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
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.
