High magnetic field scales and critical currents in SmFeAs(O,F) crystals: promising for applications

Abstract

Superconducting technology provides most sensitive field detectors, promising implementations of qubits and high field magnets for medical imaging and for most powerful particle accelerators. Thus, with the discovery of new superconducting materials, such as the iron pnictides, exploring their potential for applications is one of the foremost tasks. Even if the critical temperature Tc is high, intrinsic electronic properties might render applications rather difficult, particularly if extreme electronic anisotropy prevents effective pinning of vortices and thus severely limits the critical current density, a problem well known for cuprates. While many questions concerning microscopic electronic properties of the iron pnictides have been successfully addressed and estimates point to a very high upper critical field, their application potential is less clarified. Thus we focus here on the critical currents, their anisotropy and the onset of electrical dissipation in high magnetic fields up to 65 T. Our detailed study of the transport properties of optimally doped SmFeAs(O,F) single crystals reveals a promising combination of high (>2 x 10^6 A/cm^2) and nearly isotropic critical current densities along all crystal directions. This favorable intragrain current transport in SmFeAs(O,F), which shows the highest Tc of 54 K at ambient pressure, is a crucial requirement for possible applications. Essential in these experiments are 4-probe measurements on Focused Ion Beam (FIB) cut single crystals with sub-μ\m^2 cross-section, with current along and perpendicular to the crystallographic c-axis and very good signal-to-noise ratio (SNR) in pulsed magnetic fields. The pinning forces have been characterized by scaling the magnetically measured "peak effect".

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• Th substituted SmFeAsO: structural details and superconductivity with Tc above 50 K
• Thin Film Growth and Device Fabrication of Iron-Based Superconductors
• Intrinsic Josephson junctions in the iron-based multi-band superconductor (V2Sr4O6)Fe2As2
• Enhancement of critical current densities in (Ba,K)Fe2As2 wires and tapes using HIP technique
• Anisotropic Phase Diagram and Superconducting Fluctuations in SmFeAsO0.85F0.15
• Field induced density wave in the heavy fermion compound CeRhIn5
• Vortex dynamics and irreversibility line in optimally doped SmFeAsO${}_{0.8}$F${}_{0.2}$ from ac susceptibility and magnetization measurements
• Anisotropy of strong pinning in multi-band superconductors
• Superconductivity with High Upper Critical Field in the Cubic Centrosymmetric $\eta$-Carbide Nb${}_4$Rh${}_2$C${}_{1-\delta }$
• The effect of exceptionally high fluorine doping on the anisotropy of single crystalline SmFeAsO1-xFx
• Magnetoresistance and anomalous Hall effect in micro-ribbons of the magnetic Weyl semimetal Co${}_3$Sn${}_2$S${}_2$
• Giant enhancement in critical current density, up to a hundredfold, in superconducting NaFe0.97Co0.03As single crystals under hydrostatic pressure
• Superconductivity and Dirac Fermions in 112-phase Pnictides
• Growth of whisker-like and bulk single crystals of PrFeAs(O,F) under high pressure
• Interplay of composition, structure, magnetism, and superconductivity in SmFeAs1-xPxO1-y
• Anisotropy of the coherence length from critical currents in the stoichiometric superconductor LiFeAs
• Heavy Electron doping-induced antiferromagnetic phase as the parent for iron-oxypnictide superconductor LaFeAsO1-xHx
• Achieving the depairing limit along $c$ axis in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ single crystals
• Conventional superconductivity and hysteretic Campbell penetration depth in single crystals MgCNi${}_3$
• {Rearrangement of the antiferromagnetic ordering at high magnetic fields in SmFeAsO and SmFeAsO${}_{0.9}$F${}_{0.1}$ single crystals
• Superconductivity-driven ferromagnetism and spin manipulation using vortices in the magnetic superconductor EuRbFe4As4
• Giant enhancement of critical current density at high field in superconducting (Li,Fe)OHFeSe films by Mn doping
• Comparative study of superconducting and normal-state anisotropy in Fe${}_{1+y}$Te${}_{0.6}$Se${}_{0.4}$ superconductors with controlled amounts of interstitial excess Fe
• High pressure growth and electron transport properties of superconducting SmFeAsO1-xHx single crystals
• Density effect on critical current density and flux pinning properties of polycrystalline SmFeAsO1-xFx superconductor
• High superconducting anisotropy and weak vortex pinning in Co doped LaFeAsO
• Critical current oscillations in the intrinsic hybrid vortex state of SmFeAs(O,F)
• Microstructuring YbRh2Si2 for resistance and noise measurements down to ultra-low temperatures
• Inter- to Intra-Layer Resistivity Anisotropy of NdFeAs(O,H) with Various Hydrogen Concentrations
• Emergent Edge Modes in Shifted Quasi-One-Dimensional Charge Density Waves
• Vortex lock-in transition and evidence for transitions among commensurate kinked vortex configurations in single-layered Fe arsenides
• Anisotropy of the transport properties of NdFeAs(O,F) thin films grown on vicinal substrates
• Superconducting and critical properties of PrOFe0.9Co0.1As: effect of P doping
• Critical fields and fluctuations determined from specific heat and magnetoresistance in the same nanogram SmFeAs(O,F) single crystal
• Increase of critical current density in FeSe superconductor by strain effect
• Vortex matter and strong pinning in underdoped PrFeAs(O,F) with atomic-sized defects
• Effects of the sintering atmosphere on the superconductivity of SmFeAsO1-xFx compounds
• Electronic correlations and topology in Kondo insulator PuB${}_6$