Abstract
CONTINUING our experiments1 with the magnetic method, we investigated the suitability of a number of substances. The efficiency of a substance for this purpose can be defined by a characteristic temperature m, which may be calculated by means of a formula which we derived under certain simplifying assumptions about the splitting of the ground state of the magnetic ions. According to this formula, the final temperature reached in demagnetising to the field zero is inversely proportional to the initial magnetic field, proportional to the initial temperature and to the temperature m, characteristic for each substance, defined by m = U/k (U = energy difference between the adjacent levels of the ground state, k = Boltzmann's constant). Thus, the smaller m, the more suitable is the substance for attaining low temperatures.
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N. Kürti and F. Simon, NATURE, 133, 907; 1934. Physica, 1, 1107; 1934. A detailed report will appear shortly.
Our results with this substance agree satisfactorily with those of Giauque and MacDougall, Phys. Rev., 44, 235; 1933.
W. J. Haas and E. C. Wiersma, Physica, 1, 779; 1934.
See Debye, Sitzungsber., Math. Phys. Kl. Sachs. Akad. Wiss., 83, 105; 1934.
See, for example, F. Simon, Z. Phys., 81, 826; 1933.
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KÜRTI, N., SIMON, F. Further Experiments with the Magnetic Cooling Method. Nature 135, 31 (1935). https://doi.org/10.1038/135031a0
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DOI: https://doi.org/10.1038/135031a0
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