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

A. Chainani; T. Yokoya; T. Kiss; S. Shin; T. Nishio; H. Uwe

Electron-phonon coupling induced pseudogap and the superconducting transition in Ba_0.67K_0.33BiO₃

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

Research output: Contribution to journal › Article › peer-review

Abstract

We study the single-particle density of states (DOS) across the superconducting transition (T_c=31 K) in single-crystal Ba_0.67K_0.33BiO₃ 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)/k_BT_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 (∼70 meV). The results indicate electron-phonon coupling induces a pseudogap in Ba_0.67K_0.33BiO₃.

Original language	English
Article number	180509
Pages (from-to)	1805091-1805094
Number of pages	4
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	64
Issue number	18
Publication status	Published - Nov 1 2001
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Cite this

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

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.",

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T1 - Electron-phonon coupling induced pseudogap and the superconducting transition in Ba0.67K0.33BiO3

AU - Chainani, A.

AU - Yokoya, T.

AU - Kiss, T.

AU - Shin, S.

AU - Nishio, T.

AU - Uwe, H.

PY - 2001/11/1

Y1 - 2001/11/1

N2 - 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.

AB - 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.

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Electron-phonon coupling induced pseudogap and the superconducting transition in Ba_0.67K_0.33BiO₃

Abstract

ASJC Scopus subject areas

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