Apparently enhanced magnetization of Cu(I)-modified γ-Fe2O3 based nanoparticlesXiaoyan Qiu, Zhenghong He, Hong Mao, Ting Zhang, Yueqiang Lin, Xiaodong Liu, Decai Li, Xiangshen Meng and Jian LiEur. Phys. J. B, 90 11 (2017) 227DOI: https://doi.org/10.1140/epjb/e2017-80264-7