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    Title: Magnetic ordering and dielectric relaxation in the double perovskite YBaCuFeO5
    Authors: Yen-Chung Lai;Chao-Hung Du;Chun-Hao Lai;Yu-Hui Liang;Chin-Wei Wang;Kirrily C Rule;Hung-Cheng Wu;Hung-Duen Yang;Wei-Tin Chen;G J Shu
    Keywords: multiferroics;magnetic phase transition;ferroelectric relaxation
    Date: 2017-03-01
    Issue Date: 2017-03-28 02:10:18 (UTC+8)
    Publisher: Institute of Physics Publishing Ltd.
    Abstract: Using magnetization, dielectric constant, and neutron diffraction measurements on a high quality single crystal of YBaCuFeO5 (YBCFO), we demonstrate that the crystal shows two antiferromagnetic transitions at ${{T}_{N1}}\sim 475$ K and ${{T}_{N2}}\sim 175$ K, and displays a giant dielectric constant with a characteristic of the dielectric relaxation at T N2. It does not show the evidence of the electric polarization for the crystal used for this study. The transition at T N1 corresponds with a paramagnetic to antiferromagnetic transition with a magnetic propagation vector doubling the unit cell along three crystallographic axes. Upon cooling, at T N2, the commensurate spin ordering transforms to a spiral magnetic structure with a propagation vector of ($\frac{h}{2}$ $\frac{k}{2}$ $\frac{l}{2}\pm \delta $ ), where $h$ , $k$ , and $l$ are odd, and the incommensurability δ is temperature dependent. Around the transition boundary at T N2, both commensurate and incommensurate spin ordering coexist.
    Relation: Journal of Physics: Condensed Matter 29(14), 145801(8 pages)
    DOI: 10.1088/1361-648X/aa5708
    Appears in Collections:[物理學系暨研究所] 期刊論文

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