I. INTRODUCTIONT<sub>c</sub> of the oxide Bi-Sr-Cu-O system without lanthanide is 20 K. Doping Ca in proper amount will make it show 85 K superconductivity accompanied by 110 K superconducting trace. Y. Ko...I. INTRODUCTIONT<sub>c</sub> of the oxide Bi-Sr-Cu-O system without lanthanide is 20 K. Doping Ca in proper amount will make it show 85 K superconductivity accompanied by 110 K superconducting trace. Y. Koike et al. have obtained Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>y</sub> single crystal and measured its fundamental superconductivity parameters. Endo et al. have prepared single-phase 110 K Bi-展开更多
In the magnetization curve of Tl_4Ba_3Ca_3Cu_4O_y, bulk superconductor, there exists an anomaly of magnetization in the magnetic field lower than H_(Cl). The time dependence of DC magnetization in zero-field-cooled sa...In the magnetization curve of Tl_4Ba_3Ca_3Cu_4O_y, bulk superconductor, there exists an anomaly of magnetization in the magnetic field lower than H_(Cl). The time dependence of DC magnetization in zero-field-cooled sample has been investigated. The experimental result shows that there are giant flux creeps and flux jumps during the flux creep. The magnetization decay rate depends upon both the field and the temperature. The thermal activation of flux lines for U_0≈0.14 eV at 77.3 K is discussed.展开更多
基金Project supported by the National Centre for Research and Development on Superconductivity and the Office for Research on Superconductivity, Academia Sinica.
文摘I. INTRODUCTIONT<sub>c</sub> of the oxide Bi-Sr-Cu-O system without lanthanide is 20 K. Doping Ca in proper amount will make it show 85 K superconductivity accompanied by 110 K superconducting trace. Y. Koike et al. have obtained Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>y</sub> single crystal and measured its fundamental superconductivity parameters. Endo et al. have prepared single-phase 110 K Bi-
基金Project supported by the National Center for Research and Development of Superconductivity.
文摘In the magnetization curve of Tl_4Ba_3Ca_3Cu_4O_y, bulk superconductor, there exists an anomaly of magnetization in the magnetic field lower than H_(Cl). The time dependence of DC magnetization in zero-field-cooled sample has been investigated. The experimental result shows that there are giant flux creeps and flux jumps during the flux creep. The magnetization decay rate depends upon both the field and the temperature. The thermal activation of flux lines for U_0≈0.14 eV at 77.3 K is discussed.
