Evidence for carrier-induced high- ferromagnetism in Mn-doped GaN film S. Yoshii, S. Sonoda, T. Yamamoto, T. Kashiwagi, M. Hagiwara, Y. Yamamoto, Y. Akasaka, K. Kindo and H. Hori EPL, 78 3 (2007) 37006 Published online: 27 April 2007 DOI: 10.1209/0295-5075/78/37006