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We present a systematic study of electrical resistivity, Hall coefficient,magneto-optical imaging, magnetization, and STEM analyses ofKCa${_2}$Fe${_4}$As${_4}$F${_2}$ single crystals. Sharp diamagnetic transitionand magneto-optical imaging reveal homogeneity of single crystal and prominentBean-like penetrations of vortices. Large anisotropy of electrical resistivity,with ${\rho _c / \rho _{ab}}$ > 100, and semiconductor-like ${\rho _c}$ suggestthat the electronic state is quasi two-dimensional. Hall effect measurementsindicate that KCa${_2}$Fe${_4}$As${_4}$F${_2}$ is a multiband system with holesas main carriers. Magnetization measurements reveal significantly larger J$_c$compared with that in other iron-based superconductors with different values ofJ$_c$ depending on the direction of magnetic field. Origin of these J$_c$characteristics is discussed based on microstructural observations using STEM.In addition, further enhancement of J$_c$ in KCa${_2}$Fe${_4}$As${_4}$F${_2}$for future application is demonstrated in terms of heavy-ion irradiation.

Anisotropic physical properties and large critical current density in KCa${_2}$Fe${_4}$As${_4}$F${_2}$ single crystal