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Two-gap superconductivity in Ag1-x Mo6S8 Chevrel phase
Manuel Feig1,2, Matej Bobnar2, Igor Veremchuk2
1Institut für Experimentelle Physik, TU Bergakademie Freiberg, Leipziger Straße 23, 09596 Freiberg, Germany.
Summary
This study investigates the superconducting properties of the Chevrel phase Mo6S8, revealing it as a two-band superconductor. Researchers determined critical magnetic fields and electronic specific heat, offering new insights into its superconductivity.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Superconductivity
Background:
- Chevrel phases, such as Mo6S8, are known for their unique superconducting properties.
- Understanding the fundamental mechanisms governing superconductivity in these materials is crucial for developing new superconducting technologies.
Purpose of the Study:
- To comprehensively investigate the superconducting properties of Mo6S8.
- To determine the critical magnetic fields and electronic structure of this Chevrel phase superconductor.
Main Methods:
- Spark plasma sintering was used to prepare the Mo6S8 sample.
- Magnetization and electrical resistivity measurements were performed to determine critical magnetic fields.
- Low-temperature electronic specific heat analysis was conducted.
- Density Functional Theory (DFT) calculations were employed to study electron-phonon coupling and electronic structure.
Main Results:
- The lower and upper critical magnetic fields of Mo6S8 were determined for the first time.
- Analysis revealed Mo6S8 as a two-band superconductor with distinct energy gaps.
- DFT calculations indicated stronger electron-phonon coupling than previously reported.
- The Fermi surface was found to consist of two hole-like and one electron-like band, similar to MgB2.
Conclusions:
- Mo6S8 exhibits complex two-band superconductivity with significant electron-phonon coupling.
- The determined critical fields and electronic structure provide valuable data for understanding and potentially enhancing its superconducting performance.
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