title: Field-induced order and spin waves in the pyrochlore antiferromagnet Tb2Ti207.
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.
authors.affiliation: Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada.
authors.forename: K C
authors.initials: KC
authors.lastname: Rule
authors.forename: J P C
authors.initials: JP
authors.lastname: Ruff
authors.forename: B D
authors.initials: BD
authors.lastname: Gaulin
authors.forename: S R
authors.initials: SR
authors.lastname: Dunsiger
authors.forename: J S
authors.initials: JS
authors.lastname: Gardner
authors.forename: J P
authors.initials: JP
authors.lastname: Clancy
authors.forename: M J
authors.initials: MJ
authors.lastname: Lewis
authors.forename: H A
authors.initials: HA
authors.lastname: Dabkowska
authors.forename: I
authors.initials: I
authors.lastname: Mirebeau
authors.forename: P
authors.initials: P
authors.lastname: Manuel
authors.forename: Y
authors.initials: Y
authors.lastname: Qiu
authors.forename: J R D
authors.initials: JR
authors.lastname: Copley