Magnetic and transport properties of iron-platinum arsenide Ca10(Pt4-{\delta}As8)(Fe2-xPtxAs2)5 single crystal

TL;DR

This study investigates the superconducting and magnetic properties of a novel iron-platinum arsenide single crystal, revealing high critical current density, flux creep behavior, and anisotropic upper critical fields, with implications for superconductor applications.

Contribution

First comprehensive analysis of superconducting and magnetic properties of Ca10(Pt4-{ extdelta}As8)(Fe2-xPtxAs2)5 single crystals, including critical current density and flux dynamics.

Findings

High critical current density (~0.8×10^5 A/cm^2) at low temperatures.

Observation of fish-tail hysteresis loop indicating flux pinning.

Homogeneous current flow within the crystal confirmed by magneto-optical imaging.

Abstract

We report superconducting properties of single crystalline Ca10(Pt4-{\delta}As8)(Fe2-xPtxAs2)5 by X-ray diffraction, magnetization, resistivity, and magneto-optical imaging measurements. The magnetization measurements reveal fish-tail hysteresis loop and relatively high critical current density Jc ~ 0.8\times105 A/cm2 at low temperatures. The exponential temperature dependence of Jc, which arises from nonlinear effective flux-creep activation energy, has been observed. Upper critical field determined by resistive transition shows a relatively large anisotropy. The magneto-optical images reveal homogenous current flow within the crystal.