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.
| 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 | |
| Publication status | Published - Jan 2001 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
Cite this
NMR study of carrier distribution and superconductivity in multilayered high-Tc cuprates. / Kotegawa, H.; Tokunaga, Y.; Ishida, K.; Zheng, Guo-Qing; 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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TY - JOUR
T1 - NMR study of carrier distribution and superconductivity in multilayered high-Tc cuprates
AU - Kotegawa, H.
AU - Tokunaga, Y.
AU - Ishida, K.
AU - Zheng, Guo-Qing
AU - Kitaoka, Y.
AU - Asayama, K.
AU - Kito, H.
AU - Iyo, A.
AU - Ihara, H.
AU - Tanaka, K.
AU - Tokiwa, K.
AU - Watanabe, T.
PY - 2001/1
Y1 - 2001/1
N2 - 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.
AB - 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.
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U2 - 10.1016/S0022-3697(00)00122-0
DO - 10.1016/S0022-3697(00)00122-0
M3 - Article
VL - 62
SP - 171
EP - 175
JO - Journal of Physics and Chemistry of Solids
JF - Journal of Physics and Chemistry of Solids
SN - 0022-3697
IS - 1-2
ER -