Magnetotransport in Fe-intercalated \textit{T}S${}_2$: the comparison between \textit{T} = Ti and Ta

Abstract

Sharp magnetization switching and large magnetoresistance were previously discovered in single crystals of 2H-Fe${}_x$TaS${}_2$ and attributed to the Fe superstructure and its defects. We report similar sharp switching in 1T-Fe${}_x$TiS${}_2$ ($0.086\le x\le 0.703$) and the discovery of large magnetoresistance. The switching field $H_s$ and magnetoresistance are similar to 2H-Fe${}_x$TaS${}_2$, with a larger than expected bowtie magnetoresistance and a sharp hysteresis loop. Despite previous reports, electron diffraction shows only the $\sqrt{3}\times \sqrt{3}$ superstructure in 1T-Fe${}_x$TiS${}_2$. The Curie and Weiss temperatures remain roughly constant below $x\sim 1/3$ before monotonically increasing for higher x. By contrast, the switching field and magnetoresistance reach a maximum where defects in the superstructure exist, approach a minimum near perfect superstructures, and remain constant above $x\sim 0.4$. Additionally, an increase in $H_s$ with annealing time is reported. Glassy behavior is shown to coexist within the ferromagnetic state in 1T-Fe${}_x$TiS${}_2$ for compositions between $0.1$ and $0.703$. A simple model captures the essential phenomenology and explains most similarities and differences between 1T-Fe${}_x$TiS${}_2$ and 2H-Fe${}_x$TaS${}_2$, and provides insights into other magnetically intercalated transition metal dichalcogenides.

References in corpus (6)

• Titanic Magnetoresistance in WTe2
• Ferromagnetic cluster spin-glass behavior in PrRhSn3
• Tuning the Charge Density Wave and Superconductivity in CuxTaS2
• Very large magnetoresistance in Fe${}_{0.28}$TaS${}_2$ single crystals
• Local-moment ferromagnetism and unusual magnetic domains in Fe${}_{1/4}$TaS${}_2$ crystals
• Sharp switching of the magnetization in Fe1/4TaS2

Cited by in corpus (2)

• Electrical and thermal transport in van der Waals magnets 2H-M${}_x$TaS${}_2$ (M = Mn, Co)
• Ferromagnetism in layered metallic Fe1/4TaS2 in the presence of conventional and Dirac carriers