Transport hysteresis of the oxide superconductor ${\mathrm{Y}}_1$${\mathrm{Ba}}_2$${\mathrm{Cu}}_3$${\mathrm{O}}_{7\mathrm{-}\mathrm{x}}$ in applied fields

The results of transport measurements on the oxide superconductor ${\mathrm{Y}}_1$ ${\mathrm{Ba}}_2$ ${\mathrm{Cu}}_3$ ${\mathrm{O}}_{7\mathrm{-}\mathrm{x}}$ in the presence of an external magnetic field with various dc currents are reported. The observed highly irreversible behavior and other peculiar features are analyzed considering the granularity and weak-link nature of the bulk oxide superconductors. This study confirms the nonideal type-II superconducting nature of the compound.