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Discontinuous Evolution of the Highly Distorted Orthorhombic Structure and the Magnetic Order in LaMnO3±δ Perovskite

✍ Scribed by F. Prado; R.D. Sánchez; A. Caneiro; M.T. Causa; M. Tovar

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
263 KB
Volume
146
Category
Article
ISSN
0022-4596

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✦ Synopsis

In this work we present a systematic study of the crystallographic structure and the magnetic ordering of LaMnO 3؎ perovskites. Changing the oxygen composition within the range 2.995 < 3 ؎ < 3.140, we found a 3 ؉ 1 value (3.04 < 3 ؉ 1 < 3.05) which de5nes a boundary in the magnetic phase diagram T vs 3 ؎ . For 3 ؉ < 3 ؉ 1 , antiferromagnetic order is present in the samples with a small ferromagnetic component, while for large 3 ؉ values (3 ؉ > 3 ؉ 1 ) the samples are ferromagnetic. The transition from one region to the other is associated with a change in volume of around 1%.

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