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Abstract De Haas-van Alphen oscillations of magnetization have been studied in single crystals of sodium by means of a sensitive recording system based on the modulation technique of Shoenberg 110 directions, towards the faces of the first Brillouin zone, as would be expected for nearly free electrons. The extreme radial distortion of the Fermi surface from a free electron sphere is found to be rather less than 1 part in 103.
M. J. G. Lee (Tue,) studied this question.