IN a previous communication1 it was shown that the observed large diamagnetism of graphite along its hexagonal axis is that of its 'free' electrons, and is of the Landau type. At high temperatures it conforms to the Curie law K = -nµ2/(3 kT), and at low temperatures it tends to the temperature-independent value K = -nµ2/(2 kT0), where n, the number of free electrons, is found to be just one per carbon atom, and T0, the degeneracy temperature, is found to be about 520° K.; µ is the Bohr magneton.
NATURE, 145, 31 (1940); see also presidential address to the Physics Section, Ind. Sci. Congress, Madras Session, 1940.
Nernst, W., Ann. Phys., 36, 395 (1911); Magnus, A., Ann. Phys., 303, 70 (1923).