Physics – Condensed Matter – Materials Science
Scientific paper
2009-07-05
J. Low Temp. Phys. 158, 672 (2010).
Physics
Condensed Matter
Materials Science
6 pages, 5 figures
Scientific paper
We described details of a method to estimate with good accuracy the mosaic angle distributions of microcrystallites (platelets) in exfoliated graphite like Grafoil which is commonly used as an adsorption substrate for helium thin films. The method is based on analysis of resonance field shifts in continuous-wave (CW) NMR spectra of $^{3}$He ferromagnetic monolayers making use of the large nuclear polarization of the adsorbate itself. The mosaic angle distribution of a Grafoil substrate analyzed in this way can be well fitted to a gaussian form with a $27.5\pm2.5$ deg spread. This distribution is quite different from the previous estimation based on neutron scattering data which showed an unrealistically large isotropic powder-like component.
Fukuyama Hiroshi
Takayoshi Shintaro
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