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ZF and low-LF μSR in spin-glassy icosahedral Al-Mn-Si quasicrystal

  • Session 2. Magnetism
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Abstract

ZF-μSR measurements in icosahedral Al73Mn21Si6, which has a spin glass freezing temperature of 6.4K, show that the spin-freezing process in this quasicrystal is very similar to that observed in crystalline dilute Cu(Mn), but that the temperature range of partial freezing (coexisting frozen and unfrozen regions) is much wider in the quasicrystal. Low-LF spectra confirm that a substantial volume remains unfrozen down to T g /2 at least. Whether this is more consistent with macroscopic inhomogeneous freezing or any more homogeneous model, such as fractal clusters, depends on resolving and understanding the T≪T g static limit.

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DRN supported by USDOE grant DE-FG05-88ER45353, PM supported at TRIUMF by NSERC Canada.

Thanks to Y. Calvayrac of CECM-CNRS Vitry (France) for providing the sample, and to T.L. Duty, S. Johnston, and G.D. Morris for assistance in collecting these data. This work was also partially supported by the NRC of Canada, through its support of TRIUMF.

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Noakes, D.R., Mendels, P. ZF and low-LF μSR in spin-glassy icosahedral Al-Mn-Si quasicrystal. Hyperfine Interact 85, 299–304 (1994). https://doi.org/10.1007/BF02069438

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