A study of electronic properties in quasicrystals with resonant X-ray flourescence

共振X射线荧光研究准晶体的电子性质

• 批准号: 11640368
• 负责人: WATANABE Yasuhiro
• 金额: $ 2.3万
• 依托单位: University of Tokyo
• 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-11640368/
• 关键词: quasicrystal; resonant flourescense; SOR; icosahedral phase; decagonal phase; Al-Pd-Mn; Al-Mn-Si; Al-Mn-Fe-Ge

The objective of this report is to clarify the electronic structure in some quasicrystals by using resonant X-ray fluorescence spectroscopy, which has been developed recent decade. (1) Mn-Kβ photoemission spectra in four kinds of alloy of quasicrystals and (2) Lα and Lβ spectra in Rear Earth systems were measured in three beam time at the photon factory in High Energy Accelerator Research Organization.The dependence Mn Kβ_<1,3> (3p->1s) photo emission spectra on the incident photon energy were measured in the quasicrystals of F type icosahedral Al-Pd-Mn (i-Al-Pd-Mn), P type icosahedral Al-Mn-Si (i-Al-Mn-Si), α-phase which is approximant of i-Al-Mn-Si and decagonal Al-Mn-Fe-Ge (d-Al-Mn-Fe-Ge). For d-Al-Mn-Fe-Ge, Fe Kβ_<1,3> spectrum was also measured. Manganese compounds (oxides and KMnO_4) spectra were also collected as a standard of non-metallic materials. All these spectra of quasicrystals shows very small Kβ' peak, the ratio of which to Kβ_<1,3> means the splitting between density o … More f state of high spin and low spin, and were similar to that of KMnO4 (+7). The spectrum of i-Al-Mn-Si was almost consistent with α phase. It indicates that the electronic structures of them are very close although the structure α phase has only the second approximate structure to the Al-Mn-Si quasicrystal. The whole profile i-Al-Pd-Mn was also similar to those but there was a characteristic hump at the energy between Kβ_<1,3> peak and Kβ', which hump has not been reported in any other materials. The peak height ratio of Kβ' to Kβ_<1,3> in d-Al-Mn-Fe-Ge is the highest in these quasicrystal. It may originate in the splitting of d-state because only this system shows ferromagnetism in these quasicrystals.The photoemission spectra of Lα_<1,2> and Lβ_1 in F-type icosahedral Zn-Mg-RE (RE : Ho, Dy) were measured at room temperature. They shows the large quadropole peak which peak energy increase with increasing in the incident X-ray energy. The degree of quadropole splitting are almost the same in both system although the shape of peaks have small difference between them. Less

本报告的目的是利用近几十年来发展起来的共振X射线荧光光谱法来阐明一些准晶中的电子结构，(1)四种准晶合金中的Mn-Kβ光电子发射光谱和(2)Lα。高能加速器研究组织光子工厂分三束时间测量了地球背面系统的Lβ和Lβ光谱。Mn Kβ_<1,3>的依赖性测量了F型二十面体Al-Pd-Mn(i-Al-Pd-Mn)、P型二十面体Al-Mn-Si(i-Al)准晶的(3p->1s)入射光子能量的光发射光谱-Mn-Si)，近似于 i-Al-Mn-Si 和十方 Al-Mn-Fe-Ge 的 α 相(d-Al-Mn-Fe-Ge)，还测量了Fe Kβ_<1,3>光谱作为锰化合物(氧化物和KMnO_4)光谱。所有这些准晶体的光谱都显示出非常小的 Kβ' 峰，其与 Kβ_<1,3> 的比率意味着密度 o ... More f 态之间的分裂。高自旋和低自旋，与KMnO4(+7)相似，i-Al-Mn-Si的谱图与α相几乎一致，这表明它们的电子结构非常接近，尽管是α结构。 i-Al-Pd-Mn 相仅具有与 Al-Mn-Si 准晶相似的第二个结构。i-Al-Pd-Mn 的整体分布也与这些类似，但在 Kβ_<1,3> 峰和 Kβ_<1,3> 峰之间的能量处存在特征驼峰。 d-Al-Mn-Fe-Ge 中 Kβ' 与 Kβ_<1,3> 的峰高比是这些准晶中最高的。 d态的分裂，因为只有这个系统在这些准晶体中表现出铁磁性。F型中Lα_<1,2>和Lβ_1的光电发射光谱在室温下测量了二十面体 Zn-Mg-RE（RE：Ho、Dy），它们显示出较大的四极杆峰，其峰值能量随着入射 X 射线能量的增加而增加，两者的四极杆分裂程度几乎相同。系统虽然峰的形状差异较小。

项目成果

Yasuhiro Watanabe: "X-ray magnetic circular dichroism in quasicrystals"Material Science & Engineering A. 294-296. 617-620 (2000)

渡边泰弘：“准晶体中的 X 射线磁圆二色性”材料科学

Y.Watanabe, J.Tamura, H.Shoji, S.Nanao T.Nakamura and Y.Yokoyama: "X-ray Magnetic Cirlular Dichroism in quasicrystals"Material Science & Engineering A. 294-296. 617-620 (2000)

Y.Watanabe、J.Tamura、H.Shoji、S.Nanao T.Nakamura 和 Y.Yokoyama：“准晶体中的 X 射线磁圆二色性”材料科学

Yasuhiro Watanabe: "X-ray magnetic circular dichroism in quasicrystals"Material Science & Engineering A. 294-296. 617-620 (2000)

渡边泰弘：“准晶体中的 X 射线磁圆二色性”材料科学