Superfluid density in conventional superconductors: from clean to strongly disordered

Area of Science:

• Condensed Matter Physics
• Superconductivity
• Materials Science

Background:

• Superfluid density is a key property of superconductors.
• Disordered superconductors present unique physical phenomena.
• Existing theoretical models may not fully capture experimental observations.

Purpose of the Study:

• To reformulate the expression for superfluid density in disordered superconductors.
• To compare theoretical predictions with experimental data more accurately.
• To identify limitations in current theoretical approaches.

Main Methods:

• Mathematical reformulation of the superfluid density expression.
• Separation of the 'dirty-limit' term and an additional term.
• Comparison of the new expression with existing experimental data.

Main Results:

• The commonly used 'dirty-limit' term is insufficient for analyzing experimental data.
• A new expression reveals discrepancies with previous analyses.
• The reformulated expression provides a better fit for experimental results.

Conclusions:

• Current theoretical models for disordered superconductors require refinement.
• Further experimental validation is needed for a broader range of disorder levels.
• This work highlights the importance of accurate theoretical descriptions in superconductivity research.