Evidence for electromagnetic granularity in the polycrystalline iron-based superconductor LaO0.89F0.11FeAs

Abstract

The new rare-earth arsenate superconductors are layered, low carrier density compounds with many similarities to the high-Tc cuprates. An important question is whether they also exhibit weak-coupling across randomly oriented grain-boundaries. In this work we show considerable evidence for such weak-coupling by study of the dependence of magnetization in bulk and powdered samples. Bulk sample magnetization curves show very little hysteresis while remanent magnetization shows almost no sample size dependence, even after powdering. We conclude that these samples exhibit substantial electromagnetic granularity on a scale approximating the grain size, though we cannot yet determine whether this is intrinsic or extrinsic.

3 pages, 6 figures

References in corpus (11)

• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• Superconductivity in iron-based F-doped layered quaternary compound Nd[O1-xFx]FeAs
• Very High Field Two-Band Superconductivity in LaFeAsO_0.89F_0.11
• Superconductivity at 52 K in iron-based F-doped layered quaternary compound Pr[O1-xFx]FeAs
• Proximity of antiferromagnetism and superconductivity in LaO${}_{1-x}$F${}_x$FeAs: effective Hamiltonian from ab initio studies
• Doping-dependent Phase Diagram of LaO{\it M}As ({\it M}=V--Cu) and Electron-type Superconductivity near Ferromagnetic Instability
• Electron Correlations in the Low Carrier Density LaFeAsO0.89F0.11 Superconductor (Tc = 28 K)
• Field and Temperature Dependence of the Superfluid Density in LaO_{1-x}F_xFeAs Superconductors: A Muon Spin Relaxation Study
• 19-F NMR Investigation of Iron-pnictide Superconductor LaFeAsO(0.89)F(0.11)
• Linear Temperature Dependence of the Lower Critical Field $H_{c1}$ in F-Doped LaOFeAs Superconductors
• Evidence for the Spin Density Wave in LaFeAsO

Cited by in corpus (31)

• Recent advances in iron-based superconductors toward applications
• Small anisotropy, weak thermal fluctuations, and high field superconductivity in Co-doped iron pnictide Ba(Fe1-xCox)2As2
• Upper critical fields and thermally-activated transport of Nd(O_0.7F_0.3)FeAs single crystal
• Exploration of new superconductors and functional materials and fabrication of superconducting tapes and wires of iron pnictides
• New Fe-based superconductors: properties relevant for applications
• Vortex phase diagram of Ba(Fe0.93Co0.07)2As2 single crystals
• The behavior of grain boundaries in the Fe-based superconductors
• Comparative High Field Magneto-Transport of Rare Earth Oxypnictides with Maximum Transition Temperatures
• Upper critical fields well above 100 T for the superconductor SmFeAsO${}_{0.85}$F${}_{0.15}$ with T${}_c$ = 46 K
• Evidence for two distinct scales of current flow in polycrystalline Sm and Nd iron oxypnictides
• High transport current superconductivity in powder-in-tube Ba0.6K0.4Fe2As2 tapes at 27 tesla
• Intergrain current flow in a randomly oriented polycrystalline SmFeAsO0.85 oxypnictide
• Intrinsic magnetic properties of NdFeAsO${}_{0.9}$F${}_{0.1}$ superconductor from local and global measurements
• Strong vortex pinning in Co-doped BaFe2As2 single crystal thin films
• Superconductivity of powder-in-tube Sr0.6K0.4Fe2As2 wires
• High transport critical current densities in textured Fe-sheathed Sr1-xKxFe2As2+Sn superconducting tapes
• Combined microstructural and magneto optical study of current flow in polycrystalline forms of Nd and Sm Fe-oxypnictides
• Mechanochemical synthesis of pnictide compounds and superconducting Ba0.6K0.4Fe2As2 bulks with high critical current density
• Development of very high Jc in Ba(Fe1-xCox)2As2 thin films grown on CaF2
• Grain boundary characteristics of Fe-based superconductors
• Artificial and self-assembled pinning centers in Ba(Fe1-xCox)2As2 thin films as a route to very high current density
• Transition Temperature and Upper Critical Field in SmFeAsO1-xFx Synthesized at Low Heating Temperatures
• Evidence for electromagnetic granularity in polycrystalline Sm1111 iron-pnictides with enhanced phase purity
• Enhancement in transition temperature and critical current density of CeO0.8F0.2FeAs by yttrium doping
• The magnetization of PrFeAsO${}_{0.60}$F$_{0.12} sueprconductor
• Anomalous Tail Effect on Resistivity Transition and Weak-link Behavior of Iron Based Superconductor
• Aligned crystallite powder of NdFeAsO${}_{0.86}$F${}_{0.14}$: magnetic hysteresis and penetration depth
• Effect of spark plasma sintering on the superconducting properties of Sm-based oxypnictide
• Electromagnetic response of LaO_0.94F_0.06FeAs: AC susceptibility and microwave surface resistance
• Superconducting and critical properties of PrOFe0.9Co0.1As: effect of P doping
• High critical current density and low anisotropy in textured Sr1-xKxFe2As2 tapes for high field applications