Hydrogen in layered iron arsenide: indirect electron doping to induce superconductivity

Details Hydrogen in layered iron arsenide: indirect electron doping to induce superconductivity Hydrogen in layered iron arsenide: indirect electron doping to induce superconductivity

2011-03-06

arxiv.org/abs/1103.1177v3

Phys. Rev. B 84, 024521 (2011)

Physics

Condensed Matter

Superconductivity

14 pages, 4 figures

Scientific paper

10.1103/PhysRevB.84.024521

Utilizing the high stability of calcium and rare earth hydrides, CaFeAsF1-xHx (x = 0.0-1.0) and SmFeAsO1-xHx (x = 0.0-0.47) have been first synthesized using high pressure to form hydrogen-substituted 1111 type iron-arsenide superconductors. Neutron diffraction and density functional calculations have demonstrated that the hydrogens are incorporated as H- ions occupying F- sites in the blocking layer of CaFeAsF. The resulting CaFeAsF1-xHx is non-superconducting, whereas SmFeAsO1-xHx is a superconductor, with an optimal Tc = 55 K at x 0.2. It was found that up to 40% of the O2- ions can be replaced by H- ions, with electrons being supplied into the FeAs-layer to maintain neutrality (O2- = H-+ e-). When x exceeded 0.2, Tc was reduced corresponding to an electron over-doped region.

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