A novel iron-based superconductor synthesized by the ion exchange technique

The superconductivity of the FeSe-based superconductor is extremely sensitive to Fe vacancies in the FeSe plane. In order to reduce the formation of Fe vacancies in the FeSe plane, various low-temperature methods are developed. However, it is still complex and time consuming to control the Fe vacancies concentration. Here, a hybrid iron-based superconductor, Li0.21Se0.05(EG)(0.26)FeSe (EG: ethylene glycol, C2H6O2), is synthesized by a solvothermal ion-exchange technique using a nearly vacancy-free precursor of (TBA)(0.3)FeSe as the matrix. Bulk superconductivity with transition temperature (T (c)) of 30 K is confirmed by the characterization with the magnetic susceptibility and resistivity measurements. Compared with the pristine FeSe single crystal, x-ray photoelectron spectroscopy results show a decrease of the Fe valence, indicating that electron doping to FeSe plane accounts for the increase of the T (c). Our result suggests that (TBA)(0.3)FeSe, a nearly vacancy-free precursor with a large distance between the adjacent FeSe planes, is a good template candidate for the synthesis of other hybrid iron-based superconductors using the ion exchange technique.

Automated summary

In this study, a hybrid iron-based superconductor Li0.21Se0.05(EG)(0.26)FeSe was synthesized using a solvothermal ion-exchange technique, where a nearly vacancy-free precursor (TBA)(0.3)FeSe was used as the matrix. The Fe vacancies concentration in the FeSe plane was effectively reduced, and the bulk superconductivity with a transition temperature of 30 K was confirmed.