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The origin of the spin liquid state in Tb$_2$Ti$_2$O$_7$ has challengedexperimentalists and theorists alike for nearly 20 years. To improve ourunderstanding of the exotic magnetism in Tb$_2$Ti$_2$O$_7$, we have synthesizeda chemical pressure analog, Tb$_2$Ge$_2$O$_7$. Germanium substitution resultsin a lattice contraction and enhanced exchange interactions. We havecharacterized the magnetic ground state of Tb$_2$Ge$_2$O$_7$ with specificheat, ac and dc magnetic susceptibility, and polarized neutron scatteringmeasurements. Akin to Tb$_2$Ti$_2$O$_7$, there is no long-range order inTb$_2$Ge$_2$O$_7$ down to 20 mK. The Weiss temperature of $-$19.2(1) K, whichis more negative than that of Tb$_2$Ti$_2$O$_7$, supports the picture ofstronger antiferromagnetic exchange. Polarized neutron scattering ofTb$_2$Ge$_2$O$_7$ reveals that at 3.5 K liquid-like correlations dominate inthis system. However, below 1 K, the liquid-like correlations give way tointense short-range ferromagnetic correlations with a length scale related tothe Tb-Tb nearest neighbor distance. Despite stronger antiferromagneticexchange, the ground state of Tb$_2$Ge$_2$O$_7$ has ferromagnetic character, instark contrast to the pressure-induced antiferromagnetic order observed inTb$_2$Ti$_2$O$_7$.

Incipient Ferromagnetism in Tb2Ge2O7: Application of Chemical Pressure to the Enigmatic Spin Liquid, Tb2Ti2O7