Anisotropies and Homogeneities of Superconducting Properties in Iron-Platinum-Arsenide Ca10(Pt3As8)(Fe1.79Pt0.21As2)5

TL;DR

This study investigates the anisotropic superconducting properties of Ca10(Pt4-{ extdelta}As8)(Fe1.79Pt0.21As2)5 single crystals, revealing anisotropy in critical fields, current densities, and homogeneity of current flow within the ab-plane.

Contribution

It provides detailed measurements of anisotropic superconducting parameters and demonstrates the homogeneity of current flow in this iron-platinum-arsenide compound.

Findings

Critical current densities are approximately 0.9×10^5 and 0.7×10^5 A/cm² at 5 K.

Anisotropy of the upper critical field is relatively large.

Magneto-optical imaging shows homogeneous current flow within the ab-plane.

Abstract

We report a study on the anisotropy of superconducting properties in single crystalline Ca10(Pt4-{\delta}As8)(Fe1.79Pt0.21As2)5 with Tc ~13.6 K. Under a field of 5 Oe, the sample reaches fully-diamagnetic state at ~10 K for H//c, and ~8 K for H//ab, indicating the presence of slight inhomogeneities. The magnetization measurements reveal fish-tail effect in the hysteresis loop for both H//c and H//ab. Averaged critical current densities at low magnetic fields along the c-axis and ab-plane Jc(H//c) and Jc(H//ab) at 5 K are estimated to be 0.9*10^5 and 0.7*10^5 A/cm2, respectively. Resistive transitions under magnetic field show broadening, which is consistent with a relatively large anisotropy of upper critical field. Magneto-optical images reveal homogenous current flow within the ab-plane.