Putative helimagnetic phase in the kagome metal Co_3Sn_2-xIn_xS_2

Abstract

The exploration of topological electronic phases that result from strong electronic correlations is a frontier in condensed matter physics. One class of systems that is currently emerging as a platform for such studies are so-called kagome magnets based on transition metals. Using muon spin-rotation, we explore magnetic correlations in the kagome magnet Co${}_3$Sn${}_{2-x}$In${}_x$S${}_2$ as a function of In-doping, providing putative evidence for an intriguing incommensurate helimagnetic (HM) state. Our results show that, while the undoped sample exhibits an out-of-plane ferromagnetic (FM) ground state, at 5 $\%$ of In-doping the system enters a state in which FM and in-plane antiferromagnetic (AFM) phases coexist. At higher doping, a HM state emerges and becomes dominant at the critical doping level of only $x_{\mathrm{cr},1}$ $\simeq$ 0.3. This indicates a zero temperature first order quantum phase transition from the FM, through a mixed state, to a helical phase at $x_{\mathrm{cr},1}$. In addition, at $x_{\mathrm{cr},2}$ $\simeq$ 1, a zero temperature second order phase transition from helical to paramagnetic phase is observed, evidencing a HM quantum critical point (QCP) in the phase diagram of the topological magnet Co${}_3$Sn${}_{2-x}$In${}_x$S${}_2$. The observed diversity of interactions in the magnetic kagome lattice drives non-monotonous variations of the topological Hall response of this system.

arXiv comment16 pages, 8 figures. This work builds on our earlier finding on Co3Sn2S2, arXiv:1904.09353, and expands our findings to Co3Sn2-xInxS2

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Cited by in corpus (12)

• Large anomalous Hall effect in single crystals of the kagome Weyl ferromagnet Fe${}_3$Sn
• Hidden local symmetry breaking in a kagome-lattice magnetic Weyl semimetal
• Electronic structure evolution of the magnetic Weyl semimetal Co${}_3$Sn${}_2$S${}_2$ with hole and electron doping
• Spin structure and dynamics of the topological semimetal Co${}_3$Sn${}_{2-x}$In${}_x$S${}_2$
• Self-consistent Analysis of Doping Effect for Magnetic Ordering in Stacked-Kagome Weyl System
• Tuning the anomalous Nernst and Hall effects with shifting the chemical potential in Fe-doped and Ni-doped Co${}_3$Sn${}_2$S${}_2$
• Spin-flop quasi metamagnetic, anisotropic magnetic, and electrical transport behavior of Ho substituted kagome magnet ErMn${}_6$Sn${}_6$
• Field Orientation Dependent Magnetic Phases In Weyl Semimetal Co3Sn2S2
• Rich Magnetic Phase Diagram of Putative Helimagnet Sr${}_3$Fe${}_2$O${}_7$
• Magnetic properties and field-induced phenomena in the Jeff = 1/2 distorted kagome antiferromagnet
• Electron-doped magnetic Weyl semimetal LixCo3Sn2S2 by bulk-gating
• In-plane Antiferromagnetism in Ferromagnetic Kagome Semimetal Co3Sn2S2