Doping evolution of the anisotropic upper critical fields in iron-based superconductor Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$

M. A. Tanatar, Yong Liu, J. Jaroszynski +3

In-plane resistivity measurements as a function of temperature and magnetic field up to 35~T with precise orientation within the crystallographic $ac-$plane were used to study the…