Letter | Published:

Thermal Conductivity at Low Temperatures

Nature volume 141, page 1053 (11 June 1938) | Download Citation



IN continuation of our experiments on quartz and potassium chloride1, Mr. Biermasz and I have determined the conduction of heat in quartz crystals of varying dimensions. (A complete account of this work will appear in Physica.) The object of the investigation was to study the dependence of the conductivity on the dimensions of the crystal2. It was found that both in the case of potassium chloride and silica (at temperatures 2·5°, 2·9° and 3·3° K.) the heat resistance is a definite function of the radius R; when R tends to zero the resistance becomes infinite more quickly than 1/R2, or in other words, the 'specific' resistance becomes infinite. With increasing thickness, on the other hand, the specific resistance approaches a constant value asymptotically; for potassium chloride this value is almost reached for 2R 1 cm. ; for silica this will be the case for 2R 3 cm.

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  1. 1.

    Physica, 5, No. 4, 320 (1938).

  2. 2.

    , Ann. Phys., (3), 5, 1055 (1929).

  3. 3.

    "Vorträge über die Kin.Theorie der Materie", by , 19 (1914).

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  1. Kamerlingh Onnes Laboratory, Leyden. May 9.

    • W. J. DE HAAS


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