Ferroelectric ordering in the endofullerene H2O@C60 and the effects of applied electric field
This proposal concerns the translation-rotation quantum dynamics of water molecules encapsulated inside a C60 cage in the endofullerene H2O@C60 and the influence of the electric dipole moments on intra- and inter-cage interactions. For classical dipoles a transition to ferro- (or antiferro-) electric ordering is expected at temperatures below the interaction energy ~3K. In H2O@C60 the transition temperature will be lower as quantum rotational delocalization lowers the interaction energy. Studying the INS spectrum (in NE gain and loss) of a 100% filled sample at low temperature using the mK fridge, we shall investigate shifts in the energy of the ortho-H2O states that will accompany the ferroelectric ordering. We propose further investigating intra- and inter-cage interactions by studying changes that arise in the NE gain spectrum when an electric field is applied to partially align the electric dipoles.
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HORSEWILL Anthony J.; AOUANE Mohamed; JOHNSON Mark Robert; LEVITT Malcolm; MAMONE Salvatore; OLLIVIER Jacques; ROLS Stephane and Richard J. Whitby. (2015). Ferroelectric ordering in the endofullerene H2O@C60 and the effects of applied electric field. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-05-449
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