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Upper critical fields in normal metal-superconductor-normal metal trilayers.
Kelsey B Robbins1, Pukar Sedai1, Alexandra J Howzen1
1Department of Physics, Texas State University, San Marcos, TX, 78666, USA.
Scientific Reports
|April 16, 2025
Summary
Spin-orbit interaction in superconductor-normal metal systems was studied. Higher resistivity metals showed 2D superconducting behavior, with critical temperature suppression observed in all trilayers.
Area of Science:
- Condensed Matter Physics
- Superconductivity
- Spintronics
Background:
- Spin-orbit interaction is crucial for understanding superconducting proximity effects.
- Research explores its role in generating spin-triplet correlations.
Purpose of the Study:
- Investigate the influence of spin-orbit interaction and resistivity on the normal metal proximity effect.
- Experimentally survey Nb-based trilayers with various normal metals.
Main Methods:
- Fabrication of thin normal metal-superconductor-normal metal (N-S-N) trilayers.
- Experimental measurements of upper critical fields.
- Utilized Nb superconductor with Al, Ti, Cu, Pt, Ta, and Au normal metals.
Main Results:
- Trilayer upper critical fields were lower than single Nb layers.
- Higher resistivity trilayers (Ti, Pt, Ta) exhibited 2D superconducting behavior.
- All trilayers showed greater critical temperature suppression under magnetic field rotation.
Conclusions:
- Resistivity and spin-orbit interaction significantly impact normal metal proximity effects.
- Observed phenomena are attributed to conventional orbital screening, not colossal spin valve effects.
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