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We report neutron scattering and muon spin relaxation measurements (muSR) onthe pyrochlore antiferromagnet Yb2Ge2O7. Inelastic neutron scattering was usedto probe the transitions between crystal electric field levels, allowing us todetermine the eigenvalues and eigenvectors appropriate to the J=7/2 Yb3+ ion inthis environment. The crystal electric field ground state doublet in Yb2Ge2O7corresponds primarily to m_J = +/- 1/2 with local XY anisotropy, consistentwith an S_eff = 1/2 description for the Yb moments. muSR measurements revealthe presence of an ordering transition at T_N = 0.57 K with persistent weakdynamics in the ordered state. Finally, we present neutron diffractionmeasurements that reveal a clear phase transition to the k = (000) Gamma_5ground state with an ordered magnetic moment of 0.3(1) mu_B per Yb ion. Wecompare and contrast this phenomenology with the low temperature behavior ofYb2Ti2O7 and Er2Ti2O7, the prototypical S_eff = 1/2 XY pyrochlore magnets.

XY Antiferromagnetic Ground State in the Effective S=1/2 Pyrochlore Yb2Ge2O7