The structure and physical properties of Ln30Ru4+xSn31-y (Ln = Gd and Tb) have recently been reported, and anomalies in the low-temperature magnetization data were observed.  In order to elucidate the origins of this behavior, heat capacity and additional magnetization measurements were performed on Ln30Ru4+xSn31-y (Ln = Gd�Dy).  All analogues exhibit complex magnetic behavior, with magnetic transitions evident in both temperature-dependent magnetic and heat capacity data.  The Tb and Dy-analogues display average triplet and doublet ground states, respectively, likely caused by a high degree of crystal electric field (CEF) effects from the low symmetry rare earth sites.  The Gd-analogue, as a spin-only system, does not display CEF effects, but exhibits superparamagnetic-like behavior which is linked to short Gd�Gd dimers.  Additionally, Gd30Ru4+xSn31-y shows a first order phase transition ~15 K.

Magnetism in highly complex intermetallics: Heat capacity and magnetism of Ln30Ru4+xSn31-y (Ln = Gd–Dy)

245th National Meeting (2013)

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