Tetragonal magnetic phase in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ from x-ray and neutron diffraction

Jared M. Allred, Sevda Avci, Duck Young Chung +8

Combined neutron and x-ray diffraction experiments demonstrate the formation of a low-temperature minority tetragonal phase in Ba${}_{0.76}$K${}_{0.24}$Fe${}_2$As${}_2$ in addition to the…