We discovered that the new germanide superconductors of A 8(Al,Ge)46 (A = Rb, Cs). A8(Al,Ge)46 have the type-I clathrate type structure (cubic, space group: Pm3̄n (No. 223)). The superconducting transition temperature is confirmed at around 3.6 K for Rb8(Al0.4Ge0.6)46 and 4 K for Cs8(Al0.4Ge0.6)46, respectively. The lattice constants of these compounds are estimated to be a = 1.082(6) nm for Rb8(Al0.4Ge0.6)46 and a = 1.087(8) nm for Cs8(Al0.4Ge0.6)46. The M-H curve at 1.8 K shows that the Rb8(Al0.4Ge 0.6)46 is categorized to be a conventional type-II superconductor. The superconducting parameters of Rb8(Al 0.4Ge0.6)46 are determined using the thermodynamic data and Ginzburg-Landau relations.
- Type-I clathrate type structure
ASJC Scopus subject areas
- Condensed Matter Physics
- Electrical and Electronic Engineering
- Energy Engineering and Power Technology
- Electronic, Optical and Magnetic Materials