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  Ruff, J.P.C.; Gaulin, B.D.; Rule, K.C.; Gardner, J.S.: Superlattice correlations in Tb₂Ti₂O₇ under the application of [110] magnetic field. Physical Review B 82 (2010), p. 100401(R)/11-4

10.1103/PhysRevB.82.100401

Abstract:
We report an analysis of neutron diffraction from single crystals of the spin-liquid pyrochlore Tb2Ti2O7 under the application of magnetic fields along the crystallographic 110 direction. Such a perturbation has been shown to destroy the spin-liquid ground state and induce long-range order, although the nature of the ordered state was not immediately determined. Recently, it has been proposed that the ordered state is characterized by spin-ice-like correlations, evincing an emergent ferromagnetic tendency in this material despite the large negative Curie-Weiss constant. Here, we argue instead that the ordered state is dominated by Q
0 correlations that emerge either from strong antiferromagnetism or magnetoelastic distortion of the crystal. In contrast to previous reports, we observe no evidence for re-entrant behavior in the high-field limit. Extreme sensitivity of the ordered state to the alignment of the applied field is suggested to account for these discrepancies.