Single 20meV boson mode in KFe2As2 detected by point-contact spectroscopy

Yu. G. Naidyuk; O. E. Kvitnitskaya; N. V. Gamayunova; L. Boeri; S. Aswartham; S. Wurmehl; B. Büchner; D. V. Efremov; G. Fuchs; S. -L. Drechsler

doi:10.1103/PhysRevB.90.094505

Single 20meV boson mode in KFe2As2 detected by point-contact spectroscopy

Superconductivity 2015-11-12 v1

Authors: Yu. G. Naidyuk , O. E. Kvitnitskaya , N. V. Gamayunova , L. Boeri , S. Aswartham , S. Wurmehl , B. Büchner , D. V. Efremov , G. Fuchs , S. -L. Drechsler

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Abstract

We report an experimental and theoretical investigation of the electron-boson interaction in KFe2As2 by point-contact (PC) spectroscopy, model, and ab-initio LDA-based calculations for the standard electron-phonon Eliashberg function. The PC spectrum viz. the second derivative of the I - V characteristic of representative PC exhibits a pronounced maximum at about 20meV and surprisingly a featureless behavior at lower and higher energies. We discuss phonon and non-phonon (excitonic) mechanisms for the origin of this peak. Analysis of the underlying source of this peak may be important for the understanding of serious puzzles of superconductivity in this type of compounds.

Keywords

point-contact spectroscopy KFe2As2 electron-boson interaction Eliashberg function boson mode superconductivity

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@article{arxiv.1408.1509,
  title  = {Single 20meV boson mode in KFe2As2 detected by point-contact spectroscopy},
  author = {Yu. G. Naidyuk and O. E. Kvitnitskaya and N. V. Gamayunova and L. Boeri and S. Aswartham and S. Wurmehl and B. Büchner and D. V. Efremov and G. Fuchs and S. -L. Drechsler},
  journal= {arXiv preprint arXiv:1408.1509},
  year   = {2015}
}

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10 pages, 6 figs., to be published in PRB

Single 20meV boson mode in KFe2As2 detected by point-contact spectroscopy

Abstract

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