Structure,transport and magnetic properties of the double perovskite (Ca2-2xSr2x)FeMoO6 |
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| Authors: | J.B.?Shi author-information" > author-information__contact u-icon-before" > mailto:jbshi@fcu.edu.tw" title=" jbshi@fcu.edu.tw" itemprop=" email" data-track=" click" data-track-action=" Email author" data-track-label=" " >Email author,Y.Y.?Fan,P.H.?Peng,F.C.?Jou,C.Y.?Lee,H.C.?Ku,H.Z.?Chen,S.L.?Young |
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| Affiliation: | (1) Department of Electronic Engineering, Feng-Chia University, 407 Taichung, Taiwan;(2) Department of Physics, National Tsing Hua University, 300 Hsinchu, Taiwan;(3) Department of Electrical Engineering, Hsiuping Institute of Technology, 412 Taichung, Taiwan |
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| Abstract: | In this paper we report the results of a detailed investigation of the double perovskite (Ca2-2xSr2x)FeMoO6 system. Chemical size effects on structural, electrical, and magnetic properties caused by the substitution of isovalent, larger Sr ions into the smaller Ca sites, resulting in (Ca2-2xSr2x)FeMoO6, have been examined. The compounds crystallize in the monoclinic space group P21/n for 0.0 x<0.2, the orthorhombic space group Pbnm for 0.2x<0.4, and the tetragonal space group I4/m and I4/mmm for x 0.4. Examination of the resistivity of all compounds reveals a metallic behavior which is well described by a Tn dependence except for x=1.0. These n values change from 1 to 2 as T decreases lower than Tc. This is indicative of a variation in the transport mechanism at Tc. The ferrimagnetic transition temperature Tc increases with increasing x from 318 (x=0.0) to 393 K (x=1.0). For all samples, the saturation magnetization at 82 K obeys Ms3.5  B/(formula unit), compared to a theoretical spin-only moment of 4B/(formula unit) for a perfectly ordered compound. PACS 74.25.Fy; 74.25.Ha |
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