Fractal Magnetic Domains in NdNiO<sub>3</sub>
ORAL
Abstract
Nanoscale probes often reveal complex, multiscale electronic structures at the surface of correlated quantum materials. Our resonant magnetic X-ray scattering nanoprobe measurements revealed a scale-free distribution of antiferromagnetic domains with fractal magnetic geometry [Li et al., Nat. Commun., 2019]. We use 4-state clock models to predict the expected shapes and statistics of these domains near the critical point. Using cluster techniques, we compare the critical exponents from these models to the fractal magnetic textures observed with X-ray scattering in order to identify the critical point controlling the complex pattern formation. We find that the critical exponents from the 2D Random Field 4-Clock Model are consistent with the critical exponents measured in NdNiO3.
*F.S. and E.W.C. acknowledge support from NSF Grant Nos. DMR-1508236 and DMR-2006192 and the Research Corporation for Science Advancement Cottrell SEED Award.
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Publication: Li, J., Pelliciari, J., Mazzoli, C. et al. Scale-invariant magnetic textures in the strongly correlated oxide NdNiO3. Nat Commun 10, 4568 (2019). https://doi.org/10.1038/s41467-019-12502-0
Presenters
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Forrest Simmons
- Purdue University