Origin of cluster spin glass and nuclear Schottky anomaly in Mn50Ni38.5Sn11.5 alloy Mayukh K. Ray, K. Bagani, P. K. Mukhopadhyay and S. Banerjee EPL, 109 4 (2015) 47006 Published online: 04 March 2015 DOI: 10.1209/0295-5075/109/47006