- 作者: 王啟銘 ; 楊玉富 ; 高惠春 等
- 作者服務機構: 淡江大學化學系
- 中文摘要: A superconducting oxide with a stoichiometry La/sub 3/CaBa/sub 3/Cu/sub 7/O/sub 15.5+x/, in which x=0.75, was prepared. It had a tetragonal triple-perovskite structure with lattice parameters a=3.879.ANG. and c=11.637.ANG.. According to resistivity measurements, a sharp superconducting transition,.DELTA.T/sub c/(10-90%)=1.5K, and T/sub c(zero)/=80K were observed. When it was measured at a small magnetic field(10-20 gauss) with field cooling, the sintered pellet showed a positive magnetic susceptibility, but the powdered sample exhibited the diamagnetism of a typical superconductor. However, no peculiar shielding effect was found in both the sintered and powdered samples.
- 英文摘要: --
- 中文關鍵字: La-Ca-Ba-Cu-O Superconductor; Meissner Effect; Flux Pinning; Resistivity; Magnetic Field; Shielding Effect; Superconductivity
- 英文關鍵字: 鑭鈣鋇銅氧超導體;電阻係數;磁場;屏蔽效應;超導性