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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.
Scientific Reports
|September 21, 2019
Summary
This study investigates two-gap superconductivity in Mo8Ga41 using thermodynamic and spectroscopic methods. Results reveal only one intrinsic superconducting gap, challenging previous multigap theories.
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.
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