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    题名: Crossover from incommensurate to commensurate magnetic orderings in CoCr2O4
    作者: Chang,LJ;Huang,DJ;Li,WH;Cheong,SW;Ratcliff,W;Lynn,JW
    贡献者: 物理研究所
    关键词: FERROELECTRIC POLARIZATION;COBALT CHROMITE;REVERSAL
    日期: 2009
    上传时间: 2010-07-08 13:59:18 (UTC+8)
    出版者: 中央大學
    摘要: The conical spin order of multiferroic CoCr2O4 has been studied by a neutron diffraction to investigate its magnetic phase transitions at temperatures below 40 K. Magnetic order of a spiral spin component with an incommensurate propagation vector of (0.63, 0.63, 0) was observed at 26 K, while at 14.5 K, the incommensurate conical spin order showed a transition into the fixed commensurate propagation vector of (2/3, 2/3, 0). In addition, two satellite peaks with propagation vectors of (0.035, 0, 0) and (0, 0.035, 0) from the commensurate vector were observed. The widths of these peaks indicate a long-range magnetic order. This new magnetic configuration below 14.5 K may lead to a new model of multiferroic behavior differing from the well-known spin-current model for magnetic ferroelectricity.
    關聯: JOURNAL OF PHYSICS-CONDENSED MATTER
    显示于类别:[物理研究所] 期刊論文

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