Spectral evidence for pseudogap formation in Kondo insulators CeRhAs and CeRhSb

被引：55

作者：

Kumigashira, H ^{[1
]}

Sato, T ^{[1
]}

Yokoya, T ^{[1
]}

Takahashi, T ^{[1
]}

Yoshii, S ^{[1
]}

Kasaya, M ^{[1
]}

机构：

[1] Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 82卷 / 09期

关键词：

D O I：

10.1103/PhysRevLett.82.1943

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

High-resolution photoemission spectroscopy has been performed on CeRhAs and CeRhSb to study the temperature-induced evolution of the "Kondo-insulator" gap. We have observed that a pseudogap opens at E-F at low temperatures while it is gradually filled with increasing temperature. The size of the pseudogap is well scaled with the Kondo temperature (T-K) of each compound while the temperature evolution is dominated by another characteristic temperature T-coh (< T-K) The results are qualitatively consistent with the theoretical prediction from the Anderson lattice model.

引用

页码：1943 / 1946

页数：4

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