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    題名: Variation of anomalous Pr ordering and crystal symmetry for the oxygenated Pr1+xBa2-xCu3O7+y system
    作者: Luo, H. M.;Lin, B. N.;Lin, Y. H.;Chiang, H. C.;Hsu, Y. Y.;Hsu, T. I.;Lee, T. J.;Ku, H. C.;Lin, C. H.;Kao, H.-C. I.;Shi, J. B.;Ho, J. C.;Chang, C. H. [et. al]
    貢獻者: 淡江大學化學學系
    日期: 2000-06
    上傳時間: 2013-07-09 15:27:25 (UTC+8)
    出版者: College Park: American Physical Society
    摘要: Structural, transport, magnetic, calorimetric, and neutron data were reported for the oxygen-annealed Pr1+xBa2-xCu3O7+y or 1212-type Cu(Ba2-xPrx)PrCu2O7+y system (0<~x<~1, -0.11<~y<~0.31). Powder x-ray Rietveld analysis indicates that due to subtle oxygen distribution in the CuO1+y plane for these oxygenated cuprates, two structural symmetry transitions were observed, from orthorhombic 1212C (CuO chain) O(I) phase (space group Pmmm) for 0<~x<~0.4, to tetragonal 1212 T phase (P4/mmm) for 0.4<~x<~0.65, and then to a different type of orthorhombic 1212 O(II) phase (Cmmm) for 0.65<x<1. Resistivity data indicate that Pr-in-Ba is not favorable for metallic state and no superconductivity can be detected for these insulating cuprates. Magnetic-susceptibility, heat-capacity, and neutron-diffraction data show that, regardless of the structural transitions, the anomalous Néel temperature TN(Pr) decreases monotonically and smoothly from 18 K for x=0 to 2.5 K for x=0.8, with the same c-axis antiferromagnetic Pr spin alignment. The increasing Pr-O bond length observed with decreasing TN(Pr) indicates that this unusual Pr magnetic ordering is closely correlated with the wave-function overlap between Pr-4f orbital and eight O-2pπ orbital in the CuO2 bilayer.
    關聯: Physical Review B (Condensed Matter and Materials Physics) 61(21), pp.14825-14832
    DOI: 10.1103/PhysRevB.61.14825
    顯示於類別:[化學學系暨研究所] 期刊論文

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