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000186178 1001_ $$0P:(DE-HGF)0$$aHallas, A. M.$$b0$$eCorresponding Author
000186178 245__ $$aIncipient Ferromagnetism in ${\mathrm{Tb}}_{2}{\mathrm{Ge}}_{2}{\mathrm{O}}_{7}$: Application of Chemical Pressure to the Enigmatic Spin-Liquid Compound ${\mathrm{Tb}}_{2}{\mathrm{Ti}}_{2}{\mathrm{O}}_{7}$
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000186178 520__ $$aAfter nearly 20 years of study, the origin of the spin-liquid state in Tb2Ti2O7 remains a challenge for experimentalists and theorists alike. To improve our understanding of the exotic magnetism in Tb2Ti2O7, we synthesize a chemical pressure analog: Tb2Ge2O7. Substitution of titanium by germanium results in a lattice contraction and enhanced exchange interactions. We characterize the magnetic ground state of Tb2Ge2O7 with specific heat, ac and dc magnetic susceptibility, and polarized neutron scattering measurements. Akin to Tb2Ti2O7, there is no long-range order in Tb2Ge2O7 down to 20 mK. The Weiss temperature of −19.2(1)  K, which is more negative than that of Tb2Ti2O7, supports the picture of stronger antiferromagnetic exchange. Polarized neutron scattering of Tb2Ge2O7 reveals that liquidlike correlations dominate in this system at 3.5 K. However, below 1 K, the liquidlike correlations give way to intense short-range ferromagnetic correlations with a length scale similar to the Tb-Tb nearest neighbor distance. Despite stronger antiferromagnetic exchange, the ground state of Tb2Ge2O7 has ferromagnetic character, in stark contrast to the pressure-induced antiferromagnetic order observed in Tb2Ti2O7.
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000186178 7001_ $$0P:(DE-HGF)0$$aCheng, J. G.$$b1
000186178 7001_ $$0P:(DE-HGF)0$$aArevalo-Lopez, A. M.$$b2
000186178 7001_ $$0P:(DE-HGF)0$$aSilverstein, H. J.$$b3
000186178 7001_ $$0P:(DE-Juel1)130991$$aSu, Y.$$b4$$ufzj
000186178 7001_ $$0P:(DE-HGF)0$$aSarte, P. M.$$b5
000186178 7001_ $$0P:(DE-HGF)0$$aZhou, H. D.$$b6
000186178 7001_ $$0P:(DE-HGF)0$$aChoi, E. S.$$b7
000186178 7001_ $$0P:(DE-HGF)0$$aAttfield, J. P.$$b8
000186178 7001_ $$0P:(DE-HGF)0$$aLuke, G. M.$$b9
000186178 7001_ $$0P:(DE-HGF)0$$aWiebe, C. R.$$b10
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