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).
Mendelssohn, K., Proc. Roy. Soc., A, 155, 558 (1936).
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
