INFLUENCE OF A MAGNETIC FIELD ON NEUTRON SCATTERING BY FERROMAGNETS NEAR THE CRITICAL POINT (in French)
The static spin correlations in a ferromagnet are derived from simple thermodynamical assumptions, similar to those made by Landau and Lifshitz in the theory of Weiss domains. These quantities are related to the intensity of magnetically scattered neutrons near the Curie point, if the momentum transfer is small enough. The cross section for unpolarized neutrons is given in terms of the correlations. It is found that, for a given magnetic field and temperature, the Van Hove formula is verified for weak dependences upon field and temperature. The variation with field is studied, making simple assumptions on the magnetization curve. The results are compared with the experimental data for iron. To give a realistic idea of the variation of the parameters, they are calculated using the constant coupling approximation. (auth)
- Research Organization:
- CEN, Saclay, France
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-18-004520
- OSTI ID:
- 4123920
- Journal Information:
- J. Phys., Journal Name: J. Phys. Vol. Vol: 24
- Country of Publication:
- Country unknown/Code not available
- Language:
- French
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