Superconductivity in Mo4Ga20As with endohedral gallium clusters

We report the discovery and detailed investigation of superconductivity in Mo4Ga20As. Mo4Ga20As crystallizes in a space group of I4/m (No. 87), with the lattice parameters a = 12.86352 angstrom and c = 5.30031 angstrom. The resistivity, magnetization, and specific heat data reveal Mo4Ga20As to be a type-II superconductor with T (c) = 5.6 K. The upper and lower critical fields are estimated to be 2.78 T and 22.0 mT, respectively. In addition, electron-phonon coupling in Mo4Ga20As is possibly stronger than the BCS weak-coupling limit. First-principles calculations suggest the Fermi level being dominated by the Mo-4d and Ga-4p orbitals.

Automated summary

We report the discovery and investigation of superconductivity in Mo4Ga20As, which crystallizes in the I4/m space group with lattice parameters a = 12.86352 angstrom and c = 5.30031 angstrom. It exhibits type-II superconductivity with a critical temperature of 5.6 K and estimated upper and lower critical fields of 2.78 T and 22.0 mT, respectively. The electron-phonon coupling in Mo4Ga20As is likely stronger than the BCS weak-coupling limit, and first-principles calculations reveal the dominance of Mo-4d and Ga-4p orbitals in the Fermi level.