Electronic, magnetic and optical properties of double perovskite Sr2CuIrO6 Dafang He, Xue Du, Yuqing Liu, Huayue Mei, Hongkuan Yuan and Nanpu Cheng Eur. Phys. J. Plus, 136 1 (2021) 82 Published online: 13 January 2021 DOI: 10.1140/epjp/s13360-020-01054-8