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We present distinct demarcation of the Bragg glass (BG) to multi-domainvortex glass (VG) transition line and the eventual amorphization of the VGphase in a weakly pinned single crystal of the superconducting compoundCa3Ir4Sn13 on the basis of comprehension of the different yields about thesecond magnetization peak (SMP) anomaly in the dc magnetization and thecorresponding anomalous feature in the ac susceptibility measurements. Theshaking by a small ac magnetic field, inevitably present in the acsusceptibility measurements, is seen to result in contrasting responses in twodifferent portions of the field-temperature (H, T) phase space of themulti-domain VG. In one of the portions, embracing the BG to VG transitionacross the onset of the SMP anomaly, the ac drive is surprisingly seen toassist the transformation of the well ordered BG phase to a lesser ordered VGphase. The BG phase exists as a superheated state over a small portion of theVG space and this attests to the first order nature of the BG to VG transition.

Dual role of an ac driving force and the underlying two distinct order-disorder transitions in the vortex phase diagram of Ca3Ir4Sn13