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Elastic neutron scattering, ac susceptibility, and specific heat experimentson the pyrochlores Er$_{2}$Ge$_{2}$O$_{7}$ and Yb$_{2}$Ge$_{2}$O$_{7}$ showthat both systems are antiferromagnetically ordered in the $\Gamma_5$ manifold.The ground state is a $\psi_{3}$ phase for the Er sample and a $\psi_{2}$ or$\psi_{3}$ phase for the Yb sample, which suggests "Order by Disorder"(ObD)physics. Furthermore, we unify the various magnetic ground states of all knownR$_{2}$B$_{2}$O$_{7}$ (R = Er, Yb, B = Sn, Ti, Ge) compounds through theenlarged XY type exchange interaction $J_{\pm}$ under chemical pressure. Themechanism for this evolution is discussed in terms of the phase diagramproposed in the theoretical study [Wong et al., Phys. Rev. B 88, 144402,(2013)].

Ground state selection in XY pyrochlore antiferromagnets R$_{2}$Ge$_{2}$O$_{7}$ (R = Er, Yb)