Fluctuation magnetoconductivity in pristine and protonirradiated Ca8.5La1.5(Pt3As8)(Fe2As2)5 single crystals

TL;DR

This study investigates how proton irradiation affects fluctuation-induced magnetoconductivity in Ca8.5La1.5(Pt3As8)(Fe2As2)5 single crystals, revealing suppression of Tc and changes in fluctuation dimensionality.

Contribution

It provides new insights into the impact of proton irradiation on fluctuation regimes and dimensional crossover in this iron-based superconductor.

Findings

Proton irradiation suppresses Tc from 32.5 K to 30.3 K.

The pristine sample exhibits a 3D-2D crossover near Tc.

Irradiated samples show only 3D fluctuation behavior.

Abstract

The influence of the proton irradiation on the thermally fluctuation-induced conductivity in Ca8.5La1.5(pt3As8)(Fe2As2)5 single crystal was investigatyed. The in-plane magnetoconductivity was measured up to H=13T. It is observed that the Tc was suppressed up to 30.3 from 32.5 K when the proton is irradiated whereas the amplitude of the fluctuation effect is the almost same in both samples. The results were analyzed by the Ullah and Dorsey scaling functions based on the Hartree approximation to the Ginzburg-Landau free energy, including the critical-fluctuation regime. In the pristine sample, the 3D-2D crossover in the fluctuation effect was observed near the Tc. When the 3D-2D occurs, it is newly found that there is a regime simultaneously described by 2D and 3D fluctuation behaviors. Meanwhile, the proton-irradiated sample showed the 3D fluctuation.