Two different types of pseudogaps in high-Tc superconductors

被引：17

作者：

Takahashi, T ^{[1
]}

Sato, T

Yokoya, T

Kamiyama, T

Naitoh, Y

Mochiku, T

Yamada, K

Endoh, Y

Kadowaki, K

机构：

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

[2] Kyoto Univ, Inst Chem Res, Uji 6110011, Japan

[3] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2001年 / 62卷 / 1-2期

基金：

日本科学技术振兴机构; 日本学术振兴会;

关键词：

oxides; photoelectron spectroscopy; superconductivity;

D O I：

10.1016/S0022-3697(00)00098-6

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Ultrahigh-resolution (DeltaE = 7 meV angle-resolved (ARPES) and angle-integrated (AIPES) photoemission spectroscopy have been performed on optimally doped Bi2Sr2CaCu2O8 (Bi2212) and La1.85Sr0.15CuO4 (LSCO). The ARPES spectrum of Bi2212 at the (pi, 0)-(pi, pi) crossing shows a pseudogap at EF above T-c, which is smoothly connected from the superconducting gap across T-c and closes slightly above T-c(T-* = 110 K). On the other hand, the AIPES spectra both in Bi2212 and LSCO show a remarkable depletion of the density of states in a relatively wider energy (100-150 meV) region near EF The temperature-induced filling of the depletion persists far above T-c and T-*. This suggests that there are two different pseudogaps in the high-T-c superconductors: one is likely associated with pairing and the other is attributed to the development of antiferromagnetic correlation. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：41 / 45

页数：5

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