Thermally activated flux flow of vortex liquid and suppression of vortex glass in Ca10(Pt4As8)(Fe2As2)5

Abstract

To investigate the presence and role of magnetic fluctuations below the superconducting transition temperature in Ca10(Pt4As8)(Fe2As2)5 superconductors, which exhibit static non-magnetic behavior and linear temperature-dependent electrical resistivity in the normal state, we conducted detailed measurements of electrical resistivity under magnetic fields applied along the c-axis (H//c) and the ab-plane (H//ab) to analyze the vortex creep behavior. For H//c, vortex liquid and low-temperature vortex glass phases were observed, similar to those in typical iron pnictide superconductors. In contrast, for H//ab, no vortex glass phase was observed at low temperatures, but instead, a vortex liquid phase extended over a wide temperature range was observed. This behavior has never been reported in iron pnictide systems. This suppression of the vortex glass phase is attributed to the presence of antiferromagnetic fluctuations within the superconducting dome. © 2025 Elsevier Ltd