Magnetic and electronic ground states of B-site-substituted LaMnO3:: from antiferromagnetism to ferromagnetism

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:280

Article

Vertruyen, B ; Flahaut, D ; Hébert, S ; Maignan, A ; Martin, C ; Hervieu, M ; Raveau, B

关键词: manganites;    magnetic structure;    exchange interactions;    AC susceptibility;   

DOI  :  10.1016/j.jmmm.2004.02.023

来源: Elsevier

【 摘 要 】

We report about the physical properties of samples obtained by different substitutions on the Mn site of LaMnO3: LaMn0.85Ni0.15O3, LaMn0.85Ga0.15O3 and LaMn0.5Ga0.5O3. It is well known that the antiferromagnetic orbitally ordered ground state of LaMnO3 is easily destroyed to give way to ferromagnetism. However, this ferromagnetic behaviour can result from several mechanisms: depending on the nature of the substituting cation and on the substitution level, the physical properties derived from a complex interplay between exchange interactions, orbital ordering and Jahn-Teller distortion. As a result, there are noticeable differences between the physical properties of the different samples, even though all three samples display a ferromagnetic component in zero applied magnetic field. In this paper we compare the crystallographic, electrical and magnetic properties of these samples, with a special attention for the AC susceptibility behaviour. (C) 2004 Elsevier B.V. All rights reserved.

【 授权许可】

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