Strain-Induced Ferromagnetism and Magnetoresistance in Epitaxial Thin Films of LaCoO3 Prepared by Polymer-Assisted Deposition

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• 作者：Francisco Rivadulla ; Zhenxing Bi ; Eve Bauer ; Beatriz Rivas-Murias ; Jos茅 Manuel Vila-Fungueiri帽o ; Quanxi Jia
• 刊名：Chemistry of Materials
• 出版年：2013
• 出版时间：January 8, 2013
• 年：2013
• 卷：25
• 期：1
• 页码：55-58
• 全文大小：306K
• 年卷期：v.25,no.1(January 8, 2013)
• ISSN：1520-5002

文摘

High quality epitaxial thin films of LaCoO₃ on SrTiO₃ have been prepared by spin-coating of a metal/polymeric aqueous solution. The films (鈮?17 nm) are homogeneous and smooth over large areas. The characteristic low-spin (LS) state is replaced by a higher spin configuration of Co(III), due to strain-induced distortions of the CoO₆ octahedra, introducing a ferromagnetic interaction and negative magnetoresistance below T_C = 85 K. This simple chemical method produces the high-quality films required for either fundamental studies or applications, similar to physical deposition techniques.

Keywords:

thin-film solution synthesis; spin-state transition