Doping dependent Irreversible Magnetic Properties of Ba(Fe1-xCox)2As2 Single Crystals

Abstract

We discuss the irreversible magnetic properties of self-flux grown Ba(Fe1-xCox)2As2 single crystals for a wide range of concentrations covering the whole phase diagram from the underdoped to the overdoped regime, x=0.038, 0.047, 0.058, 0.071, 0.074, 0.10, 0.106 and 0.118. Samples were characterized by a magneto-optical method and show excellent spatial uniformity of the superconducting state. The overall behavior closely follows classical Bean model of the critical state. The field-dependent magnetization exhibits second peak at a temperature and doping - dependent magnetic field, Hp. The evolution of this fishtail feature with doping is discussed. Magnetic relaxation is time-logarithmic and unusually fast. Similar to cuprates, there is an apparent crossover from collective elastic to plastic flux creep above Hp. At high fields, the field dependence of the relaxation rate becomes doping independent. We discuss our results in the framework of the weak collective pinning and show that vortex physics in iron-based pnictide crystals is much closer to high-Tc cuprates than to conventional s-wave (including MgB2) superconductors.

for the special issue of Physica C on iron-based pnictide superconductors

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• Iron based superconductors: magnetism, superconductivity and electronic structure
• London Penetration Depth in Iron - based Superconductors
• Flux dynamics and vortex phase diagram in $Ba(F{e}_{1-x}C{o}_x{)}_{2}A{s}_2$ single crystals revealed by magnetization and its relaxation
• Flux pinning in (1111) iron-pnictide superconducting crystals
• Intrinsic pinning on structural domains in underdoped single crystals of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Temperature and time scaling of the peak-effect vortex configuration in FeTe${}_{0.7}$Se${}_{0.3}$
• Doping evolution of the absolute value of the London penetration depth and superfluid density in single crystals of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Charge doping-induced quasiparticle scattering in iron-pnictide superconductors as probed by vortex pinning
• Pressure versus concentration tuning of the superconductivity in Ba(Fe(1-x)Cox)2As2
• Magneto-optical study of Ba(Fe${}_{1-x}$T${}_x$)${}_2$As${}_2$ (T=Co, Ni) single crystals irradiated with heavy-ions
• Symmetry and disorder of the vitreous vortex lattice in an overdoped BaFe_{2-x}Co_xAs_2 superconductor: Indication for strong single-vortex pinning
• Anomalous Meissner effect in pnictide superconductors
• Magnetization relaxation, critical current density and vortex dynamics in a Ba${}_{0.66}$K${}_{0.32}$BiO${}_{3+\delta }$ single crystal
• Angular resolved specific heat in iron-based superconductors: the case for nodeless extended $s$-wave gap
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• Planar pinning induced, lowering of vortex dimensionality and low field melting in a single crystal of Ba0.6K0.4Fe2As2