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Ferroquadrupole order associated with local $4f$ atomic orbitals of rareearth ions is a realization of electronic nematic order. However, there arerelatively few examples of intermetallic materials which exhibit continuousferroquadrupole phase transitions, motivating the search for additionalmaterials that fall in to this category. Furthermore, it is not clear a prioriwhether experimental approaches based on transport measurements which have beensuccessfully used to probe the nematic susceptibility in materials such as theFe-based superconductors, will be as effective in the case of $4f$intermetallic materials, for which the important electronic degrees of freedomare local rather than itinerant and are consequently less strongly coupled tothe charge-carrying quasiparticles near the Fermi energy. In the present work,we demonstrate that the intermetallic compound YbRu$_2$Ge$_2$ exhibits atetragonal-to-orthorhombic phase transition consistent with ferroquadrupoleorder of the Yb ions, and go on to show that elastoresistivity measurements canindeed provide a clear window on the diverging nematic susceptibility in thissystem. This material provides a new arena in which to study the causes andconsequences of electronic nematicity.

Divergence of the quadrupole-strain susceptibility of YbRu$_2$Ge$_2$; a local moment realization of electronic nematicity