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Researchers show that DFT-relaxed structural distortions cause machine-learning screens to misclassify hidden altermagnets as antiferromagnets, and propose a tolerance-aware symmetry pipeline that discovers six new altermagnet materials including Ba₂FeMoO₆ and Sr₂FeWO₆, with spin splitting of 85–405 meV at zero net magnetization.
CARAT introduces a matched-evidence benchmark to test whether materials LLMs truly reason over crystal structures or merely recite answers printed in their inputs, finding large apparent gains that largely measure baseline gaps rather than reasoning ability.