Evolution of magnetic surfboards and spin glass behavior in (Fe_1−p Ga _p )₂TiO₅

Abstract The unusual anisotropy of the spin glass (SG) transition in the pseudobrookite system Fe 2 TiO 5 has been interpreted as arising from an induced, van der Waals-like, interaction among magnetic clusters. Here we present susceptibility ( χ ) and specific heat data ( C ) for Fe 2 TiO 5 diluted with non-magnetic Ga, (Fe 1− p Ga p ) 2 TiO 5 , for disorder parameter p = 0, 0.11, and 0.42, and elastic neutron scattering data for p = 0.20. A uniform suppression of T g is observed upon increasing p , along with a value of χ T g that increases as T g decreases, i.e. d χ ( T g ) / d T g < 0 We also observe C T ∝ T 2 in the low temperature limit. The observed behavior places (Fe 1− p Ga p ) 2 TiO 5 in the category of a strongly geometrically frustrated SG.