Magnetic relaxation and collective vortex creep in FeTe${}_{0.6}$Se${}_{0.4}$ single crystal

Abstract

We study the vortex dynamics in high-quality FeTe${}_{0.6}$Se${}_{0.4}$ single crystal by performing magnetization measurements of the screening current density \emph{J}${}_s$ and flux creep rate \emph{S}. Temperature dependence of \emph{S} shows a plateau in the intermediate temperature region with a high creep rate $\sim$ 0.03, which is interpreted in the framework of the collective creep theory. A crossover from elastic to plastic creep is observed. The glassy exponent and barrier height for flux creep are directly determined by extended Maley's method. \emph{J}${}_s$ with flux creep, obtained from magnetic hysteresis loops, is successfully reproduced based on the collective creep analysis. We also approach critical current density without flux creep by means of the generalized inversion scheme, which proves that the $\delta$\emph{l} and $\delta$\emph{T}${}_c$ pinning coexist in FeTe${}_{0.6}$Se${}_{0.4}$ single crystal.

6 pages, 5 figures

References in corpus (10)

• Superconductivity in Iron Compounds
• Incommensurate magnetic order in the alpha-Fe(Te,Se) superconductor systems
• Vortex phase diagram of Ba(Fe0.93Co0.07)2As2 single crystals
• Tuning the superconducting and magnetic properties in Fe_ySe_0.25Te_0.75 by varying the Fe-content
• Temperature and time scaling of the peak-effect vortex configuration in FeTe${}_{0.7}$Se${}_{0.3}$
• Magnetization Relaxation and Collective Vortex Pinning in the Fe-Based Superconductor SmFeAsO_0.9F_0.1
• Flux-dynamics associated with the Second Magnetisation Peak in iron-pnictide Ba_{1-x}K_xFe_2As_2
• Enhancement of critical current density and vortex activation energy in proton-irradiated Co-doped BaFe2As2
• Magnetization hysteresis and time decay measurements in FeSe${}_{0.50}$Te${}_{0.50}$ : Evidence for fluctuation in mean free path induced pinning
• Large, Homogeneous, and Isotropic Critical Current Density in Oxygen-Annealed Fe1+yTe0.6Se0.4 Single Crystal

Cited by in corpus (19)

• Critical current density, vortex dynamics, and phase diagram of FeSe single crystal
• Doping-dependent critical current properties in K, Co, and P-doped BaFe2As2 single crystals
• Multiband Effect and Possible Dirac Fermions in Fe${}_{1+y}$Te${}_{0.6}$Se${}_{0.4}$
• Review of annealing effects and superconductivity in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ superconductors
• Universal Lower Limit on Vortex Creep in Superconductors
• Enhancement of critical current density and mechanism of vortex pinning in H${}^{+}$-irradiated FeSe single crystal
• Effects of heavy-ion irradiation on FeSe
• Bulk Superconductivity in Fe1+yTe0.6Se0.4 Induced by Removal of Excess Fe
• Electronic transport properties and hydrostatic pressure effect of FeSe${}_{0.67}$Te${}_{0.33}$ single crystals free of phase separation
• Glassy Dynamics in a heavy ion irradiated NbSe2 crystal
• Doping Dependence of the Second Magnetization Peak, Critical Current Density and Pinning Mechanism in BaFe${}_{2-x}$Ni${}_x$As${}_2$ Pnictide Superconductors
• 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
• Deviation from canonical collective creep behavior in Li${}_{0.8}$Fe${}_{0.2}$OHFeSe
• Thickness-induced crossover from strong to weak collective pinning in exfoliated FeTe${}_{0.6}$Se${}_{0.4}$ thin films at 1 T
• Magneto-optical characterizations of FeTe${}_{0.5}$Se${}_{0.5}$ thin films with critical current density over 1 MA/cm${}^2$
• Direct Evidence of Two Superconducting Gaps in FeSe${}_{0.5}$Te${}_{0.5}$: SnS-Andreev Spectroscopy and Lower Critical Field
• Critical current density and vortex pinning mechanism of Lix(NH3)yFe2Te1.2Se0.8 single crystals
• Increase of critical current density in FeSe superconductor by strain effect