Pseudogap formation in Kondo insulators CeRhSb and CeRhAs studied by ultrahigh-resolution photoemission spectroscopy

被引：5

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：

PHYSICA B-CONDENSED MATTER | 2000年 / 281卷

基金：

日本学术振兴会;

关键词：

CeRhSb; CeRhAs; Kondo insulator; photoemission;

D O I：

10.1016/S0921-4526(99)00827-3

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We report an ultrahigh-resolution (Delta E similar to 8 meV) temperature-dependent photoemission spectroscopy on the Kondo insulators CeRhAs and CeRhSb. We have observed a pseudogap at the Fermi level at low temperature for both compounds, which is gradually filled-in with increasing temperature. We found that, the, size of pseudogap is well scaled with the Kondo temperature (T-K) while the temperature evolution is dominated by another characteristic temperature much lower than T-K. (C) 2000 Published by Elsevier Science B.V. All rights reserved.

引用

页码：284 / 285

页数：2

共 7 条

[1]

Aeppli G., 1992, Comments Condens. Matter Phys., V16, P155

[2] Photoemission study of the Kondo insulator Ce3Bi4Pt3 [J].

Breuer, K ;

Messerli, S ;

Purdie, D ;

Garnier, M ;

Hengsberger, M ;

Panaccione, G ;

Baer, Y ;

Takahashi, T ;

Yoshii, S ;

Kasaya, M ;

Katoh, K ;

Takabatake, T .

EUROPHYSICS LETTERS, 1998, 41 (05) :565-570

[3] Temperature-dependent band structure of the Kondo insulator [J].

Grober, C ;

Eder, R .

PHYSICAL REVIEW B, 1998, 57 (20) :R12659-R12662

[4] Transfer of spectral weight in spectroscopies of correlated electron systems [J].

Rozenberg, MJ ;

Kotliar, G ;

Kajueter, H .

PHYSICAL REVIEW B, 1996, 54 (12) :8452-8468

[5] Low-energy electronic structure of the Kondo insulator YbB12 [J].

Susaki, T ;

Sekiyama, A ;

Kobayashi, K ;

Mizokawa, T ;

Fujimori, A ;

Tsunekawa, M ;

Muro, T ;

Matsushita, T ;

Suga, S ;

Ishii, H ;

Hanyu, T ;

Kimura, A ;

Namatame, H ;

Taniguchi, M ;

Miyahara, T ;

Iga, F ;

Kasaya, M ;

Harima, H .

PHYSICAL REVIEW LETTERS, 1996, 77 (20) :4269-4272

[6] Ce- and Yb-based Kondo semiconductors [J].

Takabatake, T ;

Iga, F ;

Yoshino, T ;

Echizen, Y ;

Katoh, K ;

Kobayashi, K ;

Higa, M ;

Shimizu, N ;

Bando, Y ;

Nakamoto, G ;

Fujii, H ;

Izawa, K ;

Suzuki, T ;

Fujita, T ;

Sera, M ;

Hiroi, M ;

Maezawa, K ;

Mock, S ;

Von Lohneysen, H ;

Bruckl, A ;

Neumaier, K ;

Andres, K .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1998, 177 :277-282

[7] Effect of pressure on the size of energy gap in semiconducting mixed-valent rare-earth compounds [J].

Yoshii, S ;

Kasaya, M ;

Takahashi, H ;

Mori, N .

PHYSICA B-CONDENSED MATTER, 1996, 223-24 (1-4) :421-425

← 1 →