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The ytterbium pyrochlore magnets, Yb2B2O7 (B = Sn, Ti, Ge) are well describedby S_eff = 1/2 quantum spins decorating a network of corner-sharing tetrahedraand interacting via anisotropic exchange. Structurally, only the non-magneticB-site cation, and hence, primarily the lattice parameter, is changing acrossthe series. Nonetheless, a range of magnetic behaviors are observed: the lowtemperature magnetism in Yb2Ti2O7 and Yb2Sn2O7 has ferromagnetic character,while Yb2Ge2O7 displays an antiferromagnetically ordered Neel state at lowtemperatures. While the static properties of the ytterbium pyrochlores aredistinct, inelastic neutron scattering measurements reveal a common characterto their exotic spin dynamics. All three ytterbium pyrochlores show a gaplesscontinuum of spin excitations, resembling over-damped ferromagnetic spin wavesat low Q. Furthermore, the specific heat of the series also follows a commonform, with a broad, high-temperature anomaly followed by a sharplow-temperature anomaly at T_C or T_N. The novel spin dynamics we reportcorrelate strongly with the broad specific heat anomaly only, remainingunchanged across the sharp anomaly. This result suggests that the primary orderparameter in the ytterbium pyrochlores associated with the sharp anomaly is"hidden" and not simple magnetic dipole order.

Universal Dynamic Magnetism in Yb-Pyrochlores with Disparate Ground States