Abstract
Both methods, Perturbed Angular Correlation (PAC) utilizing radioactive probes and Perturbed Angular Distribution (PAD) following nuclear reactions measure hyperfine interaction parameters and allow to study magnetism on a rather local scale. While both techniques are based on the same theory the underlying concepts are quite different. Examples on local moments, influence of the nearest-neighbor to the magnetic field in ferromagnets, Knight shifts in nonmagnetic materials, and magnetism in high-temperature superconductors and related oxides illustrate the recent developments within the methods and the improvements in their sensitivity and resolution.
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Mahnke, H.E. Introduction to PAC/PAD. Hyperfine Interact 49, 77–102 (1989). https://doi.org/10.1007/BF02405137
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DOI: https://doi.org/10.1007/BF02405137