Energy-Dependent Enhancement of the Electron-Coupling Spectrum of the Underdoped Bi2Sr2CaCu2O8+δ Superconductor

被引：37

作者：

Anzai, H. ^{[1
]}

Ino, A. ^{[1
]}

Kamo, T. ^{[1
]}

Fujita, T. ^{[1
]}

Arita, M. ^{[2
]}

Namatame, H. ^{[2
]}

Taniguchi, M. ^{[1
,2
]}

Fujimori, A. ^{[3
]}

Shen, Z. -X. ^{[4
,5
]}

Ishikado, M. ^{[3
]}

Uchida, S. ^{[3
]}

机构：

[1] Hiroshima Univ, Grad Sch Sci, Higashihiroshima 7398526, Japan

[2] Hiroshima Univ, Hiroshima Synchrotron Radiat Ctr, Higashihiroshima 7390046, Japan

[3] Univ Tokyo, Dept Phys, Tokyo 1130033, Japan

[4] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

[5] Stanford Univ, Stanford Synchrotron Radiat Lab, Stanford, CA 94305 USA

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 22期

关键词：

HIGH-TEMPERATURE SUPERCONDUCTORS; INSULATOR TRANSITIONS; STATE;

D O I：

10.1103/PhysRevLett.105.227002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have determined the electron-coupling spectrum of superconducting Bi2Sr2CaCu2O8+delta from high-resolution angle-resolved photoemission spectra by two deconvolution-free robust methods. As hole concentration decreases, the coupling spectral weight at low energies less than or similar to 15 meV shows a twofold and nearly band-independent enhancement, while that around similar to 65 meV increases moderately, and that in greater than or similar to 130 meV decreases leading to a crossover of dominant coupling excitation between them. Our results suggest the competition among multiple screening effects, and provide important clues to the source of sufficiently strong low-energy coupling, lambda(LE) approximate to 1, in an underdoped system.

引用

页数：4

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