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Nonlinear Transverse Conductivity in Antiferroic Types of Magnetic Toroidal Metal.
T Miyamoto1, M Shimozawa1, S Hosoi1
1the University of Osaka, Graduate school of Engineering Science, Toyonaka 560-8531, Japan.
Physical Review Letters
|September 10, 2025
Summary
Nonlinear transverse conductivity (NLTC) measurements reveal new insights into magnetic toroidal (MT) structures in HoAgGe. The study redefines MT phases, establishing NLTC as a key tool for understanding MT metals and antiferroic interactions.
Area of Science:
- Condensed Matter Physics
- Magnetism
- Materials Science
Background:
- HoAgGe exhibits complex magnetic toroidal (MT) structures.
- Previous studies assigned MT phases inconsistently, leading to discrepancies in understanding its properties.
Purpose of the Study:
- To accurately characterize the magnetic toroidal structures in HoAgGe.
- To investigate the relationship between MT structures and nonlinear transverse conductivity (NLTC).
- To re-evaluate and correct previous assignments of MT phases.
Main Methods:
- Precise measurements of nonlinear transverse conductivity (NLTC) at zero magnetic field.
- Analysis utilizing multipole theory to interpret magnetic structures.
- Temperature-dependent conductivity measurements.
Main Results:
- NLTC signal observed below 7 K (MT1 phase) and increases with decreasing temperature.
- NLTC signal remains near zero between 7 K and 11.6 K (MT2 phase).
- Reassignment of MT1 phase to ferro-MT and MT2 phase to antiferro-MT structures based on multipole theory.
Conclusions:
- The observed NLTC behavior in HoAgGe is explained by redefining MT1 as ferro-MT and MT2 as antiferro-MT structures.
- NLTC is established as a reliable method for identifying magnetic toroidal metals.
- The findings open avenues for exploring phenomena related to antiferroic interactions of MT dipoles.
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