Layered (Li, Fe)OHFeSe compounds are attractive due to their high-temperature superconductivity. In this work, (Li, Fe)OHFeSe samples were doped via a solvothermal method using a saturated solution of calcium glyceroxides in glycerol. Dynamic magnetic susceptibility measurements revealed that the doped samples exhibit superconductivity at a temperature of Tc = 46 K, which significantly exceeds the Tc = 37 K of the pristine samples. Based on X-ray diffraction data, it is suggested that the doping is due to the incorporation of calcium ions into the (Li, Fe)OH layers, whereas the structure of the FeSe layers in the doped (Li, Fe)OHFeSe compound remains unchanged.
Palnichenko et al. (Sun,) studied this question.