Abstract
The form factor of the diamagnetic moment induced by a field of 4.62 T in a single crystal of graphite has been measured by polarised neutron diffraction. The data are consistent with a pi -electron orbital current having a radius of 1.38(8) AA. A slightly smaller than that of the carbon rings in the planar sheets of the graphite structure (1.42 AA). The corresponding effective mass ratio for the pi -electrons is m*/m=0.019(3).
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