paper

The Geometrically Frustrated Spin Glass (Fe1-pGap)2TiO5

arXiv:2207.06354

Abstract

The unusual anisotropy of the spin glass 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 ( $I ¨ $ ) and specific heat data (C) for Fe2TiO5 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 $I ¨ (T_{g})$ that increases as T $_{g}$ decreases, i.e. $d I ¨ (T_{g}) / d T_{g} < 0$ . We also observe C(T) $\propto$ 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 spin glass.

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