Study on Effects of Pr to Site Specific Electronic Structure of High Tc Superconducting Oxide probed by soft-x-ray absorption and emission spectroscopy

软X射线吸收和发射光谱研究Pr对高温超导氧化物位点电子结构的影响

• 批准号: 11640341
• 负责人: YAMADA Nobuyoshi
• 金额: $ 2.24万
• 依托单位: The University of Electro-Communications
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11640341/
• 关键词: 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

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

从o 1 s总X射线 - 荧光产率和OKαX射线荧光率的测量值中记录了PRBA_2CU_3O_7和YBA_2CU_3O_7中氧的特定电位电子结构。物种中X射线惊喜光谱（XAS）的极化依赖性归因于等效氧位点中的四个兴奋：O（1）链，O（1）链，O（2）和O（3）和O（3）的平面内，以及O（4）的氧气氧气和O（4）根尖的氧气和氧的孔状态。此后，我们通过O KA X射线发射光谱（XES）获得了位点特异性电子结构，通过使用极化和孔状态的能量依赖性来激发目标氧。在PRBA_2CU_3O_7）的O（2,3）的光谱中观察到PR 4F和O P-π轨道之间杂交的证据，该光谱由Fehrenbacher：和大米预测。基于Fehrenbacher和水稻模型，频谱与列支敦士登和Mazin的频带理论计算一致。prba_2cu_4o_8和yba_2cu_4o_8中氧的特定位点电子结构是从O 1 S总X型 - 折线量和ka ka ka ka ka ka ka ka ka ka ka ka ka ka recune录制的。晶体。在这些化合物中也获得了Fehrenbacher和大米的理论的一致结果

项目成果

xian Han, Katsutoshi Oka, Nobuyoshi Yamada, and Takeo Irik: "Zero Bias Anorfmaly and Preferred Surface Grain Orientation of YBa_2Cu_3O_<7-δ> Ceramics"Jpn. J. Appl. Phys.. Vol.38. 4722-4726 (1999)

xian Han、Katsutoshi Oka、Nobuyoshi Yamada 和 Takeo Irik：“YBa_2Cu_3O_<7-δ> 陶瓷的零偏压和优选表面晶粒取向”J. Appl. 4722-4726（1999 年）。

X. Han, K. Yamamukai, K. Oka, N. Yamada and T. Iri: "Study of YBa_2Cu_3O_<7-δ> ceramics/Al interface"applied Surface Science. Vol.169-170. 331-334 (2001)

X. Han、K. Yamamukai、K. Oka、N. Yamada 和 T. Iri：“YBa_2Cu_3O_<7-δ> 陶瓷/Al 界面的研究”，应用表面科学，第 169-170 卷（2001 年）。

T. Mizokawa, C. Kim, Z.-X. Shen, A. Ino, T. Yoshida, A. Fujimori, M. Goto, H. Eisaki, S. Uchida, M. Tagami, K. Yoshida, A. Rykov. Y. Siohara, K. Tomimoto, S. Tajima, Yuh Yamada, S. Horii, N. Yamada, Yasuji Yamada, and I. Hirabayashi: "Angle-Resolved Photo

T. Mizokawa，C. Kim，Z.-X。

T.Mizokawa, et al.: "Angle-Resolved Photoemission study of Iusulating and Metcellic Cu-O chain in PrBa_2Cu_3O_7 and PrBa_2Cu_4O_8"Phys. Rev. Let.. 85. 4779-4782 (2000)

T.Mizokawa 等人：“PrBa_2Cu_3O_7 和 PrBa_2Cu_4O_8 中 Iusulated 和 Metcellic Cu-O 链的角分辨光发射研究”Phys。

Xiao Han, K.Oka, N.Yamada, T.Iri: "Zero Bias Anormaly and Preffered Surface Grain Orientation of YBa_2Cu_3O_<7-8>"Jpn. J. Appl. Phys.. 38. 4722-4726 (1999)

小韩，K.Oka，N.Yamada，T.Iri：“YBa_2Cu_3O_<7-8>的零偏异常和首选表面晶粒取向”Jpn。