Anomalous Fermi-surface dependent pairing in a self-doped high-Tc superconductor

被引：39

作者：

Chen, Yulin ^{[1
]}

Iyo, Akira

Yang, Wanli

Zhou, Xingjiang

Lu, Donghui

Eisaki, Hiroshi

Devereaux, Thomas P.

Hussain, Zahid

Shen, Z. -X.

机构：

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

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

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

[4] Univ Waterloo, Dept Phys, Waterloo, ON N2L 3G1, Canada

[5] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 23期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.97.236401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the discovery of a self-doped multilayer high T-c superconductor Ba2Ca3Cu4O8F2 (F0234) which contains distinctly different superconducting gap magnitudes along its two Fermi-surface sheets. While formal valence counting would imply this material to be an undoped insulator, it is a self-doped superconductor with a T-c of 60 K, possessing simultaneously both electron- and hole-doped Fermi-surface sheets. Intriguingly, the Fermi-surface sheet characterized by the much larger gap is the electron-doped one, which has a shape disfavoring two electronic features considered to be important for the pairing mechanism: the van Hove singularity and the antiferromagnetic (pi/a, pi/a) scattering.

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页数：4

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