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
Ⅰ. INTRODUCTION Recendy, the research on oxide superconductor has achieved tremendous progress. New records of critical temperature were reported. In this work, the resistivity of Ba-Y-Cu oxide supercondutor and its ...Ⅰ. INTRODUCTION Recendy, the research on oxide superconductor has achieved tremendous progress. New records of critical temperature were reported. In this work, the resistivity of Ba-Y-Cu oxide supercondutor and its density of critical current as a function of temperature are measured by the method of persistent current.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.
文摘Ⅰ. INTRODUCTION Recendy, the research on oxide superconductor has achieved tremendous progress. New records of critical temperature were reported. In this work, the resistivity of Ba-Y-Cu oxide supercondutor and its density of critical current as a function of temperature are measured by the method of persistent current.
