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

doi:10.1016/S0022-3697(00)00122-0

NMR study of carrier distribution and superconductivity in multilayered high-T_c 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

Research output: Contribution to journal › Article

80 Citations (Scopus)

Abstract

We report ⁶³Cu-Knight shift measurement on multilayered high-T_c 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 (K_s) and the carrier concentration (N_h) reported in n = 1 and 2 cuprates, the local carrier concentrations N_h(OP) in the OP and N_h(IP) in the IP have been deduced. We have found that N_h(OP) is larger than N_h(IP) in all the systems. The difference in the doping level increases as total-carrier content δ and n increase. Imbalance between N_h(OP) and N_h(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 T_c of Hg1223 (n = 3) is the highest (T_c = 133 K) to date, due to N_h(IP) optimized to N_h,optimum to approximately 0.2. From the fact that N_h(OP)>N_h,optimum, we propose that if N_h(OP) could also be optimized in addition to optimized N_h(IP), T_c might be raised higher than 133 K.

Original language	English
Pages (from-to)	171-175
Number of pages	5
Journal	Journal of Physics and Chemistry of Solids
Volume	62
Issue number	1-2
DOIs	https://doi.org/10.1016/S0022-3697(00)00122-0
Publication status	Published - Jan 2001
Externally published	Yes

ASJC Scopus subject areas

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

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Kotegawa, H., Tokunaga, Y., Ishida, K., Zheng, G. Q., Kitaoka, Y., Asayama, K., Kito, H., Iyo, A., Ihara, H., Tanaka, K., Tokiwa, K., & Watanabe, T. (2001). NMR study of carrier distribution and superconductivity in multilayered high-T_c cuprates. Journal of Physics and Chemistry of Solids, 62(1-2), 171-175. https://doi.org/10.1016/S0022-3697(00)00122-0

NMR study of carrier distribution and superconductivity in multilayered high-T_c cuprates. / Kotegawa, H.; Tokunaga, Y.; Ishida, K.; Zheng, G. Q.; Kitaoka, Y.; Asayama, K.; Kito, H.; Iyo, A.; Ihara, H.; Tanaka, K.; Tokiwa, K.; Watanabe, T.

In: Journal of Physics and Chemistry of Solids, Vol. 62, No. 1-2, 01.2001, p. 171-175.

Research output: Contribution to journal › Article

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abstract = "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.",

author = "H. Kotegawa and Y. Tokunaga and K. Ishida and Zheng, {G. Q.} and Y. Kitaoka and K. Asayama and H. Kito and A. Iyo and H. Ihara and K. Tanaka and K. Tokiwa and T. Watanabe",

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AU - Kitaoka, Y.

AU - Asayama, K.

AU - Kito, H.

AU - Iyo, A.

AU - Ihara, H.

AU - Tanaka, K.

AU - Tokiwa, K.

AU - Watanabe, T.

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