Michael Foerster, Milko Iliev, Nico Dix, Xavier Martí, Mykhailo Barchuk, Florencio Sánchez and Josep Fontcuberta The Poisson Ratio in CoFe2O4 Spinel Thin Films Advanced Functional Materials 22
The response of CoFe2O4 thin films to epitaxial compressive stress is studied. It is found that the unit cell expands in the perpendicular direction, signaling a non-auxetic behavior, but not enough to conserve the unit cell volume. The Poisson ratio is in agreement with expectations based on general arguments of atomic packing density but smaller than theoretical predictions.
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