Reduction and oxidation annealing effects on Cu K-edge XAFS for electron-doped cuprate superconductors

S. Asano, K. M. Suzuki, D. Matsumura, K. Ishii, T. Ina, M. Fujita

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Article number012051
JournalJournal of Physics: Conference Series
Volume969
Issue number1
DOIs
Publication statusPublished - 2018 Apr 19
Event28th International Conference on Low Temperature Physics, LT 2018 - Gothenburg, Sweden
Duration: 2017 Aug 92017 Aug 16

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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