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Guiding antiferromagnetic transitions in Ca $$_{2}$$ 2 RuO $$_{4}$$ 4
oleh: D. G. Porter, F. Forte, V. Granata, M. Cannavacciuolo, R. Fittipaldi, M. Cuoco, A. Bombardi, A. Vecchione
| Format: | Article |
|---|---|
| Diterbitkan: | Nature Portfolio 2022-06-01 |
Deskripsi
Abstract Understanding and controlling the transition between antiferromagnetic states having different symmetry content with respect to time-inversion and space-group operations are fundamental challenges for the design of magnetic phases with topologically nontrivial character. Here, we consider a paradigmatic antiferromagnetic oxide insulator, Ca $$_{2}$$ 2 RuO $$_{4}$$ 4 , with symmetrically distinct magnetic ground states and unveil a novel path to guide the transition between them. The magnetic changeover results from structural and orbital reconstruction at the transition metal site that in turn arise as a consequence of substitutional doping. By means of resonant X-ray diffraction we track the evolution of the structural, magnetic, and orbital degrees of freedom for Mn doped Ca $$_{2}$$ 2 RuO $$_{4}$$ 4 to demonstrate the mechanisms which drive the antiferromagnetic transition. While our analysis focuses on a specific case of substitution, we show that any perturbation that can impact in a similar way on the crystal structure, by reconstructing the induced spin–orbital exchange, is able to drive the antiferromagnetic reorganization.