and their dependence on the regimes of heat treatment in an oxygen flow are presented. Contributions to the magnetoresistance from the bulk of grains and grain boundaries are separated. It is shown that the contribution to the magnetoresistance due to the tunneling of spin-polarized carriers through grain boundaries is maximum at low temperatures, abruptly decreases with increasing temperature, and strongly depends on the regimes of heat treatment. The experimental results are analyzed within a model that takes into account the spin-flip processes and inelastic scattering of carriers in the course of their tunneling through nanosize grain boundaries.

Author keywords:

LOW-FIELD MAGNETORESISTANCE; MAGNETIC TUNNEL-JUNCTIONS; GRAIN-BOUNDARIES; PEROVSKITES; BEHAVIOR; DISORDER; IDEAS

DOI:

нет данных

Web of Science ID:

ISI:000176248800004

Соавторы в МНС:

Другие поля

Поле	Значение
Month	MAY
Publisher	INTERPERIODICA
Address	PO BOX 1831, BIRMINGHAM, AL 35201-1831 USA
Language	English
Keywords-Plus	LOW-FIELD MAGNETORESISTANCE; MAGNETIC TUNNEL-JUNCTIONS; GRAIN-BOUNDARIES; PEROVSKITES; BEHAVIOR; DISORDER; IDEAS
Research-Areas	Metallurgy \& Metallurgical Engineering
Web-of-Science-Categories	Metallurgy \& Metallurgical Engineering
ResearcherID-Numbers	Ustinov, Vladimir/G-7501-2011
ORCID-Numbers	Ustinov, Vladimir/0000-0002-5155-7947 Nosov, Aleksandr/0000-0003-1475-0059
Number-of-Cited-References	28
Journal-ISO	Phys. Metals Metallogr.
Doc-Delivery-Number	563GW