High-Pressure Studies for Hydrogen Substituted CaFeAsF1−x H x and SmFeAsO1−x H x
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Recently hydrogen substituted CaFeAsF1−x H x and SmFeAsO1−x H x have been successfully synthesized. Hydrogen atoms are incorporated as H− ions at the F− sites. However, H substitution for non-superconducting CaFeAsF does not induce superconductivity because of isovalent substitution. Since CaFeAsF is known to exhibit superconductivity under high pressure, electrical resistivity and X-ray diffraction measurements have been carried out for CaFeAsH under high pressure in order to study the superconductivity for the material having Ca–H layer. Electrical resistivity measurements also have been done for SmFeAsO1−x H x from under-doped to over-doped region (x=0.5).
KeywordsHigh pressure H− ions CaFeAsF1−xHx SmFeAsO1−xHx
This work was supported by “Strategic Research Base Development” Program for Private Universities (2009, S0901022) subsidized by the Ministry of Education, Culture, Sports, Science and Technology (MEXT).