Synthesis, structure, electric transport and magnetic properties of Sr2LaMnFeO7 and Sr2LaMn1.5Fe0.5O7

Authors
Sharma, IB Magotra, SK Singh, D Batra, S Mudher, KDS
Citation
Ib. Sharma et al., Synthesis, structure, electric transport and magnetic properties of Sr2LaMnFeO7 and Sr2LaMn1.5Fe0.5O7, J ALLOY COM, 291(1-2), 1999, pp. 16-20
Citations number
18
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF ALLOYS AND COMPOUNDS
ISSN journal
09258388 → ACNP
Volume
291
Issue
1-2
Year of publication
1999
Pages
16 - 20
Database
ISI
SICI code
0925-8388(19990927)291:1-2<16:SSETAM>2.0.ZU;2-1
Abstract
New RP-type phases Sr2LaMnFeO7 and Sr2LaMn1.5Fe0.5O7 have been synthesised by the ceramic method. Rietveld profile analysis shows that these phases cr ystallize with tetragonal unit cell in the space group I4/mmm. Sr2LaMn1.5Fe 0.5O7 shows insulator-metal (I-M) transition at low temperatures, the pheno menon often associated with giant magnetoresistance. 3D variable range hopp ing governs the electrical conduction in the insulator region above the I-M transition temperature. Magnetic studies suggest that the Curie temperatur e (theta) is positive. (C) 1999 Elsevier Science S.A. All rights reserved.