Thermally activated energy and flux flow Hall effect of Fe1+y(Te1-xSx)z

TL;DR

This study investigates the flux flow Hall effect and thermally activated energy in Fe(Te,S) single crystals under high magnetic fields, revealing a crossover in pinning regimes and specific Hall effect behaviors.

Contribution

It introduces a detailed analysis of flux flow Hall effect and thermally activated energy in Fe(Te,S) crystals, highlighting a crossover in pinning mechanisms and absence of Hall sign reversal.

Findings

Crossover from single-vortex to collective creep pinning with increasing magnetic field.

Different temperature dependence of TAE for H//ab and H//c.

No Hall sign reversal observed in the mixed state.

Abstract

Thermally activated flux flow (TAFF) and flux flow Hall effect (FFHE) of Fe(Te,S) single crystal in the mixed state are studied in magnetic fields up to 35 T. Thermally activated energy (TAE) is analyzed using conventional Arrhenius relation and modified TAFF theory which is closer to experimental results. The results indicate that there is a crossover from single-vortex pinning region to collective creep pinning region with increasing magnetic field. The temperature dependence of TAE is different for H//ab and H//c. On the other hand, the analysis of FFHE in the mixed state indicates that there is no Hall sign reversal. We also observe scaling behavior |Rhoxy(H)| = A*Rhoxx(H)^beta.