Control of chiral orbital currents in a colossal magnetoresistance material

Yu Zhang, Yifei Ni, Hengdi Zhao, Sami Hakani, Feng Ye, Lance DeLong, Itamar Kimchi () and Gang Cao ()
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Yu Zhang: University of Colorado at Boulder
Yifei Ni: University of Colorado at Boulder
Hengdi Zhao: University of Colorado at Boulder
Sami Hakani: Georgia Institute of Technology
Feng Ye: Oak Ridge National Lab
Lance DeLong: University of Kentucky
Itamar Kimchi: Georgia Institute of Technology
Gang Cao: University of Colorado at Boulder

Nature, 2022, vol. 611, issue 7936, 467-472

Abstract: Abstract Colossal magnetoresistance (CMR) is an extraordinary enhancement of the electrical conductivity in the presence of a magnetic field. It is conventionally associated with a field-induced spin polarization that drastically reduces spin scattering and electric resistance. Ferrimagnetic Mn3Si2Te6 is an intriguing exception to this rule: it exhibits a seven-order-of-magnitude reduction in ab plane resistivity that occurs only when a magnetic polarization is avoided1,2. Here, we report an exotic quantum state that is driven by ab plane chiral orbital currents (COC) flowing along edges of MnTe6 octahedra. The c axis orbital moments of ab plane COC couple to the ferrimagnetic Mn spins to drastically increase the ab plane conductivity (CMR) when an external magnetic field is aligned along the magnetic hard c axis. Consequently, COC-driven CMR is highly susceptible to small direct currents exceeding a critical threshold, and can induce a time-dependent, bistable switching that mimics a first-order ‘melting transition’ that is a hallmark of the COC state. The demonstrated current-control of COC-enabled CMR offers a new paradigm for quantum technologies.

Date: 2022
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DOI: 10.1038/s41586-022-05262-3

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