Superconducting and magnetic properties of a new EuAsFeO0.85F0.15 superconductor

TL;DR

This study reports the synthesis and characterization of a new EuAsFeO0.85F0.15 superconductor with an 11K critical temperature, analyzing its magnetic and electric properties under various magnetic fields.

Contribution

It introduces a new Eu-based iron-oxide superconductor and provides detailed measurements of its critical fields, penetration depth, and coherence length, expanding understanding of rare-earth doped superconductors.

Findings

Critical temperature Tc=11K established.

Critical magnetic fields Hc1 and Hc2 measured.

Hyperbolic temperature dependence of Hc2 observed.

Abstract

Polycrystalline samples of a new superconducting EuAsFeO0.85F0.15 compound with critical temperature Tc=11K were prepared by solid state synthesis. Its electric and magnetic properties have been investigated in magnetic fields from 0.1 to 140000 Oe. Critical magnetic fields Hc1, and Hc2 were measured and hence the magnetic penetration depths and the coherence length have been estimated. The temperature dependence Hc2 (T) exhibits clear hyperbolic - type behavior starting with the lowest fields. The data derived were used to estimate probable high Tc and Hc2 in compounds doped with rare-earths having small atomic radii.