تقرير
Hydrogen in layered iron arsenide: indirect electron doping to induce superconductivity
| العنوان: | Hydrogen in layered iron arsenide: indirect electron doping to induce superconductivity |
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| المؤلفون: | Hanna, Taku, Muraba, Yoshinori, Matsuishi, Satoru, Kodama, Katsuaki, Shamoto, Shin-ichi, Hosono, Hideo |
| المصدر: | Phys. Rev. B 84, 024521 (2011) |
| سنة النشر: | 2011 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Superconductivity |
| الوصف: | 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. Comment: 14 pages, 4 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevB.84.024521 |
| URL الوصول: | http://arxiv.org/abs/1103.1177 |
| رقم الأكسشن: | edsarx.1103.1177 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevB.84.024521 |
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