Dynamical Scaling in the intermediate temperature phase of Yb₂Ti₂O₇

The magnetic pyrochlore Yb₂Ti₂O₇ is a prototype 3D frustrated magnetic insulator with behaviors that have defied explanation for decades. In this talk I will present ultra-high-resolution neutron scattering from Yb₂Ti₂O₇ just above its ferromagnetic ordering transition T_c=270 mK. We find that spin correlations exhibit dynamical scaling, analogous to behavior found near to a quantum critical point. We show that the observed scaling collapse can be explained within a phenomenological theory of multiple phase competition. However, the scaling equations show T_rod=0, which classically occurs at the degenerate point between three phases, where a classical spin liquid resides. I discuss the possibility that quantum effects renormalize Yb₂Ti₂O₇ closer to this degenerate point. This perspective may hold the key to finally understanding this enigmatic material.