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

本报告的目的是利用近十年发展起来的共振X射线荧光光谱来阐明某些准晶的电子结构。(1)在高能加速器研究机构的光子工厂，用三束时间测量了四种准晶合金中的Mn-Kβ光电子能谱和稀土系统中的Lα和Lβ谱。1)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-Mn-Si)、与I-Al-Mn-Si近似的α相和十方相Al-Mn-Fe-Ge(d-Al-Mn-Fe-Ge)准晶的入射光子发射光谱。对于d-Al-Mn-Fe-Ge，还测量了Fe Kβ；1，3&gt；谱。还收集了锰化合物(氧化物和KMnO_4)光谱，作为非金属材料的标准。所有这些准晶的光谱都显示出很小的Kβ峰，它与Kβ_1，3&gt；的比值意味着…密度的分裂。高自旋和低自旋的f态较多，与KMnO4(+7)类似。I-Al-Mn-Si的光谱与α相基本一致。结果表明，虽然α相的结构与Al-Mn-Si准晶具有第二近似的结构，但它们的电子结构非常接近。整个谱线I-Al-Pd-Mn也与之相似，但在Kβ_1，3&gt；峰与Kβ‘之间有一个特征峰，该峰在其他材料中未见报道。在这些准晶中，d-Al-Mn-Fe-Ge中Kβ‘与Kβ_1，3&gt；的峰高比最高。在这些准晶中，只有这个系统才表现出铁磁性，因此它可能起源于d态的分裂。在室温下测量了Lα_&lt；1，2&gt；和Lβ_1在F型二十面体Zn-Mg-RE(RE：Ho，Dy)中的光电子能谱。它们显示出大的四极峰，峰值能量随着入射X射线能量的增加而增加。两种体系的四极分裂程度基本相同，但峰形略有不同。较少

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