Field-induced order and spin waves in the pyrochlore antiferromagnet Tb2Ti207.
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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Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada.
Ruff
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JP
Gaulin
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Dunsiger
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Gardner
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JS
Clancy
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JP
Lewis
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MJ
Dabkowska
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Mirebeau
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I
Manuel
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Qiu
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Copley
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