  We report the observation of positive magnetization signal at the onset of
superconducting transition in isothemral and isomagnetic measurements in single
crystal Niobium sphere. The PME displays two regimes, viz., low applied
magnetic fields H < 4 Oe) and higher fields H > 120 Oe, and the PME signal is
absent at the intermediate magnetic fields. Subsequently, the isothermal
magnetization data shows the presence of positive signal at the superconductor
to normal transition. Using this data we are able to plot the H(c3)-T(c3) line,
at which the positive magnetization signal nucleates, in the phase diagram of
single crystal Nb.
