Electron-phonon coupling induced pseudogap and the superconducting transition in Ba0.67K0.33BiO3 -: art. no. 180509

被引：22

作者：

Chainani, A ^{[1
]}

Yokoya, T

Kiss, T

Shin, S

Nishio, T

Uwe, H

机构：

[1] Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan

[2] Inst Plasma Res, Gandhi Sagar 382428, India

[3] RIKEN, Inst Phys & Chem Res, Kobe, Hyogo 6795143, Japan

[4] Univ Tsukuba, Inst Mat Sci, Tsukuba, Ibaraki 3058573, Japan

来源：

PHYSICAL REVIEW B | 2001年 / 64卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.64.180509

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study the single-particle density of states (DOS) across the superconducting transition (T-c = 31 K) in single-crystal Ba0.67K0.33BiO3 using ultrahigh resolution angle-integrated photoemission spectroscopy. The superconducting gap opens with a pileup in the DOS, Delta (5.3 K) = 5.2 meV and 2 Delta (0)/k(B)T(c) = 3.9. In addition, we observe a pseudogap below and above T-c occurring as a suppression in intensity over an energy scale up to the breathing mode phonon (similar to 70 meV). The results indicate electron-phonon coupling induces a pseudogap in Ba0.67K0.33BiO3.

引用

页数：4

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