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(a) The quadrupole shift of coated (open circles) and uncoated (solid circles) 8 nm hematite particles as a function of temperature. (b) The quadrupole shift of uncoated hematite nanoparticles at 20 K as a function of particle size. Reprinted from Frandsen, C.; Mørup, S. Spin rotation in α-Fe2O3 nanoparticles by interparticle interactions, Phys. Rev. Lett. 2005, 94, 027202. Copyright (2005) by the American Physical Society.
