NMR studies of silicon clathrate compounds

Maniwa Y; Sakamoto H; Tou H; Aoki Y; Sato H; Shimizu F; Kawaji H; Yamanaka S

Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, Vol.341, 1301-1306, 2000

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NMR studies of silicon clathrate compounds

Maniwa Y, Sakamoto H, Tou H, Aoki Y, Sato H, Shimizu F, Kawaji H, Yamanaka S

NMR spectra. of Si-29 and Ba-137 in silicon clathrate compounds, NaxBaySi46, NaxSi136 and Ba8TxSi46 (where T = Au, Ag, and Cu) are reported. We found that the local density of states at the Fermi level increases with rising superconducting transition temperature. The silicon S1 site was suggested to hybridize with Ba-orbital in the superconducting clathrate and has a large local density of states.

Keywords:NMR;silicon clathrate compounds;superconductivity