Two-dome structure in electron-doped iron arsenide superconductors. Iimura, S., Matuishi, S., Sato, H., Hanna, T., Muraba, Y., Kim, S. W., Kim, J. E., Takata, M., & Hosono, H. Nature Communications, 3:943+, 2012. ![Two-dome structure in electron-doped iron arsenide superconductors [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Iron arsenide superconductors based on the material LaFeAsO1-xFx are characterized by a two-dimensional Fermi surface (FS) consisting of hole and electron pockets yielding structural and antiferromagnetic transitions at x = 0. Electron doping by substituting O2- with F- suppresses these transitions and gives rise to superconductivity with a maximum Tc = 26 K at x = 0.1. However, the over-doped region cannot be accessed due to the poor solubility of F- above x = 0.2. Here we overcome this problem by doping LaFeAsO with hydrogen. We report the phase diagram of LaFeAsO1-xHx (x < 0.53) and, in addition to the conventional superconducting dome seen in LaFeAsO1-xFx, we find a second dome in the range 0.21 < x < 0.53, with a maximum Tc of 36 K at x = 0.3. Density functional theory calculations reveal that the three Fe 3d bands (xy, yz, zx) become degenerate at x = 0.36, whereas the FS nesting is weakened monotonically with x. These results imply that the band degeneracy has an important role to induce high Tc.
@article{iimura_two-dome_2012,
title = {Two-dome structure in electron-doped iron arsenide superconductors},
volume = {3},
issn = {2041-1723},
url = {http://dx.doi.org/10.1038/ncomms1913},
doi = {10.1038/ncomms1913},
abstract = {Iron arsenide superconductors based on the material LaFeAsO1-xFx are characterized by a two-dimensional Fermi surface (FS) consisting of hole and electron pockets yielding structural and antiferromagnetic transitions at x = 0. Electron doping by substituting O2- with F- suppresses these transitions and gives rise to superconductivity with a maximum Tc = 26 K at x = 0.1. However, the over-doped region cannot be accessed due to the poor solubility of F- above x = 0.2. Here we overcome this problem by doping LaFeAsO with hydrogen. We report the phase diagram of LaFeAsO1-xHx (x \< 0.53) and, in addition to the conventional superconducting dome seen in LaFeAsO1-xFx, we find a second dome in the range 0.21 \< x \< 0.53, with a maximum Tc of 36 K at x = 0.3. Density functional theory calculations reveal that the three Fe 3d bands (xy, yz, zx) become degenerate at x = 0.36, whereas the FS nesting is weakened monotonically with x. These results imply that the band degeneracy has an important role to induce high Tc.},
journal = {Nature Communications},
author = {Iimura, Soshi and Matuishi, Satoru and Sato, Hikaru and Hanna, Taku and Muraba, Yoshinori and Kim, Sung W. and Kim, Jung E. and Takata, Masaki and Hosono, Hideo},
year = {2012},
pages = {943+}
}
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