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arXiv · 2609.40002

Entropy-Driven Altermagnetism from Thermal Magnons

Tanaya Halder·Ashis K. Nandy·Anamitra Mukherjee
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Abstract

We identify a route to altermagnetism driven by entropy upon heating and demonstrate it in a minimal square-lattice antiferromagnet. An exchange modulation is entropically favored because the resulting momentum-dependent magnon splitting increases the magnon entropy, thereby lowering the free energy and favoring altermagnetism. We derive an instability criterion for this exchange-modulated state, predict its temperature-driven reentrant behavior, and show that its overlap with Néel order defines a finite-temperature altermagnetic phase. Variational spin-wave theory, spin--lattice Monte Carlo, and cluster diagonalization establish the entropy-driven instability and its coexistence with magnetic order. The resulting state supports a transverse spin conductivity. The mechanism provides a route to thermally induced altermagnetism in compensated magnets coupled to sufficiently soft physical modes.

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Tanaya Halder, Ashis K. Nandy, Anamitra Mukherjee. 2026-09-30. Entropy-Driven Altermagnetism from Thermal Magnons. https://arxiv.org/abs/2609.40002

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