Composition dependent polymorphism and superconductivity in Y_3+x{Rh,Ir}₄Ge_13−x

Abstract

Polymorphism is observed in the Y3+xRh4Ge13−x series of superconductors.

Superconductivity of structurally disordered Y5Ir6Sn18

“…R 3 Pt 4 Ge 13 series [22][23][24] ) or modulations (Yb 3 Co 4 Ge 13 25 ) or intergrowth of differently ordered domains at the nano-level, as reported for Y 3+x Rh 4 Ge 13−x . 26 All these result in the shortening of the interatomic distances between the atoms building up the enlarged voids (i.e. an icosahedron in these cases), thus impeding the rattling effect, which is a main feature of a cage compound.…”