arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0905.0743cond-mat.str-el
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重费米子系统Ce 3 $d$芯能级谱中的电场效应:CeNi $_{1-x}$ Co $_x$ Ge $_2$的硬X射线光电子能谱

Crystalline electric field effects in Ce 3$d$ core-level spectra of heavy-fermion systems: Hard X-ray photoemission spectroscopy on CeNi$_{1-x}$Co$_x$Ge$_2$

H. J. Im, T. Ito, S. Kimura, H. -D. Kim, J. B. Hong, Y. S. Kwon

摘要:

用高分辨硬X射线光电子能谱研究了CeNi $_{1-x}$ Co $_x$ Ge $_2$(0 $\leq$ $x$ $\leq$ 1)体相Ce 3 $d$芯能级谱中电子间强关联引起的电子结构.在Ce 3 $d_{5/2}$芯能级谱中,伴随结构($f^2$峰)的变化表明Ce 4 $f$ -与传导电子之间的杂化强度随Co浓度的增加而逐渐增强,这与Ce 3 $d-4f$和4 $d-4f$共振光电子能谱的结果一致.特别是在Ce 3 $d_{3/2}$核能级谱中,$f^1$峰的多重态结构随$f$ -态的简并度而系统地变化,这种简并度源于晶体的电场效应.

英文摘要:

High-resolution hard X-ray photoemission measurements have been performed to clarify the electronic structure originating from the strong correlation between electrons in bulk Ce 3$d$ core-level spectra of CeNi$_{1-x}$Co$_x$Ge$_2$ (0 $\leq$ $x$ $\leq$ 1). In the Ce 3$d_{5/2}$ core-level spectra, the variation of satellite structures ($f^2$ peaks) shows that the hybridization strength between Ce 4$f$- and conduction electrons gradually increases with Co concentration in good agreement with the results of Ce 3$d-4f$ and 4$d-4f$ resonant photoemission spectroscopies. Particularly, in Ce 3$d_{3/2}$ core-level spectra, the multiplet structures of $f^1$ peaks systematically change with the degeneracy of $f$-states which originates from crystalline electric field effects.

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