| Project/Area Number |
11640341
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
固体物性Ⅱ(磁性・金属・低温)
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| Research Institution | The University of Electro-Communications |
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Principal Investigator |
YAMADA Nobuyoshi The University of Electro-Communications, Department of Applied Physics and Chemistry, Professor, 電気通信学部, 教授 (40017405)
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| Co-Investigator(Kenkyū-buntansha) |
YAMADA Yuh Shimane University, Faculty of Science and Engineering, Department of Material Science, Associate Professor, 総合理工学部, 助教授 (10242835)
TEZUKA Yasuhisa Hirosaki University, Faculty of Science and Technology, Associate Professor, 理工学部, 助教授 (20236970)
YAMAZAKI Hisahi The University of Electro-Communications, Department of Applied Physics and Chemistry, Associate Professor, 電気通信学部, 助教授 (00017394)
NAKAMURA Jin The University of Electro-Communications, Department of Applied Physics and Chemistry, Research Associate, 電気通信学部, 助手 (50313416)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2000: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1999: ¥2,300,000 (Direct Cost: ¥2,300,000)
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| Keywords | high Tc Superconductor / YBa_2Cu_3O_<7-δ> / PrBa_2Cu_3O_7 / PrBa_2Cu_4O_8 / X線吸収分光 / X線発光分光 |
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| Research Abstract |
The site specific electronic structures of oxygen in PrBa_2Cu_3O_7 and YBa_2Cu_3O_7 compounds were recorded from the measurements of O 1 s total x-ray-fluorescence yield and O Kα x-ray fluorescence emission spectra of PrBa_2Cu_3O_7 and YBa_2Cu_3O_7 single crystals. The polarization dependence of the x-ray absorption spectra(XAS) near oxygen absorption edge in the specimens is attributed to the excitation of four in equivalent oxygen sites : O(1) chain, O (2) and O(3) in-plane, and O(4) apical oxygens and the hole states of the oxygens were specified. Thereafter, we obtained the site specific electronic structure by the O Ka x-ray emission spectra (XES), exciting the target oxygen by the use of polarization and energy dependence of hole state. The evidence of hybridization between the Pr 4f and O p-π orbital was observed in the spectrum of O(2,3) in plane of PrBa_2Cu_3O_7) which was predicted by Fehrenbacher : and Rice. The spectrum is consistent with the band theoretical calculation by Liechtenstein and Mazin, based on the Fehrenbacher and Rice model.
The site specific electronic structures of oxygen in PrBa_2Cu_4O_8 and YBa_2Cu_4O_8 compounds were recorded from the measurements of O 1 s total x-ray-fluorescence yield and O Ka x-ray fluorescence emission spectra of the single crystals. Consistent results with the theory by Fehrenbacher and Rice were obtained also in these compounds
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