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Fluctuation-driven superconductivity in nitrogen-doped disordered tungsten-rhenium films.
Abhishek Kumar1,2, F Colangelo1,2, F Avitabile1
1Dipartimento di Fisica "E.R. Caianiello", Università degli Studi di Salerno, I-84084 Fisciano, SA, Italy. abkumar@unisa.it.
Nanoscale
|June 22, 2026
Summary
Nitrogen-doped tungsten-rhenium (WReN) thin films reveal how disorder influences quantum transport and superconductivity. This study explores superconducting fluctuations, quantum fluctuations, and weak localization in WReN for advanced material applications.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Phenomena
Background:
- Superconducting materials are crucial for technological advancements.
- Understanding the role of disorder in superconductivity is key to optimizing material properties.
- Tungsten-rhenium alloys offer tunable superconducting characteristics.
Purpose of the Study:
- To systematically investigate nitrogen-doped tungsten-rhenium (WReN) thin films.
- To explore the interplay of disorder, superconducting fluctuations (SFs), quantum fluctuations (QFs), and weak localization (WL).
- To establish WReN as a platform for studying quantum transport phenomena.
Main Methods:
- Fabrication of WReN thin films with varying thicknesses (5-60 nm).
- Utilized Hall effect, magnetoresistance, and magnetoconductivity (MC) measurements.
- Analyzed SF, WL, and QF effects to determine superconducting parameters and relaxation times.
Main Results:
- Nitrogen doping allows fine-tuning of disorder in WReN films.
- Identified key superconducting parameters like critical temperature and coherence length.
- Extracted relaxation times of the order of picoseconds from MC analyses.
- Demonstrated the significant impact of disorder on quantum transport and superconducting behavior.
Conclusions:
- Disorder plays a critical role in dictating both quantum transport and superconducting properties of WReN films.
- WReN is a promising material for exploring quantum transport and developing superconducting devices.
- The findings provide a foundation for future research in quantum materials.
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