Vortex-glass phase transition and superconductivity in an under- doped (Ba,K)Fe2As2 single crystal

Abstract

Measurements of magnetotransport and current-voltage (I-V) characteristics up to 9 T were used to investigate the vortex phase diagram of an under-doped Measurements of magnetotransport and current-voltage (I-V) characteristics up to 9 T were used to investigate the vortex phase diagram of an under-doped (Ba,K)Fe2As2 single crystal with Tc=26.2 K. It is found that the anisotropy ratio of the upper critical field Hc2 decreases from 4 to 2.8 with decreasing temperature from Tc to 24.8 K. Consistent with the vortex-glass theory, the I-V curves measured at H=9 T can be well scaled with the vortex-glass transition temperature of Tg=20.7 K and critical exponents z=4.1 and v=1. Analyses in different magnetic fields produced almost identical critical exponent values, with some variation in Tg, corroborating the existence of the vortex-glass transition in this under-doped (Ba,K)Fe2As2 single crystal up to 9 T. A vortex phase diagram is presented, based on the evolution of Tg and Hc2 with magnetic field.

23 pages, 7 figures. accepted in Phys. Rev. B

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Cited by in corpus (19)

• Very strong intrinsic supercurrent carrying ability and vortex avalanches in (Ba,K)Fe2As2 superconducting single crystals
• Evidence for dominant Pauli paramagnetic effect in the upper critical fields of a FeTe0.6Se0.4 superconductor
• Intrinsic pinning on structural domains in underdoped single crystals of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Psuedo-isotropic upper critical field in cobalt-doped SrFe2As2 epitaxial films
• Pauli-limiting effects in the upper critical fields of a clean LiFeAs single crystal
• Observation of the Josephson effect in Pb/(Ba,K)Fe2As2 single crystal junctions
• Fishtail effect and vortex dynamics in LiFeAs single crystals
• Doping-dependent critical current properties in K, Co, and P-doped BaFe2As2 single crystals
• Thin Film Growth and Device Fabrication of Iron-Based Superconductors
• In-situ fabrication of cobalt-doped SrFe2As2 thin films by using pulsed laser deposition with excimer laser
• Doping dependent Irreversible Magnetic Properties of Ba(Fe1-xCox)2As2 Single Crystals
• Critical current and vortex dynamics in single crystals of Ca(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Josephson effect between electron-doped and hole-doped iron pnictide single crystals
• Effective carrier type and field-dependence of the reduced-Tc superconducting state in SrFe(2-x)Ni(x)As2
• Evidence of a universal and isotropic 2Δ/kBTC ratio in 122-type iron pnictide superconductors over a wide doping range
• Magnetic field - dependent Labusch parameter in LiFeAs superconductor from Campbell penetration depth
• The magnetization of PrFeAsO${}_{0.60}$F$_{0.12} sueprconductor
• Vortex-glass transformation within the surface superconducting state of $\beta$-phase Mo${}_{1-x}$Re${}_x$ alloys
• Large increase of the anisotropy factor in the overdoped region of Ba(Fe${}_{1-x}$Ni${}_x$)${}_2$As${}_2$ as probed by fluctuation spectroscopy