cond-mat.supr-con
Low-temperature mean valence of nickel ions in pressurized La$_3$Ni$_2$O$_7$
Shu Cai Yazhou Zhou Hualei Sun Kai Zhang Jinyu Zhao Mengwu Huo Lucie Nataf Yuxin Wang Jie Li Jing Guo Kun Jiang Meng Wang Yang Ding Wenge Yang Yi Lu Qingyu Kong Qi Wu Jiangping Hu Tao Xiang Ho-kwang Mao Liling Sun