Critical current density, vortex dynamics, and phase diagram of FeSe single crystal

Abstract

We present a comprehensive study of the vortex pinning and dynamics in a high-quality FeSe single crystal, which is free from doping introduced inhomogeneities and charged quasi-particle-scattering because of its innate superconductivity. Critical current density, $J_c$, is found to be almost isotropic, and reaches a value $\sim$ 3 $\times$ 10${}^4$ A/cm${}^2$ at 2 K (self-field) for both $H$ $\Vert$ $c$ and $ab$. The normalized magnetic relaxation rate $S$ (= $\mid$dln$M$/dln$t$$\mid$) shows a temperature insensitive plateau behavior in the intermediate temperature range with a relatively high creep rate ($S$ $\sim$ 0.02 under zero field), which is interpreted in the framework of the collective creep theory. A crossover from the elastic to plastic creep is observed, while the fish-tail effect is absent for both $H$ $\Vert$ $c$ and $ab$. Based on this observation, the origin of the fish-tail effect is also discussed. Combining the results of $J_c$ and $S$, vortex motion in FeSe single crystal is found to be dominated by sparse strong point-like pinning from nm-sized defects or imperfections. The weak collective pinning is also observed and proved in the form of large bundles. Besides, the vortex phase diagram of FeSe is also constructed and discussed.

arXiv comment7 pages, 5 figures

References in corpus (28)

• Superconductivity in Iron Compounds
• Superconductivity in single-layer films of FeSe with a transition temperature above 100 K
• Extreme Sensitivity of Superconductivity to Stoichiometry in FeSe (Fe1+dSe)
• Enhancement of superconducting transition temperature of FeSe by intercalation of a molecular spacer layer
• Field-induced superconducting phase of FeSe in the BCS-BEC cross-over
• Reemerging superconductivity at 48 K across quantum criticality in iron chalcogenides
• Plastic vortex-creep in YBa${}_2$Cu${}_3$O${}_{7-x}$ crystals
• Vortex phase diagram of Ba(Fe0.93Co0.07)2As2 single crystals
• Lack of coupling between superconductivity and orthorhombic distortion in stoichiometric single-crystalline FeSe
• Strong Pinning in High Temperature Superconductors
• Enhancement of Critical Current Densities in Co-Doped BaFe${}_2$As${}_2$ with Columnar Defects Introduced by Heavy-Ion Irradiation
• Density Functional Study of Excess Fe in Fe${}_{1+x}$Te: Magnetism and Doping
• 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
• Suppression of Superconductivity by Twin Boundaries in FeSe
• Temperature dependence of lower critical field Hc1(T) shows nodeless superconductivity in FeSe
• Dynamics and mechanism of oxygen annealing in Fe${}_{1+y}$Te${}_{0.6}$Se${}_{0.4}$ single crystal
• Critical fields, thermally-activated transport and critical current density of beta-FeSe single crystals
• Superconducting and normal phases of FeSe single crystals at high pressure
• 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
• Evidence for time-reversal symmetry breaking of the superconducting state near twin-boundary interfaces in FeSe
• Enhancement of critical current density and vortex activation energy in proton-irradiated Co-doped BaFe2As2
• Charge doping-induced quasiparticle scattering in iron-pnictide superconductors as probed by vortex pinning
• Crystal growth and superconductivity of FeSe_x
• Synthesis, crystal structure and magnetism of beta-Fe1.00(2)Se1.00(3) single crystals
• Magnetic relaxation and collective vortex creep in FeTe${}_{0.6}$Se${}_{0.4}$ single crystal
• Large, Homogeneous, and Isotropic Critical Current Density in Oxygen-Annealed Fe1+yTe0.6Se0.4 Single Crystal

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• Universal Lower Limit on Vortex Creep in Superconductors
• Gap structure of FeSe determined by field-angle-resolved specific heat measurements
• Nodal gaps in the nematic superconductor FeSe from heat capacity
• Observation of the in-plane magnetic field-induced phase transitions in FeSe
• Imaging anisotropic vortex dynamics in FeSe
• Effects of heavy-ion irradiation on FeSe
• Vortex phases and glassy dynamics in the highly anisotropic superconductor HgBa${}_2$CuO${}_{4+\delta }$
• Robust superconductivity and transport properties in (Li1-xFex)OHFeSe single crystals
• Electronic transport properties and hydrostatic pressure effect of FeSe${}_{0.67}$Te${}_{0.33}$ single crystals free of phase separation
• Vortex-lattice melting and paramagnetic depairing in the nematic superconductor FeSe
• Significant enhancement of critical current density in H+-intercalated FeSe single crystal
• Disorder-sensitive node-like small gap in FeSe
• Quasi two-dimensional nature of high-Tc superconductivity in iron-based (Li,Fe)OHFeSe
• 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
• Structural-transition-induced quasi two-dimensional Fermi surface in FeSe
• Deviation from canonical collective creep behavior in Li${}_{0.8}$Fe${}_{0.2}$OHFeSe
• Vortex dynamics in $\beta$-FeSe single crystals: effects of proton irradiation and small inhomogeneous stress
• In-plane p-wave coherence length in iron-based superconductors
• Critical current density and vortex pinning mechanism of Lix(NH3)yFe2Te1.2Se0.8 single crystals
• Coherence Length of Electronic Nematicity in Iron-Based Superconductors
• Increase of critical current density in FeSe superconductor by strain effect
• Depairing critical current density and the vortex-free state in FeSe nanobridges
• Tripling of the Superconducting Critical Current Density in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$ Retained After Pressure Release
• Higher critical currents yet faster vortex creep in EuBa${}_2$Cu${}_3$O${}_y$ films containing coherent artificial pinning centers