Electrical and Magnetic Properties on Perovskite Compounds SrFe(Cr)_0.5-xMo_0.5+xO_3 and Sr_2Fe(Cr)_0.5-xMo_0.5+xO_4(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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We have studied the electrical and magnetic properties on perovskite compounds SrFe(Cr)_0.5-xMo_0.5-xMo_0.5+xO_3 and two-dimensional analogue Sr_2Fe(Cr)_0.5-xMo_0.5+xO_4. Magnetization measurements have indicated the possibility of ferromagnetism for Sr_2Fe(Cr)_0.5-xMo_0.5+xO_4 as well as three-dimensional systems. Electrical resistivity ρ and ferromagnetic magnetization at 5K decrease with increasing Mo content x for all titled compounds. Ferromagnetism seems to vanish at around x = 0.4, 0.3 and 0.35 for SrFe_0.5-xMo_0.5+xO_3, SrCr_0.5-xMo_0.5+xO_3 and Sr_2Fe_0.5-xMo_0.5+xO_4 systems, respectively. The ρ's of SrFe(Cr)_0.5-xMo_0.5+xO_3 systems show metallic temperature dependence for x ≧ 0.375, while weak localized feature remains at low temperature for Sr_2Fe(Cr)_0.5-xMo_0.5+xO_4 systems. No significant anomaly such as phase transition has been observed in ρ down to 0.5 K for SrFe_0.5-xMo_0.5+xO_3 with x = 0.4, 0.425 and SrCr_0.5-xMo_0.5+xO_3 with x = 0.35.
社団法人日本物理学会の論文
2002-11-15