cond-mat.supr-con
Enhancement of superconductivity in electron-hole coexisting Sr$_{1-x}$Eu$_{x}$CuO$_{2+y}$ films
Hang Yan Ze-Xian Deng Xue-Qing Yu Yan-Ling Xiong Qun Zhu Ding Zhang Can-Li Song Xu-Cun Ma Qi-Kun Xue