Superconductivity in novel Ge-based skutterudites: {Sr,Ba}pt4Ge12.

Area of Science:

• Solid State Physics
• Materials Science
• Superconductivity

Background:

• Skutterudites are a known class of compounds with diverse physical properties.
• The search for new superconducting materials is crucial for technological advancements.

Purpose of the Study:

• To investigate the superconducting properties of novel skutterudite compounds containing Strontium (Sr) and Barium (Ba).
• To elucidate the mechanism behind the observed superconductivity in these materials.

Main Methods:

• Experimental synthesis and characterization of SrPt4Ge12 and BaPt4Ge12.
• Ab initio theoretical modeling to understand electronic structure and superconductivity.

Main Results:

• SrPt4Ge12 and BaPt4Ge12 were identified as new superconducting skutterudites.
• Superconductivity was observed below critical temperatures (Tc) of 5.35 K for BaPt4Ge12 and 5.10 K for SrPt4Ge12.
• Electron-phonon coupling was identified as the mechanism responsible for superconductivity.

Conclusions:

• Sr and Ba atoms stabilize a novel skutterudite framework composed entirely of Germanium (Ge).
• The electronic structure at the Fermi energy is dominated by Ge-p states, contributing to superconductivity.
• These findings introduce a new class of superconducting skutterudites with potential for further research.