Uncovering the signature of dipolar interactions from critical scattering in Ni
The dynamical scaling behavior of dipolar ferromagnets close to T_C is well understood in terms of mode coupling and renormalization group theory calculations based on a Heisenberg model. In addition to the exchange coupling, localized spins interact via long range dipolar interaction, which drastically changes the linewidth of the critical fluctuations in the long wavelength regime. This has been verified in archetypical systems such as Fe, EuO and EuS, but conversely no clear cut evidence has been found in Ni. That fact is conceivable due to the small dipolar wavevector q_D = 0.013 1/A, a measure of the strength of the dipolar interaction, which defines an upper bound in momentum space. For q < q_D the dynamic behavior of Ni is expected to show the signature of dipolar interactions. We aim to elucidate the existence of this dipolar coupling by measuring the dynamical scaling function just above T_C = 631 K. To accurately extract the linewidth of critical fluctuations at such small q, exceptional energy resolution, on the order of 1 mueV, is required. That is why we apply for beam time at IN15, which is uniquely capable to conduct this experiment.
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The recommended format for citing this dataset in a research publication is in the following format:
BEDDRICH Lukas; BOENI Peter; HOFFMANN Ingo and Johanna K. Jochum. (2023). Uncovering the signature of dipolar interactions from critical scattering in Ni. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-03-1767
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