Physics – Condensed Matter – Superconductivity
Scientific paper
2011-07-07
Phys. Rev. Lett. 107, 257001 (2011)
Physics
Condensed Matter
Superconductivity
Accepted by Physical Review Letters. Updated in Figure 2 and supplementary information
Scientific paper
We investigate the physical effects of translational symmetry breaking in Fe-based high-temperature superconductors due to alternating anion positions. In the representative parent compounds, including the newly discovered Fe-vacancy-ordered $\mathrm{K_{0.8}Fe_{1.6}Se_2}$, an unusual change of orbital character is found across the one-Fe Brillouin zone upon unfolding the first-principles band structure and Fermi surfaces, suggesting that covering a larger one-Fe Brillouin zone is necessary in experiments. Most significantly, the electron pockets (critical to the magnetism and superconductivity) are found only created with the broken symmetry, advocating strongly its full inclusion in future studies, particularly on the debated nodal structures of the superconducting order parameter.
Berlijn Tom
Ku Wei
Lee Chi-Cheng
Lin Chia-Hui
Wang Limin
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