Spin-cluster effects in the spin glass Fe sub(2-x)Ti sub(1+x)O sub(5) as observed by transverse-field muon-spin relaxation

Transverse-field muon-spin-relaxation experiments on the anisotropic spin glass Fe sub(2-x)Ti sub(1+x)O sub(5) were performed near and below the spin-glass temperature (x = 0.25; T sub(g) = 43.5 K). Earlier single-crystal work has indicated that spin-cluster effects are present in zero field slightly above the glass temperature. The effect of a transverse-field (B sub( perpendicular )) upon the spin-glass transition and state has been studied by measuring the temperature dependencies of the muon hyperfine parameters at B sub( perpendicular ) = 5 kOe, and the field dependencies at 7, 17, and 49 K. The B sub( perpendicular ) direction has been chosen to be perpendicular to the c axis.