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Ising-like spin-1/2 magnetic materials are of interest for their readyconnection to theory, particularly in the context of quantum critical behavior.In this work we report detailed studies of the magnetic properties of a memberof the rare earth pyrosilicate family, D-Er$_{2}$Si$_{2}$O$_{7}$, which isknown to display a highly anisotropic Ising-like g-tensor and effectivespin-1/2 magnetic moments. We used powder neutron diffraction, powder inelasticneutron spectroscopy (INS), and single crystal AC susceptibility tocharacterize its magnetic properties. Neutron diffraction enabled us todetermine the magnetic structure below the known transition temperature($T_{N}$ = 1.9 K) in zero field, confirming that the magnetic state is afour-sublattice antiferromagnetic structure with two non-collinear Ising axes,as was previously hypothesized. Our powder INS data revealed a gappedexcitation at zero field, consistent with anisotropic (possibly Ising)exchange. An applied field of 1 T produces a mode softening, which isconsistent with a field-induced second order phase transition. To assess therelevance of D-Er$_{2}$Si$_{2}$O$_{7}$ to the transverse field Ising model, weperformed AC susceptibility measurements on a single crystal with the magneticfield oriented in the direction transverse to the Ising axes. This revealed atransition at 2.65 T at 0.1 K, a field significantly higher than themode-softening field observed by powder INS, showing that the field-inducedphase transitions are highly field-direction dependent as expected. Thesemeasurements suggest that D-Er$_{2}$Si$_{2}$O$_{7}$ may be a candidate forfurther exploration related to the transverse field Ising model.

Magnetic Properties of the Ising-like Rare Earth Pyrosilicate: D-Er$_{2}$Si$_{2}$O$_{7}$