Control of chiral orbital currents in a colossal magnetoresistance
material
- URL: http://arxiv.org/abs/2209.08672v1
- Date: Sun, 18 Sep 2022 22:53:21 GMT
- Title: Control of chiral orbital currents in a colossal magnetoresistance
material
- Authors: Yu Zhang, Yifei Ni, Hengdi Zhao, Sami Hakani, Feng Ye, Lance DeLong,
Itamar Kimchi and Gang Cao
- Abstract summary: We report an exotic quantum state 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.
The control of the COC-enabled CMR and bistable switching offers a fundamentally new paradigm for quantum technologies.
- Score: 6.520855316274887
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Colossal magnetoresistance (CMR) is an extraordinary enhancement of the
electric conductivity in the presence of a magnetic field. It is conventionally
associated with a field-induced spin polarization, which drastically reduces
spin scattering and thus electric resistance. However, ferrimagnetic Mn3Si2Te6
is an intriguing exception to this rule: it exhibits a 7-order-of-magnitude
reduction in ab-plane resistivity with a 13-Tesla anisotropy field which occur
only when a magnetic polarization is avoided [1]. 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. Both the COC state and its CMR are extraordinarily
susceptible to small DC currents exceeding a critical threshold, and a hallmark
of this COC state is an exotic time-dependent, bistable switching mimicking a
first-order melting transition. The control of the COC-enabled CMR and bistable
switching offers a fundamentally new paradigm for quantum technologies.
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