Electron-phonon coupling induced pseudogap and the superconducting transition in Ba0.67K0.33BiO3

A. Chainani, Takayoshi Yokoya, T. Kiss, S. Shin, T. Nishio, H. Uwe

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Abstract

We study the single-particle density of states (DOS) across the superconducting transition (Tc=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, Δ(5.3 K) = 5.2 meV and 2Δ(0)/kBTc = 3.9. In addition, we observe a pseudogap below and above Tc, occurring as a suppression in intensity over an energy scale up to the breathing mode phonon (∼70 meV). The results indicate electron-phonon coupling induces a pseudogap in Ba0.67K0.33BiO3.

Original languageEnglish
Article number180509
Pages (from-to)1805091-1805094
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume64
Issue number18
Publication statusPublished - Nov 1 2001
Externally publishedYes

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ASJC Scopus subject areas

  • Condensed Matter Physics

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