Physics – Condensed Matter – Superconductivity
Scientific paper
2012-02-06
Physics
Condensed Matter
Superconductivity
8 pages, 6 figures
Scientific paper
Based on an effective 12-orbital tight-binding model, we examine the superconducting states induced by the antiferromagnetic fluctuations for iron-vacancy-ordered A$_{y}$Fe$_{2-x}$Se$_{2}$. It is shown that due to the broken reflection symmetry of the iron vacancies, new superconducting states with $C_{4h}$ symmetry emerges. In particular, we show that the in the $C_{4h}$ symmetry, zeros of angles for the pairing momenta are free parameters. Hence there are more degrees of freedoms to characterize the superconducting gaps, which can further increase the gain of the condensation energy. Nonetheless, similar to other iron-based superconductors, the singlet ground state is still dominated by \textit{s}-wave or \textit{d}-wave, which are nearly degenerate with anisotropic gaps. Furthermore, \textit{s}-wave and \textit{d}-wave superconducting states are separated by a quantum critical point controlled by the Hund's rule coupling $J_{H}$.
Huang Shin-Ming
Mou Chung-Yu
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