Observation of thermally activated glassiness and memory dip in a-NbSi insulating thin films J. Delahaye, T. Grenet, C. A. Marrache-Kikuchi, A. A. Drillien and L. Bergé EPL, 106 6 (2014) 67006 Published online: 19 June 2014 DOI: 10.1209/0295-5075/106/67006