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Shape Dependence of the Specific Heat of Magnetic Systems with Long‐Range Interactions
1.A preliminary report is given by P. M. Levy, Bull. Am. Phys. Soc. 12, 311 (1967). The theory of the shape dependence of the free energy will be published elsewhere.
2.G. Horwitz and H. B. Callen, Phys. Rev. 124, 1757 (1961).
3.R. B. Stinchcombe, G. Horwitz, F. Englert, and R. Brout, Phys. Rev. 130, 155 (1963).
4.Instead of using the free energy defined by we define a new free energy where
5.M. Ball, M. J. M. Leask, W. P. Wolf, and A. F. G. Wyatt, J. Appl. Phys., 34, 1104 (1963).
6.B. E. Keen, D. Landau, B. Schneider, and W. P. Wolf, J. Appl. Phys. 37, 1120 (1966). Additional measurements of the isothermal magnetization of DAG near the critical field curve have been made by C. A. Catanese and D. P. Laudau (unpublished). An extensive account of the magnetothermal properties of DAG is being published by these authors and we wish to thank them for allowing us to use their results prior to publication.
7.As it was not possible to reshape the original ellipsoid, we were forced to shape a specimen from another single crystal. This specimen had a Néel temperature which was almost 25 mdeg lower than the first ellipsoid and the maximum in specific heat was about 15% less. To correct for the difference in we have related all results on the second sample to those on the first sample by scaling the temperature by the ratio of the Néel temperatures. The specific heats measured in a finite field have been reduced to the shape independent the results are slightly lower for the second sample than for the first one (see Fig. 1). This difference could be expected because the zero‐field measurements indicated there were stoichiometric differences between the samples.
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