Field Induced Order and Spin Waves in the Pyrochlore Antiferromagnet Tb2Ti2O7
Rule, K. C. · Ruff, J. P. C. · Gaulin, B. D. · Dunsiger, S. R. · Gardner, J. S. · Clancy, J. P. · Lewis, M. J. · Dabkowska, H. A. · Mirebeau, I · Manuel, P. · Qiu, Y. · Copley, J. R. D.
Original · EN
High resolution time-of-flight neutron scattering measurements on Tb2Ti2O7 reveal a rich low temperature phase diagram in the presence of a magnetic field applied along [110]. In zero field at T=0.4 K, terbium titanate is a highly correlated cooperative paramagnet with disordered spins residing on a pyrochlore lattice of corner-sharing tetrahedra. Application of a small field condenses much of the magnetic diffuse scattering, characteristic of the disordered spins, into a new Bragg peak characteristic of a polarized paramagnet. At higher fields, a magnetically ordered phase is induced, which supports spin wave excitations indicative of continuous, rather than Ising-like spin degrees of freedom.
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