# Transport properties of Lix(NH3)yFe2(TezSe1-z)2 single crystals in the mixed state

## TL;DR

This study investigates the vortex dynamics and transport properties of Lix(NH3)yFe2(TezSe1-z)2 single crystals, revealing rich vortex phases, significant thermal fluctuations, and distinctive Hall effect behaviors in the mixed state.

## Contribution

It provides new insights into vortex phase diagrams and flux-flow behaviors in these iron-based superconductors, highlighting the role of thermal fluctuations and unique Hall effect scaling.

## Key findings

- Rich vortex phases observed in the systems.
- Broad vortex liquid regions in phase diagrams.
- No sign reversal of FFHE in Lix(NH3)yFe2Se2.

## Abstract

We study the electric transport properties of Lix(NH3)yFe2(TezSe1-z)2 single crystals with z= 0 and 0.6 in the mixed state. Thermally-activated flux-flow, vortex glass and flux-flow Hall effect (FFHE) behaviors are observed. Experimental results show that there are rich vortex phases existing in these systems and the vortex liquid states occupy broad regions of phase diagrams. Further analysis suggests that thermal fluctuation plays an important role in the vortex phase diagrams of Lix(NH3)yFe2(TezSe1-z)2. Moreover, for Lix(NH3)yFe2Se2, there is no sigh reversal of FFHE in the mixed state and a scaling behavior |rhoxy(mu0H)|=Arhoxx(mu0H)^beta with beta ~ 2.0 is observed.