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Title: Preparation and Magnetic Properties of (La1−xSr1+x)(Mn0.5Co0.5)O4
Authors: Lin, M. Y.;Wang, Y. F.;Ling, D. C.;Sheu, H. S.;Kao, H.-C. I.
Contributors: 化學系
Keywords: (La 1-xSr 1+x)(Mn 0.5Co 0.5)O 4;Ferromagnetic;K2NiF4;Paramagnetic;Unit cell parameters
Date: 2010-07
Issue Date: 2013-06-06T02:33:25Z
Publisher: Springer Science+Business Media
Abstract: A series of single phase (La 1-xSr 1+x) (Mn 0.5Co 0.5)O 4 (0 ≤ x ≤ 0.40) materials with a tetragonal K 2NiF 4 structure was prepared by a solid state reaction method at 1400 or 1450 °C with a short period of heating time. Powder X-ray diffraction (XRD) and the Rietveld refinement method were employed for the structural analysis. Unit cell a- and c-axes decrease with increasing amount of Sr substitution. A discrepancy between the zero-field-cooled and the field-cooled magnetization is observed in all samples investigated below a characteristic temperature, T *, which likely arises from the canted nature of spins or the random freezing of spins. It appears that T * decreases with increasing amount of Sr substitution, which is possibly due to the enhancement of chemical pressure induced by Sr and a corresponding increases of the valence of Mn and/or Co.
Relation: Journal of Superconductivity and Novel Magnetism, 23(5): 721-724
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