RESOLUTION OF THE A-SITE AND B-SITE HYPERFINE FIELDS OF THE SPINEL SYSTEM MG1+TFE2(1-T)TITO4 IN THE SPIN-GLASS-LIKE STATE

Spectra for three members of the spinel system Mg1+tFe2(1-t)TitO4, with t=0.5, 0.6 and 0.7, all showing re-entrant spin-glass-like behavior, were collected at temperatures down to 1.6 K and decomposed in A- and B-site components, both having a broad distribution of hyperfine fields. The numerical results suggest a more pronounced spin canting on A sites as compared to B sites. From spectra recorded at 4.2 K in an applied field of 6 T, and analysed with a sum of two bi-dimensional distributions of hyperfine fields and canting angles, the existence of reversed A-site spins is evidenced. The number of such spins increases with increasing magnetic dilution. © 1990 J. C. Baltzer A.G. Scientific Publishing Company.