Abstract
IN a very interesting communication in NATURE of Dec. 27, 1930, p. 990, K. Honda and Y. Shimizu show that by high pressure the susceptibility of copper is changed* from paramagnetic to diamagnetic. The following is a simple explanation of this fact, without any special theory concerning the susceptibility of metals. We assume that the high pressure, giving a diminution of density of 0.5 per cent, so far destroys the crystal lattice of the copper that parts of the metal become amorphous; then the susceptibility after the deformation may be considered as due to the diamagnetic portion of the normal lattice together with the paramagnetic parts of the amorphous metal, the latter enclosed as a gas in the crystalline copper. It is easy to calculate that, 0.5 per cent of the metal being amorphous, the susceptibility will be changed by the amount given in the communication by Honda and Shimizu. At the temperature of re-crystallisation, the amorphous parts will disappear and the metal will regain its normal susceptibility—just as observed in the experiments quoted.
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References
Change of diamagnetic susceptibility with stress was found first by H. J. Seeman and E. Vogt, Ann. d. Phys., 2, p. 980; 1929.
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GERLACH, W. Effect of Internal Stress on the Magnetic Susceptibility of Metals. Nature 127, 556 (1931). https://doi.org/10.1038/127556a0
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DOI: https://doi.org/10.1038/127556a0
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