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

Abstract

We present a systematic study of electrical resistivity, Hall coefficient, magneto-optical imaging, magnetization, and STEM analyses of KCa${}_2$Fe${}_4$As${}_4$F${}_2$ single crystals. Sharp diamagnetic transition and magneto-optical imaging reveal homogeneity of single crystal and prominent Bean-like penetrations of vortices. Large anisotropy of electrical resistivity, with ${\rho }_c/{\rho }_{ab}$ > 100, and semiconductor-like ${\rho }_c$ suggest that the electronic state is quasi two-dimensional. Hall effect measurements indicate that KCa${}_2$Fe${}_4$As${}_4$F${}_2$ is a multiband system with holes as main carriers. Magnetization measurements reveal significantly larger J${}_c$ compared with that in other iron-based superconductors with different values of J${}_c$ 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.

arXiv comment23 pages, 10 figures

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• Charge Density Wave order and electron-phonon coupling in ternary superconductor Bi${}_2$Rh${}_3$Se${}_2$
• Ultrafast Optical Spectroscopy Evidence of Pseudogap and Electron-Phonon Coupling in an Iron-Based Superconductor KCa${}_2$Fe${}_4$As${}_4$F${}_2$
• Single particle tunneling spectroscopy and superconducting gaps in layered iron based superconductor KCa${}_2$Fe${}_4$As${}_4$F${}_2$
• Anomalous second magnetization peak in 12442-type RbCa${}_2$Fe${}_4$As${}_4$F${}_2$ superconductors
• Expression with self-consistent magnetic units for calculation of critical current density using the Bean's Model
• Pseudogap and Strong Pairing Induced by Incipient and Shallow Bands in the Quasi-Two-Dimensional KCa${}_2$Fe${}_4$As${}_4$F${}_2$
• Second magnetization peak, anomalous field penetration, and Josephson vortices in KCa${}_2$Fe${}_4$As${}_4$F${}_2$ bilayer pnictide superconductor
• Anomalous metallic oxygen band in the potential superconductor KCa${}_2$Fe${}_4$As${}_4$O${}_2$
• Interplay of electron-phonon coupling, pseudogap, and superconductivity in CsCa${}_2$Fe${}_4$As${}_4$F${}_2$ studied using ultrafast optical spectroscopy