Giant increase in critical current density of KxFe2-ySe2 single crystals

Abstract

By using post-annealing and quenching technique, we show that the critical current density Jc,ab of KxFe2-ySe2 single crystals can be enhanced more than one order of magnitude up to ~ 2.1 \times 10^4 A/cm^2 at 1.8 K. The scaling law between normalized pinning force and reduced field for all measured temperatures was observed, reflecting the presence of only one dominant pinning mechanism. Analysis indicates presence of 3D point-like normal core pinning sources in quenched KxFe2-ySe2 samples whereas dominant vortex interaction with pinning centers is via spatial variations in Tc ("deltaTc pinning").

3 figures, 4 pages

References in corpus (11)

• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• Superconductivity and Phase Diagram in the Iron-based Arsenic-oxides ReFeAsO1-delta (Re = rare earth metal) without F-Doping
• Very High Field Two-Band Superconductivity in LaFeAsO_0.89F_0.11
• Nearly Isotropic superconductivity in (Ba,K)Fe2As2
• Small anisotropy, weak thermal fluctuations, and high field superconductivity in Co-doped iron pnictide Ba(Fe1-xCox)2As2
• Vortex phase diagram of Ba(Fe0.93Co0.07)2As2 single crystals
• Fishtail effect and the vortex phase diagram of single crystal Ba0.6K0.4Fe2As2
• Anisotropic Hc2 of K0.8Fe1.76Se2 determined up to 60 T
• Anisotropy in transport and magnetic properties of K0.64Fe1.44Se2
• Anisotropic magnetism, resistivity, London penetration depth and magneto-optical imaging of superconducting K0.80Fe1.76Se2 single crystals
• Critical current density and mechanism of vortex pinning in KxFe2-ySe2 doped with S

Cited by in corpus (14)

• Ultra-high critical current densities, the vortex phase diagram and the effect of granularity of the stoichiometric high-Tc superconductor, CaKFe${}_4$As${}_4$
• Evolution of precipitate morphology during heat treatment and its implications for the superconductivity in KxFe1.6+ySe2 single crystals
• One-step synthesis of KxFe2-ySe2 single crystals for high critical current density
• Flux jumps and vortex pinning in Ba${}_{0.65}$Na${}_{0.35}$Fe${}_2$As${}_2$ single crystals
• Superconductivity and magnetism in RbxFe2-ySe2: Impact of thermal treatment on mesoscopic phase separation
• Critical current density and vortex pinning in tetragonal FeS${}_{1-x}$Se${}_x$ ($x=0,0.06$)
• Robust superconductivity and transport properties in (Li1-xFex)OHFeSe single crystals
• Significant enhancement of critical current density in H+-intercalated FeSe single crystal
• Correlated disorder to order crossover in the local structure of K${}_x$Fe${}_{2-y}$Se${}_{2-z}$S${}_z$
• Evolution of superconductivity in isovalent Te-substituted KxFe2-ySe2 crystals
• Critical current density and vortex pinning mechanism of Lix(NH3)yFe2Te1.2Se0.8 single crystals
• Evidence of superconductivity-induced phonon spectra renormalization in alkali-doped iron selenides
• Annealing Effect on Microstructure and Superconductivity of KxFeySe2 Synthesized by an Easy One-step Method
• Multiband behavior and non-metallic low-temperature state of K${}_{0.50}$Na${}_{0.24}$Fe${}_{1.52}$Se${}_2$