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    National Tsing Hua University Institutional Repository > 理學院 > 物理系 > 期刊論文 >  Correlation between weak ferromagnetism and crystal symmetry in Gd2CuO4-type cuprates

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/54773

    Title: Correlation between weak ferromagnetism and crystal symmetry in Gd2CuO4-type cuprates
    Authors: Luo, H.M.;Hsu, Y.Y.;Lin, B.N.;Chi, Y.P.;Lee, T.J.;Ku, H.C.
    教師: 古煥球
    Date: 1999
    Publisher: American Physical Society
    Relation: Physical Review B (Condensed Matter), American Physical Society, Volume 60, Issue 18, Nov. 1999, Pages 13119-13124
    Keywords: weak ferromagnetism
    crystal symmetry
    Gd2CuO4-type cuprates
    powder X-ray Rietveld refinement analysis
    ionic size
    Abstract: Correlation between copper weak ferromagnetism (WF) and crystal structural symmetry of the Gd2-xMxCuO4 (M=Bi or Tb; 0⩽x⩽0.5) systems is reported. Detailed powder X-ray Rietveld refinement analysis on Gd2-xMxCuO4 shows a systematic variation of oxygen distortion angle α(Cu-O-Cu) with ionic size where the lattice layer mismatch lowers the crystal symmetry to an orthorhombic O'-phase with pseudotetragonal lattice parameter a0~b0~5.508 Å. Weak ferromagnetic or canted antiferromagnetic order is the direct result of this oxygen distortion which causes a σ-transfer Cu(3d(x2-y2))-O(2pσ)-Cu(3d(x2-y2)) superexchange interaction in the CuO2 plane with a non-180° coupling angle. The small WF saturation moment ms of ~2-6×10-2μB/Cu2+ can be deduced from the copper moment μ(Cu2+) canting angle &thetas;=(π-α)/2~2-7°. Magnetic data and internal exchange field Bint estimation indicate that Cu2+ WF saturation moment ms(Cu2+) decreases with larger Bi3+ doping and increases with smaller Tb3+ doping
    URI: http://www.aps.org/
    Appears in Collections:[物理系] 期刊論文

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