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

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

doi:10.1103/PhysRevB.90.094505

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

Yu. G. Naidyuk, O. E. Kvitnitskaya, N. V. Gamayunova, Lilia Boeri, S. Aswartham, S. Wurmehl, B. Buchner, D.V. Efremov, Guenter Fuchs, S-L Drechsler

Institute of Theoretical and Computational Physics (5150)

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

Abstract

We report an experimental and theoretical investigation of the electron-boson interaction in KFe2As2 by point-contact (PC) spectroscopy, model, and ab initio local density approximation–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 20 meV and surprisingly a featureless behavior at lower and higher energies. We discuss phonon and nonphonon (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 compound.

Original language	English
Article number	094505
Journal	Physical Review B
Volume	90
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevB.90.094505
Publication status	Published - 2014

Fields of Expertise

Advanced Materials Science

Treatment code (Nähere Zuordnung)

Basic - Fundamental (Grundlagenforschung)
Theoretical

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10.1103/PhysRevB.90.094505

Cite this

@article{88c81387540c44548239a8876c0ef5bf,

title = "Single 20 meV boson mode in KFe2As2 detected by point-contact spectroscopy",

abstract = "We report an experimental and theoretical investigation of the electron-boson interaction in KFe2As2 by point-contact (PC) spectroscopy, model, and ab initio local density approximation–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 20 meV and surprisingly a featureless behavior at lower and higher energies. We discuss phonon and nonphonon (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 compound.",

author = "Naidyuk, {Yu. G.} and Kvitnitskaya, {O. E.} and Gamayunova, {N. V.} and Lilia Boeri and S. Aswartham and S. Wurmehl and B. Buchner and D.V. Efremov and Guenter Fuchs and S-L Drechsler",

year = "2014",

doi = "10.1103/PhysRevB.90.094505",

language = "English",

volume = "90",

journal = "Physical Review B",

issn = "2469-9969",

publisher = "American Physical Society",

number = "9",

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TY - JOUR

T1 - Single 20 meV boson mode in KFe2As2 detected by point-contact spectroscopy

AU - Naidyuk, Yu. G.

AU - Kvitnitskaya, O. E.

AU - Gamayunova, N. V.

AU - Boeri, Lilia

AU - Aswartham, S.

AU - Wurmehl, S.

AU - Buchner, B.

AU - Efremov, D.V.

AU - Fuchs, Guenter

AU - Drechsler, S-L

PY - 2014

Y1 - 2014

N2 - We report an experimental and theoretical investigation of the electron-boson interaction in KFe2As2 by point-contact (PC) spectroscopy, model, and ab initio local density approximation–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 20 meV and surprisingly a featureless behavior at lower and higher energies. We discuss phonon and nonphonon (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 compound.

AB - We report an experimental and theoretical investigation of the electron-boson interaction in KFe2As2 by point-contact (PC) spectroscopy, model, and ab initio local density approximation–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 20 meV and surprisingly a featureless behavior at lower and higher energies. We discuss phonon and nonphonon (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 compound.

U2 - 10.1103/PhysRevB.90.094505

DO - 10.1103/PhysRevB.90.094505

M3 - Article

SN - 2469-9969

SN - 1550-235X

VL - 90

JO - Physical Review B

JF - Physical Review B

IS - 9

M1 - 094505

ER -

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

Abstract

Fields of Expertise

Treatment code (Nähere Zuordnung)

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