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.
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