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Entropy-Driven Altermagnetism from Thermal Magnons

Halder, Tanaya et al.
arXiv (All) · Papers
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strongly-correlated-electrons
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
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