Evolution of magnetic surfboards and spin glass behavior in (Fe 1−p Ga p ) 2 TiO 5

The unusual anisotropy of the spin glass (SG) transition in the pseudobrookite system Fe2TiO5 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 Fe2TiO5 diluted with non-magnetic Ga, (Fe1−pGap)2TiO5, for disorder parameter p = 0, 0.11, and 0.42, and elastic neutron scattering data for p = 0.20. A uniform suppression of Tg is observed upon increasing p, along with a value of χ (Tg) that increases as Tg decreases, i.e. dχ(Tg)/dTg < 0 We also observe C(T) ∝ T 2 in the low temperature limit. The observed behavior places (Fe1−pGap)2TiO5 in the category of a strongly geometrically frustrated SG.