Related Experiment Video
Updated: Feb 7, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
Tuning the Electron-Phonon and Superconducting Coupling in InPb Bimetallic Alloys
Ashish C Gandhi1, Sheng Yun Wu1
1Department of Physics , National Dong Hwa University , Hualien 97401 , Taiwan.
Abstract:
Electron-phonon coupling is a fundamental inelastic interaction in solid-state physics and superconductors. Here we probe electron-phonon and superconducting coupling strength by tuning the indium composition in In qPb1- q superconducting bimetallic alloys. A crossover from weak to strong coupling strength was observed through the analysis of crystal structure and superconducting phase diagrams. The hole-doped Pb solid solution showed suppressed TC and subverted coupling strength due to decreased density of state N(0) and hardened phonons, while the electron-doped In solid solution revealed enhanced TC and stronger coupling strength because of increased N(0) and softened phonons. Our results are in agreement with the Ginzburg-Landau theory calculations regarding the dirty limits and are well described by the Allen and Dynes formula within the framework of the McMillan formalism.
Related Concept Videos
Problem-Solving: Tuning of a Guitar String
The string's wave speed can be regulated by varying the linear density. Tension is the other property that determines the speed of...
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
Electron Carriers
Over the many stages of cellular respiration, glucose breaks down into carbon dioxide and water. Electron carriers pick up electrons lost by glucose in these reactions, temporarily storing and releasing them into the electron...
Electron Affinity
G-protein Coupled Receptors

