Low-temperature synthesis of SmFeAsO0.7F0.3 wires with high transport critical current density

Abstract

Ag-sheathed SmFeAsO0.7F0.3 (Sm-1111) superconducting wires were prepared by a one-step solid state reaction at temperatures as low as 850~900C, instead of commonly used temperatures of 1150~1250C. The X-ray diffraction pattern of the as-sintered samples is well indexed on the basis of tetragonal ZrCuSiAs-type structure. We characterized transport critical current density Jc of the SmFeAsO0.7F0.3 wires in increasing and subsequently decreasing fields, by a resistive four-probe method. A transport Jc as high as ~1300 A/cm^2 at 4.2 K and self field has been observed for the first time in Sm-1111 type polycrystalline superconductors. The Jc also shows a rapid depression in small applied fields as well as a magnetic-history dependence, indicating weak-linked grain boundaries. The low-temperature synthesis method can be very beneficial to fabricating the RE-1111 iron oxynictides in a convenient and safe way.

12 pages, 3 figures

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Cited by in corpus (13)

• High intergrain critical current density in fine-grain (Ba0.6K0.4)Fe2As2 wires and bulks
• Large Transport Critical Current Densities of Ag Sheathed (Ba,K)Fe2As2+Ag Superconducting Wires Fabricated by an ex-situ Powder-in-Tube (PIT) Process
• Thin Film Growth and Device Fabrication of Iron-Based Superconductors
• Effective Ex-Situ Fabrication of F-Doped SmFeAsO Wire for High Transport Critical Current Density
• Development of Powder-in-Tube Processed Iron Pnictide Wires and Tapes
• Fabrication of binary FeSe superconducting wires by novel diffusion process
• Low-temperature Synthesis of FeTe0.5Se0.5 Polycrystals with a High Transport Critical Current Density
• Enhancement of transport critical current density of SmFeAsO1-xFx tapes fabricated by an ex-situ powder-in-tube method with a Sn-presintering process
• Crystal structure instability of FeSe grains: Formation of non-superconducting phase at the grain surface
• Density effect on critical current density and flux pinning properties of polycrystalline SmFeAsO1-xFx superconductor
• Analysis of interdiffusion between SmFeAsO0.92F0.08 and metals for ex situ fabrication of superconducting wire
• Calculation of the transport critical current density of c-axis textured 122 iron-based superconductors
• Effects of the sintering atmosphere on the superconductivity of SmFeAsO1-xFx compounds