Project supported by the National Natural Science Foundation of China(Grant No.50902119)
Single-crystal samples of type-VIII BasGa16-xCuxSn30 (x = 0, 0.03, 0.06, 0.15) clathrates were prepared using the Sn-flux method. At room temperature the carrier density, n, is 3.5-5 × 10^19 cm^-3 for all the sampl...