Experimental evidence for the p-d hybridization in the Cd-Ca quasicrystal: origin of the pseudogap.
Experimental evidence for the p-d hybridization in the Cd-Ca quasicrystal: origin of the pseudogap.
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DOI：
10.1103/physrevlett.92.146402
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发表时间：
2004-04
影响因子：
8.6
通讯作者：
Ryuji Tamura;T. Takeuchi;C. Aoki;Shin Takeuchi;T. Kiss;T. Yokoya;S. Shin
中科院分区：
文献类型：
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作者：
Ryuji Tamura;T. Takeuchi;C. Aoki;Shin Takeuchi;T. Kiss;T. Yokoya;S. Shin
Cd 6Ca晶体近似物的Ca 2 p-3d共振光电子能谱明确地表明，钙的低位未占据的3d能级通过形成近似物而降低到费米能以下，如电子结构计算所建议的[Phys.Rev.Lett. 87，206408（2001）]]。此外，在费米能级附近得到的Ca 3d偏态密度（DOS）是在合理的协议与理论Ca 3d DOS。这些结果证实了Cd基准晶中赝能隙的起源是由于Ca 3d带与Cd 5 p带的杂化的非常规观点。
Ca 2p-3d resonant photoemission spectroscopy of a Cd6Ca crystalline approximant unambiguously demonstrates that the low-lying unoccupied 3d levels of calcium are lowered below the Fermi energy by the formation of the approximant, as suggested from electronic structure calculations [Phys. Rev. Lett. 87, 206408 (2001)]]. Moreover, the Ca 3d partial density of states (DOS) obtained near the Fermi energy is in reasonable agreement with theoretical Ca 3d DOS. These results verify the unconventional picture that the origin of the pseudogap in the Cd-based quasicrystals is due to hybridization of the Ca 3d band with the Cd 5p band.