arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0708.1371cond-mat.str-elcond-mat.mtrl-sci
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顺磁相CeRu $_2X_2$($X$ = Si,Ge)电子结构的软X射线ARPES和硬X射线光电子能谱学研究

Electronic structures of CeRu$_2X_2$ ($X$ = Si, Ge) in the paramagnetic phase studied by soft X-ray ARPES and hard X-ray photoelectron spectroscopy

M. Yano, A. Sekiyama, H. Fujiwara, Y. Amano, S. Imada, T. Muro, M. Yabashi, K. Tamasaku, A. Higashiya, T. Ishikawa, Y. Onuki, S. Suga

摘要:

对重费米子系统CeRu $_2$ Si $_2$和处于顺磁相的$4f$局域铁磁体CeRu $_2$ Ge $_2$进行了软、硬X射线光电子能谱学(PES)研究.用软X射线$hν$依赖角分辨光电子能谱学(ARPES)研究了CeRu $_2$ Si $_2$的三维能带结构和费米面形状.通过对$4f$巡游模型和定域模型的能带结构计算,定性地解释了CeRu $_2$ Si $_2$和CeRu $_2$ Ge $_2$在费米面拓扑和非$4f$电子结构上的差异.用单杂质Anderson模型计算了CeRu $_2X_2$($X$ = Si,Ge)中Ce的价态,Ce 3d硬X射线芯能级PES和Ce 3d X射线吸收谱显示出部分$_2$对CeRu $_2$ Si $_2$中传导电子的贡献具有较强的杂化和特征.

英文摘要:

Soft and hard X-ray photoelectron spectroscopy (PES) has been performed for one of the heavy fermion system CeRu$_2$Si$_2$ and a $4f$-localized ferromagnet CeRu$_2$Ge$_2$ in the paramagnetic phase. The three-dimensional band structures and Fermi surface (FS) shapes of CeRu$_2$Si$_2$ have been determined by soft X-ray $hν$-dependent angle resolved photoelectron spectroscopy (ARPES). The differences in the Fermi surface topology and the non-$4f$ electronic structures between CeRu$_2$Si$_2$ and CeRu$_2$Ge$_2$ are qualitatively explained by the band-structure calculation for both $4f$ itinerant and localized models, respectively. The Ce valences in CeRu$_2X_2$ ($X$ = Si, Ge) at 20 K are quantitatively estimated by the single impurity Anderson model calculation, where the Ce 3d hard X-ray core-level PES and Ce 3d X-ray absorption spectra have shown stronger hybridization and signature for the partial $4f$ contribution to the conduction electrons in CeRu$_2$Si$_2$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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