3[3]Gallagher W J,Worthington T K,Dinger T R,et al.Broader perspective on the high-temperature superconducting system[J].Physica,1987,148B:288.
4[4]Brandt W,Dupasquier A (Eds.),Positron Solid-State Physics[M].North-Holland:Amsterdam,1983.
5[5]Yokoya T,Fukushima A,Yamanaka S,et al.Electronic structure and superconducting gap of silicon clathrate Ba8Si46 studied with ultrahigh-resolution photoemission spectroscopy[J].Phys Rev B,2001,64:172504.
6[6]Duspaquier A,Mills A P (eds).Positrons Spectroscopy of Solids[M].Amsterdam,Oxford,Tokyo,Washington D C,1995.
7[8]Pickett W E,Electronic structure of the high-temperature oxide superconductors[J].Rev Modern Phys,1989,62:433-450.
8[9]Tokura Y,Arami T.New classification method for layered copper oxide compounds and its application to design of new high TC superconductors[J].Jpn J Appl Phys,1990,29(11):2388-2390.
9[11]Sundar C S,Bharathi A,Ching W Y,Jean YC.Temperature dependence of positron annihilation parameters in Tl-Ba-Ca-Cu-O superconductors[J].Phys Rev,1990,B 42:2193-2199.
