Bulk magnetization and strong intrinsic pinning in Ni-doped BaFe2As2 single crystals

Abstract

We report on measurements of isothermal irreversible magnetization loops (M(H)) of Ni-doped BaFe2-xNixAs2 single crystals with x=0.1 and x=0.14 in magnetic fields up to 14T. For both samples in field H//c-axis and H//ab-plane, critical current density calculated from M(H) curves exceeds 106 A/cm2 at low temperatures suggesting strong intrinsic pinning in our crystals. In a broad temperature range 2-17K in both field orientations nearly optimally doped single crystal displays second magnetization peak (fish-tail effect). For H//c-axis, curves of the normalized pinning force, as a function of reduced field, measured at different temperatures obey scaling relation with peak position 0.33 for BaFe1.86Ni0.14As2 crystal and 0.4 for BaFe1.9Ni0.1As2 sample indicating single normal point pinning mechanism. In striking contrast, in H//ab-plane orientation, the scaling of curves is absent.

arXiv comment20 pages, 6 figures, 1 table, 24 references

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Cited by in corpus (9)

• Vortex dynamic, pinning and irreversibility field investigation in EuRbFe4As4 superconductor
• Superconducting properties of Ba(Fe1-xNix)2As2 thin films in high magnetic fields
• On the Structure of Superconducting Order Parameter in High-Temperature Fe-Based Superconductors
• Synthesis of Electron- and Hole-Doped Bulk BaFe2As2 Superconductors by Mechanical Alloying
• Doping Dependence of the Second Magnetization Peak, Critical Current Density and Pinning Mechanism in BaFe${}_{2-x}$Ni${}_x$As${}_2$ Pnictide Superconductors
• Evolution of vortex pinning in the FeSe${}_{1-x}$S${}_x$ system
• Antiferromagnetic resonances in twinned EuFe2As2 single crystal
• Elastic contribution to interaction of vortices in uniaxial superconductors
• Superconducting Order Parameters in overdoped BaFe${}_{1.86}$Ni${}_{0.14}$As${}_2$ Revealed by Multiple Andreev Reflection Spectroscopy of Planar Break-Junctions