What is it about?
At T > Tc, a conventional superconductor transforms into a metal, in which the resistivity is an increasing function of temperature. In this work, we discovered that under proper scaling of resistivity and temperature, the scaled resistivity can be well-described by a universal function, f(x), which is indepedent of types of compounds, atomic species. and pressure. It is because the resistivity is governed by the electron - optical phonon interaction.
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Why is it important?
It might allow us to extract, for the first time, the logarithmic average frequency from experiments.
Perspectives
The resistivity in metals can be described by Bloch-Gruneisen (BG) formula, if the main scattering mechanism is the electron-phonon interaction. If we use Einstein model for the optical phonons, the BG formula can be written in a simple form. We found that the derived formula can give an excellent description to the resistivity of several famous superhydride compounds, which turn out to be a conventional superconductor at considerably high temperature. There are some parameters in the BG formula. We discovered that one of the parameters, called Einstein frequency, has strong correlation with the logarithmic average frequency (omega log) in Allen-Dynes formula. This knowledge might allow us to extract, for the first time, the logarithmic average frequency from experiments.
Assoc Prof Udomsilp Pinsook
Chulalongkorn University
Read the Original
This page is a summary of: Universal resistivity from electron-phonon interaction based on Einstein model: Application to near-room temperature superconductors, Next Materials, January 2025, Elsevier,
DOI: 10.1016/j.nxmate.2024.100302.
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