Physics
Scientific paper
Mar 1939
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1939natur.143..434s&link_type=abstract
Nature, Volume 143, Issue 3619, pp. 434-435 (1939).
Physics
6
Scientific paper
THE magnetic properties of some colloidal mercury preparations have been investigated by a ballistic method, and provide direct evidence for the existence of a small penetration depth of a magnetic field into a superconductor, and for a temperature dependence of this penetration of the same kind as observed by Appleyard, Bristow and London1. From the initial slope of the magnetization curve, the magnetic moment per unit field per unit volume of mercury (χ) can be deduced for the small spherical particles of the colloid, and this was found to be appreciably smaller numerically than the value χ0 = -⅜π for a largo sphere (in which the penetration of the magnetic field is relatively negligible), and to decrease with increasing temperature towards the transition temperature (4.17°K.). This is illustrated in Fig. 1, which shows the temperature variation of χ/χ0 for a colloid of mercury in gelatine (average particle diameter of order 10-4 cm.). From the magnetization curves, the critical field h was also obtained, as the field at which the magnetization disappeared, and as in the case of thin wires2 and thin films3, h was larger than the bulk critical field Hc; the temperature dependence of h/Hc is shown in Fig. 1.
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