High pressure synthesis, crystal, magnetic structure and magnetotransport of SrFe_0.5Co_0.5O_3−δ

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• 作者：A. Mu&#xf1 ; oz ; J.A. Alonso ; M.J. Mart&#xed ; nez-Lope ; C. de la Calle and M.T. Ferná ; ndez-D&#xed ; az
• 关键词：Ferromagnetism ; Colossal magnetoresistance ; Neutron diffraction ; High pressure synthesis ; Crystal structure ; Magnetic structure ; SrFeO₃ ; SrCoO₃
• 刊名：Journal of Solid State Chemistry
• 出版年：2006
• 期刊代码：130_00224596
• 类别：ch
• 出版时间：November 2006
• 卷：179
• 期：11
• 页码：3365-3370
• 文件大小：566 K

摘要

A polycrystalline sample with SrFe_0.5Co_0.5O_3−δ stoichiometry has been prepared under moderate pressures of 2 GPa in the presence of KClO₄ as oxidizing agent. The crystallographic and magnetic structures have been studied from neutron powder diffraction (NPD), complemented with magnetotransport and magnetic susceptibility data. The study of the crystallographic structure confirms that this compound, with the actual stoichiometry SrFe_0.5Co_0.5O_2.88(3), is a simple cubic perovskite at 2 and 295 K, defined in the Pm-3m space group, where Fe and Co atoms are distributed at random over the B positions. The magnetic measurements show that SrFe_0.5Co_0.5O_2.88 is a ferromagnet with , which is also confirmed by neutron diffraction: the magnetic structure is collinear, characterized by a propagation vector f="/science?_ob=MathURL&_method=retrieve&_udi=B6WM2-4KC2JBG-3&_mathId=mml10&_user=10&_cdi=6922&_rdoc=15&_handle=V-WA-A-W-VZ-MsSAYWA-UUA-U-AAZCWUYVEA-AAZWDYEWEA-VAEVWEWW-VZ-U&_acct=C000050221&_version=1&_userid=10&md5=f6ecf1f8aedd30ea8dc3be492225bdd4" title="Click to view the MathML source">k