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Doping evolution of the anisotropic upper critical fields in the iron-based superconductor Ba1−xKxFe2As2
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 upper critical field ${H}_{c2}$ of the hole-doped iron-based superconductor ${\mathrm{Ba}}_{1\ensuremath{-}x}{\mathrm{K}}_{x}{\mathrm{Fe}}_{2}{\mathrm{As}}_{2}$. Compositions of the samples studied spanned from under- doped $x=0.17$ $({T}_{c}=12$ K) …