Bulk-sensitive photoemission study of A Cu3 Ru4 O12 (A=Ca, Na, and La) with heavy-fermion behavior
Bulk-sensitive photoemission study of A Cu3 Ru4 O12 (A=Ca, Na, and La) with heavy-fermion behavior
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DOI：
10.1103/physrevb.80.075113
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发表时间：
2009-08
影响因子：
3.7
通讯作者：
T. Sudayama;Y. Wakisaka;K. Takubo;T. Mizokawa;W. Kobayashi;I. Terasaki;S. Tanaka;Y. Maeno;M. Arita;H. Namatame;M. Taniguchi
中科院分区：
文献类型：
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作者：
T. Sudayama;Y. Wakisaka;K. Takubo;T. Mizokawa;W. Kobayashi;I. Terasaki;S. Tanaka;Y. Maeno;M. Arita;H. Namatame;M. Taniguchi
我们已经研究了电子重费米子态（，钠，和La）使用X射线光电子能谱和高分辨率光电子能谱在体敏感光子能量（7 eV）。体敏感的光电子能谱测量，钠，和La的pseudogap内的共振结构通常演变在低温范围内的Kadowaki-Woods关系。类共振峰和重费米子行为的起源基本上归因于和轨道间的杂化。位点的替换控制着杂交带的填充。有趣的是，虽然类共振峰的位置大致遵循的刚性带移动为和La，共振峰偏离刚性带的行为是位于费米能级的Kondo系统中的预期。费米能级附近的类共振峰的差异与核能级谱的差异有关。
We have studied the-electron heavy-fermion states in(, Na, and La) using x-ray photoemission spectroscopy and high-resolution photoemission spectroscopy at bulk-sensitive photon energy (7 eV). The bulk-sensitive photoemission measurements for, Na, and La show that a resonancelike structure within a pseudogap commonly evolves in the low-temperature range where the Kadowaki-Woods relation holds. The origin of the resonancelike peak and the heavy-fermion behavior is basically attributed to the hybridization between theandorbitals. The-site substitution controls the filling of theandhybridized bands. Interestingly, while the resonancelike peak position roughly follows the rigid-band shift forand La, the resonancelike peak deviating from the rigid-band behavior is located just at the Fermi level as expected in a Kondo system. The difference in the resonancelike peak near the Fermi level is correlated with that in thecore-level spectra.