Phonon softening in ceramic superconductors

Kosmas Prassides; Matthew J. Rosseinsky; A. JoséDianoux; Peter Day

doi:10.1016/0921-4526(92)90769-O

Phonon softening in ceramic superconductors

Kosmas Prassides, Matthew J. Rosseinsky, A. JoséDianoux, Peter Day

Advanced Institute for Materials Research (AIMR)

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

Abstract

The phonon density-of-states of the ceramic superconductors Ba_0.6K_0.4BiO₃, BaPb_0.75Bi_0.2O₃ and BaPb_0.75Sb_0.25O₃ has been measured by the neutron time-of-flight technique to very low energy transfer. Measurements on metallic BaPbO₃ and semiconducting BaBiO₃ are also reported. Phonon anomalies, associated with high-frequency oxygen breathing modes are observed. The low-frequency region also reveals additional features that vary across the series. The results are consistent with phonon-mediated mechanisms for superconductivity.

Original language	English
Pages (from-to)	393-395
Number of pages	3
Journal	Physica B: Physics of Condensed Matter
Volume	180-181
Issue number	PART 1
DOIs	https://doi.org/10.1016/0921-4526(92)90769-O
Publication status	Published - 1992 Jun 2

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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title = "Phonon softening in ceramic superconductors",

abstract = "The phonon density-of-states of the ceramic superconductors Ba0.6K0.4BiO3, BaPb0.75Bi0.2O3 and BaPb0.75Sb0.25O3 has been measured by the neutron time-of-flight technique to very low energy transfer. Measurements on metallic BaPbO3 and semiconducting BaBiO3 are also reported. Phonon anomalies, associated with high-frequency oxygen breathing modes are observed. The low-frequency region also reveals additional features that vary across the series. The results are consistent with phonon-mediated mechanisms for superconductivity.",

author = "Kosmas Prassides and Rosseinsky, {Matthew J.} and A. Jos{\'e}Dianoux and Peter Day",

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AU - Prassides, Kosmas

AU - Rosseinsky, Matthew J.

AU - JoséDianoux, A.

AU - Day, Peter

PY - 1992/6/2

Y1 - 1992/6/2

N2 - The phonon density-of-states of the ceramic superconductors Ba0.6K0.4BiO3, BaPb0.75Bi0.2O3 and BaPb0.75Sb0.25O3 has been measured by the neutron time-of-flight technique to very low energy transfer. Measurements on metallic BaPbO3 and semiconducting BaBiO3 are also reported. Phonon anomalies, associated with high-frequency oxygen breathing modes are observed. The low-frequency region also reveals additional features that vary across the series. The results are consistent with phonon-mediated mechanisms for superconductivity.

AB - The phonon density-of-states of the ceramic superconductors Ba0.6K0.4BiO3, BaPb0.75Bi0.2O3 and BaPb0.75Sb0.25O3 has been measured by the neutron time-of-flight technique to very low energy transfer. Measurements on metallic BaPbO3 and semiconducting BaBiO3 are also reported. Phonon anomalies, associated with high-frequency oxygen breathing modes are observed. The low-frequency region also reveals additional features that vary across the series. The results are consistent with phonon-mediated mechanisms for superconductivity.

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Phonon softening in ceramic superconductors

Abstract

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