Revealing uncommon transport in the previously unascertained very low cation clathrate-I Eu2Ga11Sn35†
Abstract
High occupancy of cation sites is typical for clathrate-I compositions allowing limited tunability of the electrical properties beyond doping and elemental substitution. Herein, we report on the structure and electrical transport of single-crystal Eu2Ga11Sn35, the sole example of a very low (25%) cation concentration clathrate-I material with atypical transport directly attributable to the structure and stoichiometry.