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Updated: Sep 12, 2025
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Altermagnetic Phase Transition in a Lieb Metal.
Matteo Dürrnagel1, Hendrik Hohmann1, Atanu Maity1
1Universität Würzburg, Institut für Theoretische Physik und Astrophysik and Würzburg-Dresden Cluster of Excellence ct.qmat, 97074 Würzburg, Germany.
Physical Review Letters
|August 4, 2025
Summary
Researchers explored the transition from a metallic state to altermagnetic order. The study found sublattice interference, not orbital ordering, drives this magnetic phase transition in a Lieb lattice model.
Area of Science:
- Condensed matter physics
- Materials science
- Quantum magnetism
Background:
- Altermagnetism is a novel magnetic state distinct from ferromagnetism and antiferromagnetism.
- Understanding the mechanisms driving magnetic phase transitions is crucial for developing new magnetic materials.
Purpose of the Study:
- To investigate the microscopic mechanism behind the phase transition to itinerant altermagnetic order.
- To analyze the role of sublattice interference versus orbital ordering in this transition.
Main Methods:
- Development of a microscopic model.
- Analysis of electron behavior on a Lieb lattice.
Main Results:
- The phase transition is driven by sublattice interference.
- Orbital ordering is not the underlying mechanism for this altermagnetic state.
Conclusions:
- Sublattice interference is identified as the key mechanism for the emergence of altermagnetic order in the studied system.
- This finding offers new insights into the fundamental physics of magnetism and magnetic phase transitions.
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