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Magnetism and CMR in Electron Doped Perovskite and Layered Manganites

Published online by Cambridge University Press:  10 February 2011

A. Maignan ,
C. Martin ,
M. Hervieu  and
B. Raveau
A. Maignan
Affiliation:
Laboratoire CRISMAT -UMR6508 - ISMRA - CNRS, Boulevard du Maréchal Juin, 14050 CAEN, France, [email protected]
C. Martin
Affiliation:
Laboratoire CRISMAT -UMR6508 - ISMRA - CNRS, Boulevard du Maréchal Juin, 14050 CAEN, France, [email protected]
M. Hervieu
Affiliation:
Laboratoire CRISMAT -UMR6508 - ISMRA - CNRS, Boulevard du Maréchal Juin, 14050 CAEN, France, [email protected]
B. Raveau
Affiliation:
Laboratoire CRISMAT -UMR6508 - ISMRA - CNRS, Boulevard du Maréchal Juin, 14050 CAEN, France, [email protected]
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Abstract

From the magnetic phase diagrams established for Ln1−xAExMnO3 manganites with x>0.5, it is shown that the magnetoresistance is only obtained for compositions of smallest average Asite cations <rA>. The magnetic structure study reveals that the small <rA> favors the coexistence of ferromagnetism with G-type antiferromagnetism. It is also shown that ferromagnetism can be induced in the Ln2−xAExMnO4 type electron doped manganites by using compositions with small Ln and AE cations and x values close to 1.90. Finally, manganse site doping by Cr, Co, Ni can be used to weaken the charge-ordering of the Mn4+ rich perovskite manganites (0.5<x≤0.8) and thus to induce CMR properties.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 602: Symposium JJ – Magnetoresistive Oxides & Related Materials , 1999 , 145
Copyright
Copyright © Materials Research Society 2000

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