Extreme electron-phonon coupling in boron-based layered superconductors

Document Type

Article

Publication Date

1-1-2002

Abstract

The phonon-mode decomposition of the electron-phonon coupling in the (formula presented) -like system (formula presented) is explored using first-principles calculations. It is found that the high-temperature superconductivity of such systems results from extremely strong coupling up to only (formula presented) of the phonon modes. Noteworthy characteristics of (formula presented) branches include (1) “mode (formula presented) " values of 25 and greater compared to a mean of (formula presented) for other modes, (2) a precipitous Kohn anomaly, and (3) (formula presented) phonon linewidths within a factor of (formula presented) of the frequency itself, indicating impending breakdown of conventional electron-phonon theory. This behavior in borne out by recent inelastic x-ray scattering studies of (formula presented) by Shukla et al. © 2002 The American Physical Society.

Identifier

85038279664 (Scopus)

Publication Title

Physical Review B Condensed Matter and Materials Physics

External Full Text Location

https://doi.org/10.1103/PhysRevB.66.220502

e-ISSN

1550235X

ISSN

10980121

First Page

1

Last Page

4

Issue

22

Volume

66

Grant

0114818

Fund Ref

National Science Foundation

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