Hedgehog Spin-Vortex Crystal Antiferromagnetic Quantum Criticality in CaK(Fe_1−xNi_x)_4As_4 Revealed by NMR - Q.-P. Ding, W. R. Meier, J. Cui, M. Xu, A. E. Böhmer, S. L. Bud’ko, P. C. Canfield,; Y. Furukawa (American Physical Society (APS), 2018)
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