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

Yu Zhang, Yifei Ni, Pedro Schlottmann, Rahul Nandkishore, Lance E. DeLong and Gang Cao ()
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Yu Zhang: University of Colorado at Boulder
Yifei Ni: University of Colorado at Boulder
Pedro Schlottmann: Florida State University
Rahul Nandkishore: University of Colorado at Boulder
Lance E. DeLong: University of Kentucky
Gang Cao: University of Colorado at Boulder

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract Chiral orbital currents (COC) underpin a novel colossal magnetoresistance in ferrimagnetic Mn3Si2Te6. 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, and (2) A current-sensitive scaling relation between the Hall conductivity σxy and the longitudinal conductivity σxx, namely, σxy ∝ σxxα with α reaching up to 5, which is exceptionally large compared to α ≤ 2 typical of all solids. The novel Hall responses along with a current-sensitive carrier density and a large Hall angle of 15% point to a giant, current-sensitive Hall effect that is unique to the COC state. Here, we show 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 COC Hall responses.

Date: 2024
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DOI: 10.1038/s41467-024-47823-2

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