Vanishing vortex creep at the transition from ordered to disordered vortex phases in Ba${}_{0.64}$K${}_{0.36}$Fe${}_2$As${}_2$

Abstract

By measuring the dynamical and conventional magnetization relaxation of the Ba${}_{0.64}$K${}_{0.36}$Fe${}_2$As${}_2$ single crystals, we found strong second peak effect on the magnetization hysteresis loops. It is found that there is a kink of magnetization at a field between the valley and maximum magnetization. Interestingly, the magnetization relaxation rate has a deep minimum at the field with the kink, indicating a diminished vortex creep. The relaxation rate at this field is clearly smaller than the so-called universal lower limit of the relaxation rate characterized by ($S_0\approx G{i}^{1/2}(T/T_{\mathrm{c}}$). This diminished vortex creep is associated with the origin of the SMP effect and attributed to the strongly hindered flux motion when experiencing the transition from the quasi-ordered to disordered vortex phases.

arXiv comment5 figures

References in corpus (21)

• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• Plastic vortex-creep in YBa${}_2$Cu${}_3$O${}_{7-x}$ crystals
• New Fe-based superconductors: properties relevant for applications
• Vortex phase diagram of Ba(Fe0.93Co0.07)2As2 single crystals
• Fishtail effect and the vortex phase diagram of single crystal Ba0.6K0.4Fe2As2
• Determination of anisotropic Hc2 up to 60 T in (Ba0.55K0.45)Fe2As2 single crystals
• 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
• Observation of Lattice and Andreev Bound States of Vortices in Ba0.6K0.4Fe2As2 Single Crystals with Scanning Tunneling Microscopy/Spectroscopy
• Anisotropy of the upper critical field in a Co-doped BaFe2As2 single crystal
• Growth and characterization of A_{1-x}K_xFe_2As_2 (A = Ba, Sr) single crystals with x=0 - 0.4
• Anomalous Peak Effect in CeRu2 and NbSe2 : Fracturing of a Flux Line Lattice?
• Temperature and time scaling of the peak-effect vortex configuration in FeTe${}_{0.7}$Se${}_{0.3}$
• Doping-dependent critical current properties in K, Co, and P-doped BaFe2As2 single crystals
• Flux-dynamics associated with the Second Magnetisation Peak in iron-pnictide Ba_{1-x}K_xFe_2As_2
• Universal Lower Limit on Vortex Creep in Superconductors
• Thermodynamic origin of the peak effect in the superconductor Nb3Sn
• Comparative study of vortex dynamics in CaKFe4As4 and Ba0.6K0.4Fe2As2 single crystals
• Critical current and vortex dynamics in single crystals of Ca(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Vortex images on Ba{1-x}KxFe2As2 observed directly by the magnetic force microscopy
• Vortex phase diagram and temperature-dependent second-peak effect in overdoped Bi${}_2$Sr${}_2$CuO${}_{6+\delta }$ crystals
• SANS Study of Vortex Lattice Structural Transition in Optimally Doped (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$

Cited by in corpus (1)

• Three Magnetization Peaks in HgBa${}_2$Ca${}_2$Cu${}_3$O${}_8$ Single Crystals