Electromagnetic properties of impure superconductors with pair-breaking processes
arXiv:1705.04674 · doi:10.1103/PhysRevB.96.014509
Abstract
Recently a generic model has been proposed for the single-particle properties of gapless superconductors with simultaneously present pair-conserving and pair-breaking impurity scattering (the so-called Dynes superconductors). Here we calculate the optical conductivity of the Dynes superconductors. Our approach is applicable for all disorder strengths from the clean up to the dirty limit and for all relative ratios of the two types of scattering, nevertheless the complexity of our description is equivalent to that of the widely used Mattis-Bardeen theory. We identify two optical fingerprints of the Dynes superconductors: (i) the presence of two absorption edges and (ii) a finite absorption at vanishing frequencies even at the lowest temperatures. We demonstrate that the recent anomalous optical data on thin MoN films can be reasonably fitted by our theory.
arXiv comment9 pages, 8 figures, references added, explanation added, typos removed, results unchanged, sent to PRB
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- Thermodynamic properties of the Dynes superconductors
- Design and Performance of Hafnium Optical and Near-IR Kinetic Inductance Detectors
- Tuning microwave losses in superconducting resonators
- Dissipative conductivity of a dirty superconductor with Dynes subgap states under a dc bias current up to the depairing current density
- Superconductivity in LaNiIn
- Quantum dynamics of hydrogen in iron-based superconductor LaFeAsO0.9D0.1 measured with inelastic neutron spectroscopy
- Quasiparticle spectroscopy in technologically-relevant niobium using London penetration depth measurements
- Detailed Analysis of the Superconducting Gap with Dynes Pair-Breaking Scattering
- Onset of superconductor-insulator transition in an ultrathin NbN film under in-plane magnetic field studied by terahertz spectroscopy
- Local Limit Disorder Characteristics of Superconducting Radio Frequency Cavities
- Advanced approach of superconducting gap function extraction from tunneling experiments