Multiple Magnetic Phases and Anomalous Hall Effect in Sb1.9Fe0.1Te2.85S0.15 Topological Insulators

Due to fundamental and technological concerns, investigating materials with topological magnetic structures has always been a focus of significant research. We explored Sb1.9Fe0.1Te2.S-85(0.15) where a unique combination of disordered glassy phases, competitive FM-AFM interactions, and nontrivial surface state coexisted at the same time. We have discussed the impact of those complicated magnetic phases upon the observed AHE in Sb1.9Fe0.1Te2.S-85(0.15) with magneto-transport studies. The AC susceptibility results demonstrate a shift in the freezing temperature with excitation frequency, the comprehensive analysis verifies the slower dynamics, and a nonzero Vogel-Fulcher temperature T-0 suggests cluster spin glass. This, together with an intermediate value of the Mydosh parameter, provides an evidence for the formation of a cluster spin glass state in the present system. Topological frustrated magnets, which can host both magnetic frustrations and Dirac quasi-particles, are highly sought after class of compounds. Furthermore, as seen by the de Haas-van Alphen (dHvA) oscillation study, the fermiology deviates with doping and produces multiple Fermi pockets, revealing a rich complexity in the underlying electronic structure.

Automated summary

Investigating materials with topological magnetic structures is important due to fundamental and technological concerns. In this study, we explored the properties of Sb1.9Fe0.1Te2.S-85(0.15) and found a unique combination of disordered glassy phases, competitive FM-AFM interactions, and nontrivial surface state. Our magneto-transport studies revealed the impact of these complicated magnetic phases on the observed anomalous Hall effect. AC susceptibility results showed a shift in freezing temperature, slower dynamics, and evidence of a cluster spin glass state in the system. Additionally, the de Haas-van Alphen (dHvA) oscillation study revealed a rich complexity in the underlying electronic structure with multiple Fermi pockets.