Electronic structure of K0.5CoO2 studied by angle-resolved photoemission spectroscopy

被引：2

作者：

Usui, H. ^{[1
]}

Iwasawa, H. ^{[1
]}

Hirose, M. ^{[1
]}

Maeda, Y. ^{[1
]}

Saitoh, T. ^{[1
]}

Osada, H. ^{[2
]}

Kyomen, T. ^{[2
]}

Hanaya, M. ^{[2
]}

Aiura, Y. ^{[3
]}

Kotani, Y. ^{[4
,5
]}

Kubota, M. ^{[5
]}

Ono, K. ^{[5
]}

机构：

[1] Tokyo Univ Sci, Dept Appl Phys, Shinjuku Ku, Tokyo 1620861, Japan

[2] Gumma Univ, Dept Chem & Chem Biol, Grad Sch Engn, Kiryu, Gunma 3768515, Japan

[3] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan

[4] Grad Univ Adv Studies, Dept Mat Struct Sci, Tsukuba, Ibaraki 3050801, Japan

[5] KEK, Inst Mat Struct Sci, Tsukuba, Ibaraki 3050801, Japan

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2010年 / 470卷

关键词：

K0.5CoO2; Electronic structure; Angle-resolved photoemission;

D O I：

10.1016/j.physc.2009.10.027

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have investigated the electronic structure of K0.5CoO2 in the metallic phase by high-resolution angle-resolved photoemission spectroscopy at a low temperature. An observed Fermi surface of K0.5CoO2 was a large hexagonal one around the Gamma point only, with no hole pockets on the Gamma-K lines which was typically predicted by band-structure calculations with local-density approximation (LDA). We also found that a modulation of the Fermi velocity, which was the largest at K point and the smallest at M point, was again opposite to the prediction by LDA band-theory. In spite of this conflicting with LDA band-theory, our results are both in agreement with what was observed in NaxCoO2. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：S758 / S759

页数：2

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