Angle-resolved photoemission study of superconducting ladder compound Sr14-xCaxCu24O41

被引：6

作者：

Sato, T

Yokoya, T

Takahashi, T ^{[1
]}

Uehara, M

Nagata, T

Goto, J

Akimitsu, J

机构：

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

[2] Aoyama Gakuin Univ, Dept Phys, Setagaya Ku, Tokyo 1570071, Japan

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 1998年 / 59卷 / 10-12期

基金：

日本学术振兴会;

关键词：

ladder compound; Sr14CaxCu24O4; angle-resolved photoemission; band structure; Mott-Hubbard gap;

D O I：

10.1016/S0022-3697(98)00148-6

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Angle-resolved photoemission spectroscopy has been performed on Sr14-xCaxCu24O41 (x = 0-11.5) which consists of two-leg Cu2O3 ladders and edge-sharing CuO2 chains. A dispersive band with the periodicity of ladder sublattice is observed near the Fermi level (E-F) for x = 0. The band shows a minimum binding energy at ka = (2n + 1)pi/2, suggesting that a Mott-Hubbard gap opens on the ladder. This indicates that copper atoms on the ladder take essentially the divalent state (Cu2+) and a majority of self-duped holes reside on the chain. We Found that the Ca substitution causes a transfer of holes from the chain to the ladder. (C) 1998 Elsevier Science Ltd. All rights reserved.

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页码：1912 / 1916

页数：5

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