Structural Tuning of Ferromagnetism in a 3D Cuprate Perovskite
M. A. Subramanian, A. P. Ramirez, W. J. Marshall
DOI 10.1103/PhysRevLett.82.1558 · Physical Review Letters
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Abstract
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 (αc=127°±0.5°) between FM and AFM superexchange.
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