Holographic conductivity of holographic superconductors with higher-order corrections Ahmad Sheykhi, Afsoon Ghazanfari and Amin Dehyadegari Eur. Phys. J. C, 78 2 (2018) 159 Published online: 23 February 2018 DOI: 10.1140/epjc/s10052-018-5650-2