Abstract
The difference in thermal stability of F− and H− in 1111-type iron based superconductors allows selective hydrogen elimination from non-superconductive CaFeAsF0.8H0.2 by thermal annealing. The analyzed chemical composition of the resulting samples indicates that incorporated hydrogen was selectively eliminated by thermal annealing at 553 K for 72 h. The resulting hydrogen-eliminated sample shows bulk superconductivity with Tc = 29 K. This technique may be used for indirect electron doping for AeFeAeF (Ae, alkali-earth metal) iron based superconductor described by CaFeAsF1−xHx → CaFeAsF1−x + xe− + 1/2xH2↑.
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