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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/27631


    Title: Spin gap effect on bulk R1+xBa2-xCu3O7-δ (R=Eu or Nd and 0≦x≦0.4)
    Authors: You, C. Y.;錢凡之;Chien, F. Z.;Guan, Weiyan
    Contributors: 淡江大學物理學系
    Keywords: High-T c superconductors;spin gap;electronic transport
    Date: 1998-12-01
    Issue Date: 2009-12-31 10:31:25 (UTC+8)
    Publisher: Springer
    Abstract: Spin gap effects on the underdoping states of the bulk system of R1+x Ba2−x Cu3O7−δ (R = Eu or Nd and 0 ≤ x ≤ 0.4) were investigated through transport property measurements. The underdoping states were achieved by, alternatively substituting R3+ for Ba2+ ions in the system rather than adjusting the oxygen deficiency. The excess R3+ ions were to occupy the Ba sites of the crystalline lattice as revealed from Rietveld analysis for powder X-ray diffraction. The underdoped materials were observed to first undergo spin pairing transition in the temperature range well above T c, and come across with superconducting transition at T c. The increasing feature observed for spin gap temperature and the decreasing one for T c, as the concentration of holes decreases, are in qualitatively good agreement with theoretical predictions from the mean-field RVB model.
    Relation: Journal of Superconductivity 11(6), pp.693-698
    DOI: 10.1023/A:1022628820401
    Appears in Collections:[物理學系暨研究所] 期刊論文

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