Excited states of holographic superconductors with backreaction Yong-Qiang Wang, Hong-Bo Li, Yu-Xiao Liu and Yin Zhong Eur. Phys. J. C, 81 7 (2021) 628 Published online: 19 July 2021 DOI: 10.1140/epjc/s10052-021-09365-5