TY - JOUR
T1 - Hydrogen in layered iron arsenides
T2 - Indirect electron doping to induce superconductivity
AU - Hanna, Taku
AU - Muraba, Yoshinori
AU - Matsuishi, Satoru
AU - Igawa, Naoki
AU - Kodama, Katsuaki
AU - Shamoto, Shin Ichi
AU - Hosono, Hideo
PY - 2011/7/15
Y1 - 2011/7/15
N2 - Utilizing the high stability of calcium and rare-earth hydrides, CaFeAsF1-xHx (x = 0.0-1.0) and SmFeAsO1-xH x (x = 0.0-0.47) have been 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-xH x is nonsuperconducting, 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 overdoped region.
AB - Utilizing the high stability of calcium and rare-earth hydrides, CaFeAsF1-xHx (x = 0.0-1.0) and SmFeAsO1-xH x (x = 0.0-0.47) have been 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-xH x is nonsuperconducting, 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 overdoped region.
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U2 - 10.1103/PhysRevB.84.024521
DO - 10.1103/PhysRevB.84.024521
M3 - Article
AN - SCOPUS:79961178008
SN - 1098-0121
VL - 84
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 2
M1 - 024521
ER -