Bulk electronic structure of lanthanum hexaboride ( LaB6 ) by hard x-ray angle-resolved photoelectron spectroscopy

A. Rattanachata, L. Nicolaï, H. Martins, G. Conti, M. Verstraete, M. Gehlmann, S. Ueda, Keisuke L. I. Kobayashi, I. Vishik, C. Schneider, C. Fadley, A. Gray, J. Minár, S. Nemšák
{"title":"Bulk electronic structure of lanthanum hexaboride (\nLaB6\n) by hard x-ray angle-resolved photoelectron spectroscopy","authors":"A. Rattanachata, L. Nicolaï, H. Martins, G. Conti, M. Verstraete, M. Gehlmann, S. Ueda, Keisuke L. I. Kobayashi, I. Vishik, C. Schneider, C. Fadley, A. Gray, J. Minár, S. Nemšák","doi":"10.1103/PhysRevMaterials.5.055002","DOIUrl":null,"url":null,"abstract":"We investigate the bulk electronic structure of lanthanum hexaboride using tender-hard x-ray photoemission spectroscopy, measuring both core-level and angle-resolved valence-band spectra. We compare the La 3d core level spectrum to cluster model calculations in order to understand the bulk-like core-hole screening effects. The results show that the La 3d well-screened peak is at a lower binding energy compared to the main poorly-screened peak and the relative intensity between these peaks depends on how strong the hybridization is between La and B atoms. We show that the recoil effect, negligible in the soft x-ray regime, becomes prominent at higher kinetic energies for lighter elements, such as boron, but is still negligible for heavy nuclei, such as lanthanum. In addition, we report the bulk-like band structure of lanthanum hexaboride determined by tender-hard x-ray angle-resolved photoemission spectroscopy (HARPES). We compare HARPES experimental results to the free-electron final-state calculations and to the more precise one-step photoemission theory including matrix element and phonon excitation effects. The agreement between the features present in the experimental ARPES data and the theoretical calculations is remarkable. In addition, we consider the nature and the magnitude of phonon excitations in order to interpret HARPES experimental data measured at different temperatures and excitation energies. We demonstrate that one step theory of photoemission and HARPES experiments provide, at present, the only approach capable of probing, both experimentally and theoretically, true bulk-like electronic band structure of rare-earth hexaborides and strongly correlated materials.","PeriodicalId":8423,"journal":{"name":"arXiv: Applied Physics","volume":"67 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2020-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"3","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"arXiv: Applied Physics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1103/PhysRevMaterials.5.055002","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 3

Abstract

We investigate the bulk electronic structure of lanthanum hexaboride using tender-hard x-ray photoemission spectroscopy, measuring both core-level and angle-resolved valence-band spectra. We compare the La 3d core level spectrum to cluster model calculations in order to understand the bulk-like core-hole screening effects. The results show that the La 3d well-screened peak is at a lower binding energy compared to the main poorly-screened peak and the relative intensity between these peaks depends on how strong the hybridization is between La and B atoms. We show that the recoil effect, negligible in the soft x-ray regime, becomes prominent at higher kinetic energies for lighter elements, such as boron, but is still negligible for heavy nuclei, such as lanthanum. In addition, we report the bulk-like band structure of lanthanum hexaboride determined by tender-hard x-ray angle-resolved photoemission spectroscopy (HARPES). We compare HARPES experimental results to the free-electron final-state calculations and to the more precise one-step photoemission theory including matrix element and phonon excitation effects. The agreement between the features present in the experimental ARPES data and the theoretical calculations is remarkable. In addition, we consider the nature and the magnitude of phonon excitations in order to interpret HARPES experimental data measured at different temperatures and excitation energies. We demonstrate that one step theory of photoemission and HARPES experiments provide, at present, the only approach capable of probing, both experimentally and theoretically, true bulk-like electronic band structure of rare-earth hexaborides and strongly correlated materials.
查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
硬x射线角分辨光电子能谱法研究六硼化镧(LaB6)的体电子结构
我们利用软硬x射线光发射光谱研究了六硼化镧的体电子结构,测量了核能级和角分辨价带光谱。我们将La 3d岩心能级谱与聚类模型计算进行了比较,以了解块状岩心孔的筛分效果。结果表明,与屏蔽较差的主峰相比,屏蔽良好的La 3d峰具有较低的结合能,并且这些峰之间的相对强度取决于La和B原子之间杂化的强度。我们发现,在软x射线下可以忽略不计的反冲效应,在动能较高的轻元素(如硼)中变得突出,但在重核(如镧)中仍然可以忽略不计。此外,我们报道了用软硬x射线角分辨光发射光谱(HARPES)测定六硼化镧的块状带结构。我们将HARPES实验结果与自由电子末态计算和更精确的一步光发射理论(包括矩阵元素和声子激发效应)进行了比较。ARPES实验数据的特征与理论计算结果的吻合是显著的。此外,我们考虑了声子激发的性质和大小,以便解释在不同温度和激发能下测量的HARPES实验数据。我们证明了光发射一步理论和HARPES实验提供了目前唯一能够在实验和理论上探测稀土六硼化物和强相关材料的真正块状电子带结构的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 去求助
来源期刊
自引率
0.00%
发文量
0
期刊最新文献
High performance photonic microwave filters based on a 50GHz FSR optical soliton crystal Kerr micro-comb Ultra-high bandwidth fiber-optic data transmission with a single chip source High order pulse-echo (HOPE) ultrasound Data-driven modelling of scalable spinodoid structures for energy absorption Radioplasmonics: design of plasmonic milli-particles in air and absorbing media for antenna communication and human-body in-vivo applications.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1