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Large Spontaneous Nonreciprocal Charge Transport in a Zero-Magnetization Antiferromagnet.
Kenta Sudo1, Yuki Yanagi2, Mitsuru Akaki1
1Institute for Materials Research, Tohoku University, Sendai, Miyagi 980-8577, Japan.
Physical Review Letters
|January 26, 2026
Summary
Researchers observed spontaneous nonreciprocal charge transport in NdRu2Al10, a metal exhibiting antiferromagnetic order. This finding, driven by strong magnetic fields from c-f interactions, offers new insights into symmetry-broken metals.
Area of Science:
- Condensed Matter Physics
- Solid-State Chemistry
- Materials Science
Background:
- Symmetry breaking (time-reversal and spatial-inversion) in solids leads to unique phenomena.
- Research on these phenomena is extensive in insulators but limited in metals.
Purpose of the Study:
- To investigate spontaneous nonreciprocal charge transport in metals.
- To explore the properties and underlying mechanisms of this transport in NdRu2Al10.
Main Methods:
- Experimental observation of nonreciprocal charge transport.
- Analysis of antiferromagnetic order and its relation to magnetic toroidal dipole order.
- Investigation of c-f exchange interactions and effective magnetic fields.
Main Results:
- Observation of spontaneous (zero-field) nonreciprocal charge transport in NdRu2Al10.
- An exceptionally large nonreciprocal coefficient was measured.
- The response is linked to antiferromagnetic spin configurations and strong effective magnetic fields from c-f interactions.
Conclusions:
- NdRu2Al10 exhibits significant spontaneous nonreciprocal charge transport due to its antiferromagnetic order.
- This behavior is distinct from field-induced effects and provides a new avenue for studying symmetry-broken metals.
- Findings contribute to understanding cross-correlations in magnetic materials.
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