Mechanisms of localization in isotope-substituted dynamical Jahn-Teller systems Naoya Iwahara, Tohru Sato, Kazuyoshi Tanaka and Liviu F. Chibotaru EPL, 100 4 (2012) 43001 Published online: 30 November 2012 DOI: 10.1209/0295-5075/100/43001