By P. W. Anderson

ISBN-10: 9812388656

ISBN-13: 9789812388650

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E. e. (2) c ~ const — T-Tc The correctness of this law is demonstrated in Fig. 4. The small deviations near the Curie point are found also in ferromagnets, but are not quite the same in detail. Thermally, the electric and magnetic Curie points are not quite so similar in structure. Although both show singularities in the specific heat at this point, the ferroelectric singularity is considerably smaller for the BaTi0 3 class than is the usual ferromagnetic specific heat singularity. Also, while most (not all) known ferromagnetic Curie points are thermodynamically classified as second-order, or A-point, transitions, with no latent heat or discontinuity in volume or other "first order" properties, it is possible that the BaTi0 3 Curie point is a very slightly Tc*2" Fig.

We use S 2 from (IS). The line breadth can then be computed from (12) and Eq. (46) of P a r t I, for all resonant collisions (effects (2) and (3): sum over Jz = Jx—2, / x — 1 , J\, / i + l ) with a contribution computed from Lindholm's figure (7) added in for the alignment forces. Before comparing our results with Lindholm's experiments in Fig. 2, we should like to make some comments about his experimental data. These were taken in the photographic infra-red, by means of densitometer analysis of plates.

175, 430, 1886. (19491 Shirane et. , Phys. Rev. 80, 485. (1950) Smolenskii, J. Tech. Phys. USSR 20, 137. (1950) " P . Weiss, Phys. Zeits. 9, 358 (1908). In commencing the theoretical part of this paper, one can remark that the main task of the theoretician has been to try to de-emphasize the close analogy of ferromagnetism and ferroelectricity, at least as far as the actual basic mechanism is concerned. The ideas involved in the present theoretical picture of the mechanism of ferroelectricity are not new and not complicated.

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A Career In Theoretical Physics by P. W. Anderson

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