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Universal Scaling Relations in Electron-Phonon Superconductors.
Joshuah T Heath1, Rufus Boyack1
1Dartmouth College, Department of Physics and Astronomy, Hanover, New Hampshire 03755, USA.
Physical Review Letters
|June 18, 2025
Summary
Homes scaling relations link superfluid density and conductivity in electron-phonon superconductors. This fundamental finding applies broadly, extending beyond cuprate or BCS theories.
Area of Science:
- Condensed matter physics
- Superconductivity research
Background:
- Electron-phonon interactions are crucial for superconductivity.
- Linear scaling relations offer insights into material properties.
Purpose of the Study:
- Investigate linear scaling relations in electron-phonon superconductors.
- Determine the universality of Homes scaling in these materials.
Main Methods:
- Combined numerical and analytical techniques.
- Analysis of zero-temperature superfluid density.
- Examination of normal-state dc conductivity.
Main Results:
- Identified linear Homes scaling relations.
- Established a link between superfluid density and dc conductivity.
- Demonstrated universality across various scattering mechanisms (impurity, inelastic electron-phonon).
Conclusions:
- Homes scaling is a fundamental property in a wide range of superconductors.
- This phenomenon is more universal than previously thought, surpassing cuprate or BCS-like physics.
- The findings broaden the understanding of superconductivity mechanisms.
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