# Melting of vortex lattice in magnetic superconductor $\mathrm{Rb}\mathrm{Eu}\mathrm{Fe}_{4}\mathrm{As}_{4}$

## TL;DR

This study investigates vortex lattice melting in the magnetic superconductor RbEuFe4As4, revealing fluctuation effects and vortex behavior consistent with theoretical models, and comparing it to other superconductors.

## Contribution

First detailed calorimetric and transport analysis of vortex-lattice melting in RbEuFe4As4, aligning experimental results with theoretical predictions without fitting parameters.

## Key findings

- Vortex-lattice melting observed as resistivity drop and specific heat step.
- Melting line lies below the upper-critical-field line.
- Thermal vortex fluctuations are less prominent than in cuprates.

## Abstract

The iron-based superconductors are characterized by strong fluctuations due to high transition temperatures and small coherence lengths. We investigate fluctuation behavior in the magnetic iron-pnictide superconductor $\mathrm{Rb}\mathrm{Eu}\mathrm{Fe}_{4}\mathrm{As}_{4}$ by calorimetry and transport. We find that the broadening of the specific-heat transition in magnetic fields is very well described by the lowest-Landau-level scaling. We report calorimetric and transport observations for vortex-lattice melting, which is seen as a sharp drop of the resistivity and a step of the specific heat at the magnetic-field-dependent temperature. The melting line in the temperature/magnetic-field plane lies noticeably below the upper-critical-field line and its location is in quantitative agreement with theoretical predictions without fitting parameters. Finally, we compare the melting behavior of $\mathrm{Rb}\mathrm{Eu}\mathrm{Fe}_{4}\mathrm{As}_{4}$ with other superconducting materials showing that thermal fluctuations of vortices are not as prevalent as in the high-temperature superconducting cuprates, yet they still noticeably influence the properties of the vortex matter.