Journal of Chemical Physics 2012-09-21

High resolution 11B NMR of magnesium diboride using cryogenic magic angle spinning.

Peter Beckett, Mark S Denning, Ivo Heinmaa, Mukesh C Dimri, Edward A Young, Raivo Stern, Marina Carravetta

Index: J. Chem. Phys. 137(11) , 114201, (2012)

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Abstract

Static and magic-angle spinning (11)B nuclear magnetic resonance (NMR) data at 4.7 T and 8.5 T have been obtained under cryogenic conditions on a diluted sample of magnesium diboride powder in the normal and superconducting state. The data provide accurate information on the magnetic shift and longitudinal relaxation time down to a temperature of 8 K, with a resolution improvement over the entire temperature range. The onset of superconductivity is unaffected by the sample rotation, as revealed by a steep variation of the magnetic shift just below the critical temperature.