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Single-gap superconductivity in Mo8Ga41.

Miroslav Marcin1, Jozef Kačmarčík1, Zuzana Pribulová2

  • 1Centre of Low Temperature Physics, Institute of Experimental Physics SAS, and Faculty of Science, P. J. Šafárik University, 040 01, Košice, Slovakia.

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This study investigates two-gap superconductivity in Mo8Ga41 using thermodynamic and spectroscopic methods. Results reveal only one intrinsic superconducting gap, challenging previous multigap theories.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Superconductivity in molybdenum gallium compounds is of significant interest.
  • Recent studies suggested Mo8Ga41 exhibits two-gap superconductivity.
  • Understanding the electronic structure of superconductors is crucial for technological applications.

Purpose of the Study:

  • To investigate the potential for two-gap superconductivity in Mo8Ga41.
  • To clarify the intrinsic superconducting properties of Mo8Ga41.
  • To reconcile conflicting findings regarding the superconducting gaps in Mo8Ga41.

Main Methods:

  • Utilized a combination of bulk and surface sensitive probes.
  • Employed ac-calorimetry for thermodynamic measurements.
  • Performed scanning tunneling spectroscopy (STS) on the same crystal.

Main Results:

  • Revealed the presence of only one intrinsic superconducting gap in Mo8Ga41.
  • Observed strong electron-phonon coupling contributing to superconductivity.
  • Detected minute traces of additional superconducting phases that could be mistaken for multigap behavior.

Conclusions:

  • The intrinsic superconductivity of Mo8Ga41 is characterized by a single gap.
  • Previous suggestions of multigap superconductivity may stem from secondary phases.
  • This work provides a more accurate understanding of Mo8Ga41's superconducting properties.