Enhanced superconducting transition temperature in hyper-interlayer-expanded FeSe despite the suppressed electronic nematic order and spin fluctuations

M. Majcen Hrovat, P. Jeglic, M. Klanjsek +8

The superconducting critical temperature, $T_{\mathrm{c}}$, of FeSe can be dramatically enhanced by intercalation of a molecular spacer layer. Here we report on a ${}^{77}$Se, ${}^7$Li and…