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Summary
This summary is machine-generated.

Researchers tuned interband coupling in lead (Pb) superconductors, revealing how to control multiple superconducting gaps. This work offers insights into multiband superconductivity and its quantum effects.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Most superconductors exhibit multiband superconductivity, but are often described by single-band theories due to strong interband coupling.
  • The complex physics of multiband superconductivity remains experimentally challenging to study.

Purpose of the Study:

  • To experimentally investigate and control the interband coupling in a clean limit multiband superconductor.
  • To demonstrate the modification of superconducting order parameters by tuning interband coupling.

Main Methods:

  • Utilized millikelvin scanning tunneling microscopy to study stacking fault tetrahedra in lead (Pb).
  • Locally tuned interband coupling strength from weak to strong.

Main Results:

  • Observed the transition of superconducting order parameters from two distinct gaps to a single merged gap.
  • Demonstrated local control over interband coupling in a clean limit system.

Conclusions:

  • The experiments provide a critical test for theories of multiband superconductivity.
  • Offers a pathway to explore predicted quantum effects in multiband superconductors.