NMR study of carrier distribution and superconductivity in multilayered high-Tc cuprates

H. Kotegawa, Y. Tokunaga, K. Ishida, G. Q. Zheng, Y. Kitaoka, K. Asayama, H. Kito, A. Iyo, H. Ihara, K. Tanaka, K. Tokiwa, T. Watanabe

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81 Citations (Scopus)


We report 63Cu-Knight shift measurement on multilayered high-Tc cuprate oxides that include inequivalent outer (OP) and inner (IP) CuO2 planes in a unit cell with number of planes n = 3-5. Using an experimental relation between the spin part of Knight shift (Ks) and the carrier concentration (Nh) reported in n = 1 and 2 cuprates, the local carrier concentrations Nh(OP) in the OP and Nh(IP) in the IP have been deduced. We have found that Nh(OP) is larger than Nh(IP) in all the systems. The difference in the doping level increases as total-carrier content δ and n increase. Imbalance between Nh(OP) and Nh(IP) is suggested to be caused by a mechanism that the electrostatic potential associated with the apical oxygen has more attraction for holes in the OP than in the IP. It is also suggested that Tc of Hg1223 (n = 3) is the highest (Tc = 133 K) to date, due to Nh(IP) optimized to Nh,optimum to approximately 0.2. From the fact that Nh(OP)>Nh,optimum, we propose that if Nh(OP) could also be optimized in addition to optimized Nh(IP), Tc might be raised higher than 133 K.

Original languageEnglish
Pages (from-to)171-175
Number of pages5
JournalJournal of Physics and Chemistry of Solids
Issue number1-2
Publication statusPublished - Jan 2001
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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