Magnesium, a promising dopant for the improvement of the CMR properties of perovskite manganites View Full Text


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Article Info

DATE

1997-12

AUTHORS

A. Maignan, B. Raveau

ABSTRACT

The study of the substitution of magnesium for manganese in the type I Pr0.7(Ca,Sr) 0.3MnO3 and type II Pr0.5Sr0.5MnO3 manganites has been performed. Remarkable colossal magneto resistance (CMR) properties have been evidenced for the manganites Pr0.7Ca0.2Sr0.1 Mn1xMgxO3, with x ≤ 0.02, for which ROT/R7T resistance ratio values ranging from 104 to 4.105 at 105 K and 70 K respectively were obtained in a magnetic field of 7 T. The study of the type II phases Pr0.5Sr0.5M1xMgxO3, shows their similarity with the trivalent metal doped manganites Pr0.5Mn1−xMxO3 with M = Al, Ga, In, in contrast to the tetravalent metal doped manganites with M = Ti, Sn. The latter properties are interpreted in terms of two factors, the molar ratio Mn(III): Mn(IV), and the size of the doping cation. More... »

PAGES

299-305

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s002570050292

DOI

http://dx.doi.org/10.1007/s002570050292

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1011916143


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