IN-FIELD MÖSSBAUER STUDY OF REENTRANT FERROMAGNET Au 19 % Fe 2% Sn. MAGNETIC CLUSTER EFFECTS ? C. Meyer, F. Hartmann-Boutron, J. M. Greneche and F. Varret J. Phys. Colloques, 49 C8 (1988) C8-1155-C8-1156 DOI: 10.1051/jphyscol:19888530