Enhancement of critical current density and mechanism of vortex pinning in H${}^{+}$-irradiated FeSe single crystal

Abstract

In this report, we comprehensively study the effect of H${}^{+}$ irradiation on the critical current density, $J_c$, and vortex pinning in FeSe single crystal. It is found that the value of $J_c$ for FeSe is enhanced more than twice after 3-MeV H${}^{+}$ irradiation. The scaling analyses of the vortex pinning force based on the Dew-Hughes model reveal that the H${}^{+}$ irradiation successfully introduce point pinning centers into the crystal. We also find that the vortex creep rates are strongly suppressed after irradiation. Detailed analyses of the critical current dependent pinning energy based on the collective creep theory and extend Maley's method show that the H${}^{+}$ irradiation enhances the value of $J_c$ before the flux creep, and also reduces the size of flux bundle, which will further reduce the field dependence of $J_c$ due to vortex motion.

arXiv comment4 pages, 4figures

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• Perspective: Challenges and Transformative Opportunities in Superconductor Vortex Physics
• Imaging anisotropic vortex dynamics in FeSe
• Vortex phases and glassy dynamics in the highly anisotropic superconductor HgBa${}_2$CuO${}_{4+\delta }$
• Electronic transport properties and hydrostatic pressure effect of FeSe${}_{0.67}$Te${}_{0.33}$ single crystals free of phase separation
• Significant enhancement of critical current density in H+-intercalated FeSe single crystal
• Fully gapped superconductivity without sign reversal in the topological superconductor PbTaSe${}_2$
• Electronic States and Energy Dissipations of Vortex Core in Pure FeSe Single Crystals Investigated by Microwave Surface Impedance Measurements
• Ion-selective scattering studied by the variable-energy electron irradiation of Ba${}_{0.2}$K${}_{0.8}$Fe${}_2$As${}_2$ superconductor
• Intrinsic pinning of FeSe${}_1$${}_{-}$${}_x$S${}_x$ single crystals probed by torque magnetometry
• Effects of disorder on the quantum transport properties in topologically nontrivial metal PbTaSe${}_2$
• Increase of critical current density in FeSe superconductor by strain effect
• Higher critical currents yet faster vortex creep in EuBa${}_2$Cu${}_3$O${}_y$ films containing coherent artificial pinning centers
• Enhancement of $J$${}_c$ by Proton Irradiation in HgBa${}_2$Ca${}_2$Cu${}_3$O${}_8$${}_{+}$${}_{\delta }$ Single Crystals
• Tripling of the Superconducting Critical Current Density in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$ Retained After Pressure Release