Abstract
WE have investigated the magnetic behaviour of lanthanum below 10° K. The metal was kindly lent to us by Prof. F. M. Jaeger of Groningen; the analysis was given as lanthanum 98 per cent, iron 1 per cent and traces of carbon, silicon, aluminium and magnesium. Two lumps of irregular shape were tested by methods described previously1,2. Strong diamagnetic susceptibility, which could be destroyed by a magnetic field, showed that the specimens became supracoiiductive. After supraconductivity had been destroyed by a magnetic field, the magnetic flux threading the specimens froze in when the field was lowered again. The formation of such a supra-conductive sponge was to be expected in a specimen containing 2 per cent of impurities3.
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References
Mendelssohn, k., and Moore, J. R., Phil. Mag., (21), 7, 532 (1936).
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Keeley, T. C., Mendelssohn, K., Proc. Roy. Soc., A, 154, 378 (1936).
Mendelssohn, K., and Babbitt, J. D., Proc. Roy. Soc., A, 151, 316 (1935).
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MENDELSSOHN, K., DAUNT, J. Supraconductivity of Lanthanum. Nature 139, 473–474 (1937). https://doi.org/10.1038/139473c0
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DOI: https://doi.org/10.1038/139473c0
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