Universität zu Köln

Kalanda, Nikolay ORCID: 0000-0001-7679-4968, Yarmolich, Marta ORCID: 0000-0002-8005-2171, Teichert, Steffen, Bohmann, Arne, Petrov, Alexander ORCID: 0000-0003-1208-5913, Moog, Daniel and Mathur, Sanjay (2018). Charge transfer mechanisms in strontium ferromolybdate with tunneling barriers. J. Mater. Sci., 53 (11). S. 8347 - 8355. NEW YORK: SPRINGER. ISSN 1573-4803

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Abstract

The single-phase strontium ferromolybdate powder with the double perovskite structure has been synthesized by the citrate-gel method with superstructural ordering of iron and molybdenum cations of 88%. The formation of the SrMoO4 phase on the intergrain boundaries has been determined by means of the XRD studies, the Electrokinetic Sonic Analysis technique, and FESEM investigations of pressed Sr2FeMoO6-delta powders subjected to the isothermic treatment at 700 K and p(O-2) = 10 Pa. The temperature dependence of the electrical resistivity in the temperature range 4.2-300 K has a metallic type in the single-phase Sr2FeMoO6-delta compound and the semiconductor type in the Sr2FeMoO6-delta-SrMoO4-Sr2FeMoO6-delta structure with dielectric sheaths. In the latter case, a hopping mechanism of charge transfer is observed. In the applied magnetic field, the temperature dependence does not change qualitatively; however, the resistivity decreases with increasing field, i.e., a negative magnetoresistive effect appears, reaching 43.6% at 10 T and 10 K. The external field forms a collinear spin structure, thus increasing the spin-polarized current through the energy barriers in the granular Sr2FeMoO6-delta-SrMoO4-Sr2FeMoO6-delta heterostructure.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Kalanda, Nikolay UNSPECIFIED orcid.org/0000-0001-7679-4968 UNSPECIFIED Yarmolich, Marta UNSPECIFIED orcid.org/0000-0002-8005-2171 UNSPECIFIED Teichert, Steffen UNSPECIFIED UNSPECIFIED UNSPECIFIED Bohmann, Arne UNSPECIFIED UNSPECIFIED UNSPECIFIED Petrov, Alexander UNSPECIFIED orcid.org/0000-0003-1208-5913 UNSPECIFIED Moog, Daniel UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-185830
DOI:	10.1007/s10853-018-2148-0
Journal or Publication Title:	J. Mater. Sci.
Volume:	53
Number:	11
Page Range:	S. 8347 - 8355
Date:	2018
Publisher:	SPRINGER
Place of Publication:	NEW YORK
ISSN:	1573-4803
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Inorganic Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LOW-FIELD MAGNETORESISTANCE Multiple languages Materials Science, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/18583