Angle-resolved and resonant photoemission spectroscopy on heavy-fermion superconductors Ce2CoIn8 and Ce2RhIn8
Angle-resolved and resonant photoemission spectroscopy on heavy-fermion superconductors Ce2CoIn8 and Ce2RhIn8
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DOI：
10.1103/physrevb.71.224516
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发表时间：
2005-06
影响因子：
3.7
通讯作者：
S. Raj;Y. Iida;S. Souma;Takafumi Sato;T. Takahashi;H. Ding;S. Ōhara;T. Hayakawa;Genfu Chen;I. Sakamoto;H. Harima
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文献类型：
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作者：
S. Raj;Y. Iida;S. Souma;Takafumi Sato;T. Takahashi;H. Ding;S. Ōhara;T. Hayakawa;Genfu Chen;I. Sakamoto;H. Harima
我们对重费米子超导体Ce2CoIn8和Ce2RhIn8进行了高分辨角分辨和共振光电子能谱（RPES）研究，研究了Ce4f电子的能带结构和性质.我们已经通过实验确定了价带结构，并与全势线性增广平面波带的计算结果进行了比较。我们发现这两种化合物都具有以布里渊区M（A）点为中心的准二维圆柱费米面，这可能是超导电性发展的一个重要参数。与基于巡回和本地化模型的能带计算的比较表明，在40 K的测量温度下，Ce 4f电子基本上在两种化合物中本地化。RPES结果证实了Ce 4f电子在两种化合物中的局域化特征，Ce2RhIn8中的局域化性质比Ce2CoIn8中的局域化性质相对较强。局域化特征强度的这种差异很好地解释了两种化合物之间磁性的差异。
We have carried out high-resolution angle-resolved and resonant photoemission spectroscopy (RPES) on heavy-fermion superconductors Ce2CoIn8 and Ce2RhIn8 to study the electronic band structure and the nature of the Ce 4f electrons. We have experimentally determined the valence-band structure and compared them with the full-potential linear augmented plane-wave band calculations. We found that both compounds have quasi-two-dimensional cylindrical Fermi surfaces centered at the M(A) point in the Brillouin zone, which may be an essential parameter for the development of the superconductivity. Comparison with the band calculations based on the itinerant and localized models suggests that the Ce 4f electrons are essentially localized in both compounds at a measured temperature of 40 K. RPES results have confirmed the localized character of the Ce 4f electrons in both compounds, with a relatively stronger localized nature in Ce2RhIn8 than in Ce2CoIn8. This difference in the strength of localized character well explains the difference in the magnetic properties between the two compounds.