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The peak effect (PE) has been observed in a twinned crystal ofYBa$_2$Cu$_3$O$_{7-\delta}$ for H$\parallel$c in the low field range, close tothe zero field superconducting transition temperature (T$_c$(0)) . A sharpdepinning transition succeeds the peak temperature T$_p$ of the PE. The PEphenomenon broadens and its internal structure smoothens out as the field isincreased or decreased beyond the interval between 250 Oe and 1000 Oe.Moreover, the PE could not be observed above 10 kOe and below 20 Oe. The locusof the T$_p$(H) values shows a reentrant characteristic with a nose likefeature located at T$_p$(H)/T$_c$(0)$\approx$0.99 and H$\approx$100 Oe (wherethe FLL constant a$_0$$\approx$penetration depth $\lambda$). The upper part ofthe PE curve (0.5 kOe$<$H$<$10 kOe) can be fitted to a melting scenario withthe Lindemann number c$_L$$\approx$0.25. The vortex phase diagram near T$_c$(0)determined from the characteristic features of the PE inYBa$_2$Cu$_3$O$_{7-\delta}$(H$\parallel$c) bears close resemblance to that inthe 2H-NbSe$_2$ system, in which a reentrant PE had been observed earlier.Comment: 15 pages and 7 figure

Amorphization of vortex matter and indication of a reentrant peak effect in YBa2Cu3O7-δ