Title
Structural and magnetotransport transitions in the electron-doped <tex>$Pr_{1-x}Sr_{x}MnO_{3}(0.85\leq x\leq1)$</tex> manganites Structural and magnetotransport transitions in the electron-doped <tex>$Pr_{1-x}Sr_{x}MnO_{3}(0.85\leq x\leq1)$</tex> manganites
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Washington, D.C. ,
Subject
Physics
Chemistry
Source (journal)
Chemistry and materials
Chemistry of materials / American Chemical Society. - Washington, D.C.
Volume/pages
12(2000) :5 , p. 1456-1462
ISSN
0897-4756
ISI
000087136800039
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The exploration of the Mn4+-rich side of the Pr1-xSrxMnO3 system has allowed the extension of the domain of the cubic perovskite, by using a two-step process, combining synthesis under Ar flow at high temperature and O-2 pressure annealing at lower temperature. We show that these Pr-doped cubic perovskites exhibit a coupled structural (cubic-tetragonal) and magnetic (para-antiferro) transition connected with a resistivity jump at the same temperature. The strong interplay between lattice, charges, and spins for these oxides results from the appearance at low temperature of the distorted C-type antiferromagnetic structure. The Pr1-xSrxMnO3 magnetic phase diagram shows, for 0.9 less than or equal to x less than or equal to 1 (i.e., on the Mn4+-rich side), the existence at low temperature of C- and G-type antiferromagnetism. The absence of ferromagnetic-antiferromagnetic competition explains that magnetoresistante properties are not observed in this system, in contrast to Mn4+-rich Ln(1-x)Ca(x)MnO(3) systems.
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