Visual evidence of the magnetic glass state and its re-crystallization in Gd5Ge4M. K. Chattopadhyay, S. B. Roy, K. Morrison, J. D. Moore, G. K. Perkins, L. F. Cohen, K. A. Gschneidner and V. K. PecharskyEPL, 83 5 (2008) 57006DOI: https://doi.org/10.1209/0295-5075/83/57006