Enhance ferromagnetism by stabilizing the cation vacancies in GaNZhen-kun Tang, Deng-Yu Zhang, Li-Ming Tang, Ling-Ling Wang and Ke-Qiu ChenEur. Phys. J. B, 86 6 (2013) 284DOI: https://doi.org/10.1140/epjb/e2013-30474-0