Temperature-dependent high-resolution photoemission study of the Kondo insulator YbB12

被引：63

作者：

Susaki, T ^{[1
]}

Takeda, Y

Arita, M

Mamiya, K

Fujimori, A

Shimada, K

Namatame, H

Taniguchi, M

Shimizu, N

Iga, F

Takabatake, T

机构：

[1] Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan

[2] Hiroshima Univ, Dept Phys Sci, Higashihiroshima 7398526, Japan

[3] High Energy Accelerator Res Org, Photon Factory, Ibaraki, Osaka 3050801, Japan

[4] Hiroshima Univ, Hiroshima Synchrotron Radiat Ctr, Higashihiroshima 7398526, Japan

[5] Hiroshima Univ, ADSM, Dept Quantum Matters, Higashihiroshima 7398526, Japan

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 82卷 / 05期

关键词：

D O I：

10.1103/PhysRevLett.82.992

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have performed a detailed temperature-dependent photoemission study of the conduction-band states in the Kondo insulator YbB12 using single crystalline samples. Measurements with improved energy resolution have revealed (pseudo)gaps of two energy scales. The size of the narrower gap similar to 10 meV and its disappearance at high temperatures are consistent with the temperature dependence of the electrical resistivity and the magnetic susceptibility. The larger pseudogap of similar to 100 meV depends on temperature even at room temperature. We discuss how the characteristics of the Kondo insulator are reflected in the conduction-band photoemission spectra.

引用

页码：992 / 995

页数：4

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