Restoration of tetragonal $C_4$ symmetry coexistent with filamentary superconductivity in the pressure induced intermediate phase in the iron-based superconductor Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$

Yan Zheng, Pok Man Tam, Jianqiang Hou +4

The hole doped Fe-based superconductors Ba${}_{1-x}$A${}_x$Fe${}_2$As${}_2$ (where A=Na or K) show a particular rich phase diagram. It was observed that an intermediate re-entrant tetragon…