Tuning the electronic band structure in a kagome ferromagnetic metal via magnetization

Abstract

Materials with zero energy band gap display intriguing properties including high sensitivity of the electronic band structure to external stimulus such as pressure or magnetic field. An interesting candidate for zero energy band gap are Weyl nodes at the Fermi level EF. A prerequisite for the existence of Weyl nodes is to either have inversion or time reversal symmetry broken. Weyl nodes in systems with broken time reversal symmetry are ideal to realize the tunability of the electronic band structure by magnetic field. Theoretically, it has been shown that in ferromagnetic Weyl materials, the band structure is dependent upon the magnetization direction and thus the electronic bands can be tuned by controlling the magnetization direction. Here, we demonstrate tuning of the band structure in a kagome Weyl ferromagnetic metal Fe3Sn2 with magnetization and magnetic field. Owing to spin-orbit coupling, we observe changes in the band structure depending on the magnetization direction that amount to a decrease in the carrier density by a factor of four when the magnetization lies in the kagome plane as compared to when the magnetization is along the c axis. Our discovery opens a way for tuning the carrier density in ferromagnetic materials.

10 pages, 5 figures

References in corpus (7)

• Quantum oscillations, thermoelectric coefficients and the Fermi surface of semi-metallic WTe2
• Anomalous Hall effect of ferromagnetic Fe3Sn2 single crystal with geometrically frustrated kagome lattice
• On the anisotropies of magnetization and electronic transport of magnetic Weyl semimetal Co3Sn2S2
• Quantum Metamagnetic Transitions Induced by Changes in Fermi-Surface Topology -Applications to a Weak Itinerant-Electron Ferromagnet;ZrZn_2
• Fermi surface manipulation by external magnetic field demonstrated for a prototypical ferromagnet
• Correlation of Crystal Quality and Extreme Magnetoresistance of WTe${}_2$
• Anomalous planar Hall effect in a kagome ferromagnet

Cited by in corpus (4)

• Orbital Magneto-Nonlinear Anomalous Hall Effect in Kagome Magnet Fe${}_3$Sn${}_2$
• Anomalous quasiparticles in the zone center electron pocket of the kagomé ferromagnet Fe3Sn2
• Spin waves and orbital contribution to ferromagnetism in a topological metal
• Magnetization-Tunable Topological Phase Transitions in Ferromagnetic Kagome Monolayers of Co${}_3$X${}_3$Y${}_2$ ($X=\mathrm{Sn},\mathrm{Pb}$; $Y=\mathrm{S},\mathrm{Se}$)