Superconductivity of powder-in-tube LaO0.9F0.1FeAs wires

TL;DR

This paper reports the successful fabrication of LaO0.9F0.1FeAs superconducting wires using a powder-in-tube method, demonstrating a convenient synthesis process with promising microstructure and a transition temperature around 25 K.

Contribution

It introduces a novel powder-in-tube fabrication method for LaO0.9F0.1FeAs wires, offering a safer and more convenient alternative to traditional synthesis techniques.

Findings

Successful fabrication of LaO0.9F0.1FeAs wires with a transition temperature of 25 K

Homogeneous microstructure with 1-3 micrometer grain size

PIT method shows promise for high-quality iron-based superconductor wires

Abstract

We demonstrate that Fe sheathed LaO0.9F0.1FeAs wires with Ti as a buffer layer were successfully fabricated by the powder-in-tube (PIT) method. Comparing to the common two-step vacuum quartz tube synthesis method, the PIT method is more convenient and safe for synthesizing the novel iron-based layered superconductors. Structural analysis by mean of x-ray diffraction shows that the main phase of LaO0.9F0.1FeAs was obtained by this synthesis method. The transition temperature of the LaO0.9F0.1FeAs wire is around 25 K. The micrograph shows a homogeneous microstructure with a grain size of 1-3 micrometers. The results suggest that the PIT process is promising in preparing high-quality iron-based layered superconductor wires.