Diffusion critique des neutrons par le fer

• Published in: Physics letters. A Vol. 31; no. 10; pp. 561 - 563
• Main Authors: Bourdonnay, H., Bousquet, A., Cotton, J.P., Cribier, D., Farnoux, B., Feuillatre, R., Hennion, B., Jacquier, J., Jannink, G., Kahn, R., Mons, D., Mons, J., Parette, G., Pepy, G., Rouleau, L., Trotin, J.P., Moussa, Mme, Tournarie, M.
• Format: Journal Article
• Language: French
• Published: Elsevier B.V 18.05.1970
• ISSN: 0375-9601; 1873-2429
• DOI: 10.1016/0375-9601(70)90353-1

The behaviour of the Van Hove function S( q, ω) in the neighborhood of the Curie point ( T c ⩽ T⩽1.04 T c ) has been studied in iron by inelastic neutron scattering at scattering vector q in the range 1.8 × 10 -2 < | q| < 7.1 × 10 -2 A ̊ -1 . The critical exponent z of the diffusion constant Λ o {( T− T c )/ T c } z has been found equal to 0.36 ± 0.06 in a region of space ( q, T) where the relaxation seems to be hydrodynamic in character.