Magnetic properties and low-field magnetoresistance of La0.7Sr0.3Mn0.9M0.1O3 compounds (M=A1, Cr, Mn, Fe, Co, Ni, Cu, and Ga)

A systematic study of the Mn-site substitution by M = Al, Cr, Fe, Co, Ni, Cu, and Ga in polycrystalline La0.7Sr0.3Mn0.9M0.1O3 compounds has been carried out. It was deduced from the experimental data that the magnetic coupling between the M and Mn ions is antiferromagnetic for Cr3+ and Fe3+, and fer...

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Veröffentlicht in:	Journal of alloys and compounds 2008-07, Vol.459 (1-2), p.29-34
Hauptverfasser:	ZHAO, T.-S, XIANYU, W. X, LI, B. H, QIAN, Z. N
Format:	Artikel
Sprache:	eng
Schlagworte:	Condensed matter: electronic structure, electrical, magnetic, and optical properties Exact sciences and technology Magnetic properties and materials Magnetotransport phenomena, materials for magnetotransport Manganites Physics
Online-Zugang:	Volltext
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Zusammenfassung:	A systematic study of the Mn-site substitution by M = Al, Cr, Fe, Co, Ni, Cu, and Ga in polycrystalline La0.7Sr0.3Mn0.9M0.1O3 compounds has been carried out. It was deduced from the experimental data that the magnetic coupling between the M and Mn ions is antiferromagnetic for Cr3+ and Fe3+, and ferromagnetic for Co2+/3+, Ni2+, and Cu2+. The variation of the Curie temperature versus M was discussed in terms of the double-exchange (DE) interaction of Mn3+OMn4+ as well as the superexchange interactions between the M and Mn ions. It is found that the Mn-site substitution by various M could not enhance the MR response at a low magnetic field of 2 kO.
ISSN:	0925-8388 1873-4669
DOI:	10.1016/j.jallcom.2007.04.302