The magnetization M(T)at a fixed field,the magnetization M(H)at different temperatures of the Ba-Y-Cu-O samples with zero resistance at 91.5K have been measured.The results show that Ba-Y-Cu-O is a type-II superconduc...The magnetization M(T)at a fixed field,the magnetization M(H)at different temperatures of the Ba-Y-Cu-O samples with zero resistance at 91.5K have been measured.The results show that Ba-Y-Cu-O is a type-II superconductor.We also present the anomaly of M(T)at low temperature.At T approaching OK,M(H)changes from negative to positive.The relationship between the area of magnetic hysteresis loop and the critical current density is discussed.展开更多
Point-contact tunneling measurements of the oxide superconductor Y-Ba-Cu-O were carried out with both Nb and Mo tips.An energy gap,Δ=18.5meV and 2Δ/kT_(c)=4.7 were obtained.The result is consistent with the strong-c...Point-contact tunneling measurements of the oxide superconductor Y-Ba-Cu-O were carried out with both Nb and Mo tips.An energy gap,Δ=18.5meV and 2Δ/kT_(c)=4.7 were obtained.The result is consistent with the strong-coupling theory.The tunneling conductance curves indicate a granular feature of the sample.展开更多
基金supported by the Science Fund of the Chinese Academy of Sciences。
文摘The magnetization M(T)at a fixed field,the magnetization M(H)at different temperatures of the Ba-Y-Cu-O samples with zero resistance at 91.5K have been measured.The results show that Ba-Y-Cu-O is a type-II superconductor.We also present the anomaly of M(T)at low temperature.At T approaching OK,M(H)changes from negative to positive.The relationship between the area of magnetic hysteresis loop and the critical current density is discussed.
文摘Point-contact tunneling measurements of the oxide superconductor Y-Ba-Cu-O were carried out with both Nb and Mo tips.An energy gap,Δ=18.5meV and 2Δ/kT_(c)=4.7 were obtained.The result is consistent with the strong-coupling theory.The tunneling conductance curves indicate a granular feature of the sample.
