Overhauser effects in non-conducting solids at 1.2 K
Author(s)Ji, X.; Can, T. V.; Mentink-Vigier, Frédéric; Bornet, A.; Milani, J.; Vuichoud, B.; Caporini, M. A.; Griffin, R.G.; Goldman, M.; Bodenhausen, G.; ... Show more Show less
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Recently, it was observed that protons in non-conducting solids doped with 1,3-bisdiphenylene-2-phenylallyl (BDPA) or its sulfonated derivative (SA-BDPA) can be polarized through Overhauser effects via resonant microwave irradiation. These effects were present under magic angle spinning conditions in magnetic fields between 5 and 18.8 T and at temperatures near 100 K. This communication reports similar effects in static samples at 6.7 T and, more importantly, at temperatures as low as 1.2 K, in a different dynamic regime than in the previous study. Our results provide new information towards understanding the mechanism of the Overhauser effect in non-conducting solids. We discuss possible origins of the fluctuations that can give rise to an Overhauser effect at such low temperatures.
DepartmentMassachusetts Institute of Technology. Department of Chemistry; Francis Bitter Magnet Laboratory (Massachusetts Institute of Technology)
Journal of Magnetic Resonance
Ji, X., et al., "Overhauser effects in non-conducting solids at 1.2 K." Journal of Magnetic Resonance 286 (Jan. 2018): p. 138-42 doi 10.1016/J.JMR.2017.11.017 ©2018 Author(s)
Author's final manuscript