Current-sensitive Hall effect in a chiral-orbital-current state

Abstract

Chiral orbital currents (COC) underpin a novel colossal magnetoresistance (CMR) in ferrimagnetic Mn3Si2Te6 [1]. Here we report the Hall effect in the COC state which exhibits the following unprecedented features: (1) A sharp, current-sensitive peak in the magnetic field dependence of the Hall resistivity; (2) An unusually large Hall angle reaching up to 0.15 (comparable to the highest values yet reported); and (3) A current-sensitive scaling relation between the Hall conductivity sigma_xy and the longitudinal conductivity sigma_xx, namely, sigma_xy ~ sigma_xx^alpha with alpha ranging between 3 and 5, which is both sensitive to external current and exceptionally large compared to alpha < 2 typical of most solids. These anomalies point to a giant, current-sensitive Hall effect that is unique to the COC state. We argue that a magnetic field induced by the fully developed COC combines with the applied magnetic field to exert the greatly enhanced transverse force on charge carriers, which dictates the novel Hall responses. The COC Hall effect is unique, as it is generated and controlled via the interaction between intrinsic COC and applied external currents, which leads to novel transport phenomena of fundamental and technological significance and requires new physics for explanation.

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References in corpus (10)

• Spin chirality on a two-dimensional frustrated lattice
• Magnetic order and interactions in ferrimagnetic Mn3Si2Te6
• Control of chiral orbital currents in a colossal magnetoresistance material
• Strange electrical transport: Colossal magnetoresistance via avoiding fully polarized magnetization in ferrimagnetic insulator Mn3Si2Te6
• Polaronic transport and thermoelectricity in Mn${}_3$Si${}_2$Te${}_6$ single crystals
• Electrical Control of Structural and Physical Properties via Strong Spin-Orbit Interactions in Sr2IrO4
• Magnetic Structure and Spin Fluctuations in Colossal Magnetoresistance Ferrimagnet Mn3Si2Te6
• Large anomalous Hall angle in a topological semimetal candidate TbPtBi
• Covalency, correlations, and inter-layer interactions governing the magnetic and electronic structure of Mn${}_3$Si${}_2$Te${}_6$
• Anapole, chiral and orbital states in Mn3Si2Te6

Cited by in corpus (3)

• Transition between heavy-fermion strange metal and quantum spin liquid in a 4d-electron trimer lattice
• Impact of Thermal Effects on the Current-Tunable Electrical Transport in the Ferrimagnetic Semiconductor Mn${}_3$Si${}_2$Te${}_6$
• Emergent Inductance from Chiral Orbital Currents in a Bulk Ferrimagnet