Light-Cone Spreading of Perturbations and the Butterfly Effect in a Classical Spin Chain - Das, Avijit; Chakrabarty, Saurish; Dhar, Abhishek; Kundu, Anupam; Huse, David A; Moessner, Roderich; Ray, Samriddhi Sankar; Bhattacharjee, Subhro (Physical review letters, 2018)