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Normal Fluid Concentration in Liquid Helium II below 1°K

Normal Fluid Concentration in Liquid Helium II below 1°K The left side refers to the three orthogonal susceptibilities of the solid polycrystalline sample, the right to the single crystal sus- ceptibility. An apparatus of the Faraday type which satisfies the condition of uniformity for H and grad I H I over a suitable volume has been designed' and applied to the measurement of polycrystalline graphite. A Honda-Owen correction has been employed to de- termine the effect of ferromagnetic impurities, using field strengths from 8000 to 16 000 oersteds. The total susceptibility 2xm has been measured for various grades running from various petroleum base Atcheson graphites to natural and lampblack graphites. Al- though the accuracy of the measurements is of the order of 1 per- cent, the precision and relative values are correct to better than 0.5 percent. Small cubical samples 8 inch on edge were employed. For a given type of graphite the invariance of the total suscep- tibility was verified to 0.5 percent, and all the Atcheson graphites examined fell in the range -20.5 X 10-6 to -21.2 X 10-6 cgs. For comparison, Guha and Roy2 find for the spur of a single crystal the value -23.5X 10-6 cgs. The "anisotropy ratio" for the manu- factured http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review American Physical Society (APS)

Normal Fluid Concentration in Liquid Helium II below 1°K

de Klerk, D; Hudson, R. P; Pellam, J. R
Physical Review , Volume 89 (3) – Feb 1, 1953
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Publisher
American Physical Society (APS)
Copyright
Copyright © 1953 The American Physical Society
ISSN
1536-6065
DOI
10.1103/PhysRev.89.662.2
Publisher site
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Abstract

The left side refers to the three orthogonal susceptibilities of the solid polycrystalline sample, the right to the single crystal sus- ceptibility. An apparatus of the Faraday type which satisfies the condition of uniformity for H and grad I H I over a suitable volume has been designed' and applied to the measurement of polycrystalline graphite. A Honda-Owen correction has been employed to de- termine the effect of ferromagnetic impurities, using field strengths from 8000 to 16 000 oersteds. The total susceptibility 2xm has been measured for various grades running from various petroleum base Atcheson graphites to natural and lampblack graphites. Al- though the accuracy of the measurements is of the order of 1 per- cent, the precision and relative values are correct to better than 0.5 percent. Small cubical samples 8 inch on edge were employed. For a given type of graphite the invariance of the total suscep- tibility was verified to 0.5 percent, and all the Atcheson graphites examined fell in the range -20.5 X 10-6 to -21.2 X 10-6 cgs. For comparison, Guha and Roy2 find for the spur of a single crystal the value -23.5X 10-6 cgs. The "anisotropy ratio" for the manu- factured

Journal

Physical Review – American Physical Society (APS)

Published: Feb 1, 1953

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