Competing Effects of Band Filling and Steric Factors on Magnetic and Transport Properties of Double Perovskite

Qin Zhang; Heng Chang Qian; Juan Pei; Suo Jia Yuan

doi:10.4028/www.scientific.net/AMR.490-495.325

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 490-495Competing Effects of Band Filling and Steric...

Competing Effects of Band Filling and Steric Factors on Magnetic and Transport Properties of Double Perovskite

Abstract:

Ordered double perovskite oxides (Sr2-3xLa2xBax)FeMoO6 (0≤x≤0.3) have been investigated in this work. X-ray powder diffraction reveals that the crystal structure of the compounds changes from a tetragonal I4/m lattice to a cubic Fm m lattice around x=0.2. Due to the electron doping, the lattice constants increase with x. Owing to the competing contribution of electron doping and steric effect, Curie temperature of the compounds is almost unchanged. The resistivity of the parent compound shows a semiconducting behavior below room temperature, but those of the doped samples exhibit a metal-semiconductor transition. A correlation between the resistivity and metal-semiconducting transition temperature (TM-S) is observed. The resistivity and TM-S of the compounds decrease with x for x  0.2 and increase for x≥0.2.

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Advanced Materials Research (Volumes 490-495)

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325-328

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https://doi.org/10.4028/www.scientific.net/AMR.490-495.325

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March 2012

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Qin Zhang, Heng Chang Qian, Juan Pei, Suo Jia Yuan

Keywords:

Band Filling, Steric Factor

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