A unidirectional reaction for synthesis of the high T_c superconductor YBa_2Cu_3O_x has been proposed, Its T_c is 90-94.5 K and △T is 1 K. The phase relationships in the system Y_2BaCuO_5-Y_2Cu_2O_5-CuO-YBa_2Cu_3O_x ...A unidirectional reaction for synthesis of the high T_c superconductor YBa_2Cu_3O_x has been proposed, Its T_c is 90-94.5 K and △T is 1 K. The phase relationships in the system Y_2BaCuO_5-Y_2Cu_2O_5-CuO-YBa_2Cu_3O_x were studied and discussed.展开更多
This paper studies a new electron irradiation effect of the formation,movement and growth of stacking fault in YBa_(2) Cu_(3) O_(6+x).The energy of electron irradiation is about 160keV.It would be a promising way to e...This paper studies a new electron irradiation effect of the formation,movement and growth of stacking fault in YBa_(2) Cu_(3) O_(6+x).The energy of electron irradiation is about 160keV.It would be a promising way to enhance the density of pinning centers.展开更多
Magnetic hysteresis loops and magnetization relaxation of a zone-melted Y Ba_(2)Cu_(3)O_(6+x) sample were measured by superconducting quantum interference device(SQUID)at temperature from 4.5 to 70K.The logarithmic be...Magnetic hysteresis loops and magnetization relaxation of a zone-melted Y Ba_(2)Cu_(3)O_(6+x) sample were measured by superconducting quantum interference device(SQUID)at temperature from 4.5 to 70K.The logarithmic behavior of niagnetic decay at 4.5 K and the gritdua,l deviation as the temperature is increased deinon-stra.ted the important role of nonlinea.r current density dependence of effective flux pinning potential U(J)in high temperature supcrconductors.展开更多
At temperature 77K and magnetic field 1-5 T,measurement of voltage-current curve in the melt-grown YBCO has been performed.The characteristics of the curves were found to be of an exponential form for E<lμV/cm.The...At temperature 77K and magnetic field 1-5 T,measurement of voltage-current curve in the melt-grown YBCO has been performed.The characteristics of the curves were found to be of an exponential form for E<lμV/cm.The behaviour is consistent with the flux creep model.The flux pinning potential energy has been calculated.展开更多
文摘A unidirectional reaction for synthesis of the high T_c superconductor YBa_2Cu_3O_x has been proposed, Its T_c is 90-94.5 K and △T is 1 K. The phase relationships in the system Y_2BaCuO_5-Y_2Cu_2O_5-CuO-YBa_2Cu_3O_x were studied and discussed.
基金Supported by the National Center for Research and Development of Superconductivity of Chinathe Foundation for Doctoral Education.
文摘This paper studies a new electron irradiation effect of the formation,movement and growth of stacking fault in YBa_(2) Cu_(3) O_(6+x).The energy of electron irradiation is about 160keV.It would be a promising way to enhance the density of pinning centers.
基金Supported by the National Center for Research and Development on Superconductivity of Cliinathe Foundation for Doctoral Education.
文摘Magnetic hysteresis loops and magnetization relaxation of a zone-melted Y Ba_(2)Cu_(3)O_(6+x) sample were measured by superconducting quantum interference device(SQUID)at temperature from 4.5 to 70K.The logarithmic behavior of niagnetic decay at 4.5 K and the gritdua,l deviation as the temperature is increased deinon-stra.ted the important role of nonlinea.r current density dependence of effective flux pinning potential U(J)in high temperature supcrconductors.
文摘At temperature 77K and magnetic field 1-5 T,measurement of voltage-current curve in the melt-grown YBCO has been performed.The characteristics of the curves were found to be of an exponential form for E<lμV/cm.The behaviour is consistent with the flux creep model.The flux pinning potential energy has been calculated.
