TY - JOUR
T1 - Reduction and oxidation annealing effects on Cu K-edge XAFS for electron-doped cuprate superconductors
AU - Asano, S.
AU - Suzuki, K. M.
AU - Matsumura, D.
AU - Ishii, K.
AU - Ina, T.
AU - Fujita, M.
N1 - Funding Information:
1Department of Physics, Tohoku University, Sendai, Japan, 2Institute for Materials Research, Tohoku University, Sendai, Japan, 3Quantum Beam Science Center, Japan Atomic Energy Agency, Hyogo, Japan, 4Synchrotron Radiation Research Center, National Institutes for Quantum and Radiological Science and Technology, Hyogo, Japan, 5Japan Synchrotron Radiation Research Institute, Hyogo, Japan
Funding Information:
We thank Y. Kimura for the fruitful discussion. The experiment at SPring-8 was carried out under Project No. 2016A1603. M.F. is supported by Grant-in-Aid for Scientific Research (A) (16H02125).
Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
PY - 2018/4/19
Y1 - 2018/4/19
N2 - Reduction and oxidation annealing effects on the electronic states around the copper sites for Pr2-xCe x CuO4 and Nd2-xCe x CuO4 with x = 0 and x = 0.15 were investigated by Cu K-edge x-ray absorption measurements. Cu K near-edge spectra were changed by the reduction annealing in a manner similar to the case of Ce substitution for both x = 0 and x = 0.15. This means an increase of electron density at the copper sites, indicating the aspect of electron doping in the reduction annealing. This reduction annealing effect on the near-edge spectra are reverted by the additional oxidation annealing. The amount of electron density around the copper sites is varied by the reduction and oxidation annealing, reversibly, corresponding to the reversible variation of the physical property from insulating to superconductivity.
AB - Reduction and oxidation annealing effects on the electronic states around the copper sites for Pr2-xCe x CuO4 and Nd2-xCe x CuO4 with x = 0 and x = 0.15 were investigated by Cu K-edge x-ray absorption measurements. Cu K near-edge spectra were changed by the reduction annealing in a manner similar to the case of Ce substitution for both x = 0 and x = 0.15. This means an increase of electron density at the copper sites, indicating the aspect of electron doping in the reduction annealing. This reduction annealing effect on the near-edge spectra are reverted by the additional oxidation annealing. The amount of electron density around the copper sites is varied by the reduction and oxidation annealing, reversibly, corresponding to the reversible variation of the physical property from insulating to superconductivity.
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U2 - 10.1088/1742-6596/969/1/012051
DO - 10.1088/1742-6596/969/1/012051
M3 - Conference article
AN - SCOPUS:85046090845
SN - 1742-6588
VL - 969
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
IS - 1
M1 - 012051
T2 - 28th International Conference on Low Temperature Physics, LT 2018
Y2 - 9 August 2017 through 16 August 2017
ER -