Abstract
EXPERIMENTS by Pickard1, which will shortly be published, have shown that the specific heat of liquid helium becomes roughly proportional to T3 at about 0.9°–0.8°, that is, that the anomalous part of it has died out. This fact suggests that the other properties depending on the transition of atoms or groups of atoms into a state of higher energy—which is responsible for the λ–phenomenon—will also disappear in this region. The most conspicuous property of this type is the anomalous heat conduction which has lately been investigated by various authors2. The presumption that this anomalous conduction would vanish at very low temperatures was supported by a casual observation: we found that if a capsule3of the type used in magnetic cooling experiments contains insufficient helium to cover the salt completely, temperature differences within the capsule equalize only very slowly. One might have expected, remembering the well-known characteristics of liquid helium II found by Rollin4, that a film of helium would cover the salt and bring about rapid equalization of temperature.
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Pickard, G. L., Dissertation, Oxford (1937).
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Rollin, B. V., (a) Dissertation, Oxford (1935); (b) Proc. VII. Int Cong. Refrig., The Hague, 1, 187 (1936); (c) Ref. 3. See also: Daunt, J., and Mendelssohn, K., NATURE, 141, 911 (1938); and Kikoin, A. K., and Lasareff, B. G., NATURE, 141, 912 (1938)
Shire, E. S., and Allen, J. F., Proc. Camb. Phil. Soc., 34, 307 (1938).
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Debye, P., "Vorträge über die kinetische Theorie der Materie undi Elektrizität" (Teubner, 1914), 50.
Burton, E. F., NATURE, 141, 970 (1938).
Casimir, H. B. G., Physica, 5, 495 (1938).
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KÜRTI, N., SIMON, F. Heat Transport in Liquid Helium below I°. Nature 142, 207 (1938). https://doi.org/10.1038/142207a0
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DOI: https://doi.org/10.1038/142207a0
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