The near-zero thermal expansion of Invar alloy Fe65Ni35 is technologically important but still unexplained. Measurements show that this phenomenon can be explained by the cancellation of magnetic and phonon contributions to the alloy’s entropy.
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Röhlsberger, R. A delicate balance of phonons and spins. Nat. Phys. 19, 1547–1548 (2023). https://doi.org/10.1038/s41567-023-02152-x
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DOI: https://doi.org/10.1038/s41567-023-02152-x
