Electron-phonon coupling in superconducting Ba0.6K0.4BiO3: A Raman scattering study

K. F. McCarty; H. B. Radousky; D. G. Hinks; Y. Zheng; A. W. Mitchell; T. J. Folkerts; R. N. Shelton

doi:10.1103/PhysRevB.40.2662

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Electron-phonon coupling in superconducting Ba0.6K0.4BiO3: A Raman scattering study

K. F. McCarty, H. B. Radousky, D. G. Hinks, Y. Zheng, A. W. Mitchell, T. J. Folkerts, R. N. Shelton

DOI 10.1103/PhysRevB.40.2662 · Physical Review B

T1

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Abstract

Superconducting and nonsuperconducting phases in the Ba1−xKxBiO3 system have been studied at temperatures down to 4 K by use of Raman spectroscopy. For superconducting Ba0.6K0.4BiO3, an optical phonon at 348 cm−1 (43 meV) has the distinctive Fano line shape indicative of significnat coupling between the phonon and a broad electronic continuum. For nonsuperconducting Ba0.8K0.2BiO3, the same phonon is not observed to be coupled to the electronic states. Assignment of the 348-cm−1 peak to specific normal modes of vibration is discussed as is the similarity to the phonon at 340 cm−1 in YBa2Cu3O7 that also exhibits electron-phonon coupling.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Ba0.6K0.4BiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	24	Pressure not reported	onset
Ba1-xKxBiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	28	Pressure not reported	onset
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown