Phonon Dispersion Relationship and Oxygen Isotope Effect in Superconductor LaFeAsO
Myong Chol Pak, Chol Won Ri, Hak Chol Pak, Kum Hyok Jong
TL;DR
This study calculates the phonon dispersion in LaFeAsO and explores how phonons influence the oxygen isotope effect, aligning with experimental observations of a small isotope effect power index.
Contribution
It provides the first ab initio calculation of phonon dispersion in LaFeAsO and links phonons to the oxygen isotope effect in this superconductor.
Findings
Phonon dispersion relationship calculated for LaFeAsO.
Oxygen isotope effect is primarily connected with phonons.
Results agree with experimental data showing a small isotope effect index.
Abstract
In this paper we calculate ab initially the phonon dispersion relationship of the superconductor LaFeAsO and investigate a main property in the superconductor, the oxygen isotope effect. Based on this phonon dispersion relationship, we find the fact that an important reason of the oxygen isotope effect is connected with the phonon. This result agrees well with the experimental data where the power index of the oxygen isotope effect in the superconductor LaFeAsO is small.
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