Field-induced order and spin waves in the pyrochlore antiferromagnet Tb2Ti207 |
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Authors: | 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 |
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Affiliation: | Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada. |
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Abstract: | High resolution time-of-flight neutron scattering measurements on Tb(2)Ti(2)0(7) 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, Tb(2)Ti(2)0(7) 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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