The perovskite SeCuO₃ is unusual for possessing (i) a very small A-site (Se⁴⁺) radius, (ii) highly distorted Cu-O-Cu bond angles (α), and (iii) a ferromagnetic (FM) ground state. Negative chemical pressure is applied by replacing Se with Te in solid solution, causing a continuous transformation between the FM state and an antiferromagnetic (AFM) state. This is the first FM-AFM transformation to be controlled by a single microscopic parameter, the in-plane α, allowing a precise determination of the crossover angle (αc0ex0ex=0ex0ex127^∘±0.5^∘) between FM and AFM superexchange.
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Subramanian et al. (1999) studied this question.
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