Dynamical properties of magnetically frustrated pyrochlore system Tb 2Ti 2O 7

Abstract

Neutron scattering studies have been carried out on a single crystal of a pyrochlore compound Tb 2Ti 2O 7 with geometrically frustrated magnetic moments. The temperature ( T) dependence of the dynamical magnetic properties and dispersion curves of the magnetic excitation have been studied in detail, where we have identified the pattern of the short-range magnetic correlation and determined the T-dependence of the correlation length. Neutron measurements in the magnetic fields ( H ) up to 4.5 T applied along the [1 1 ̄ 1] direction have also been carried out. The magnetic scattering intensity increases at several nuclear Bragg points with increasing H . Although the magnetic structure has not been determined, the results seem to indicate that an antiferromagnetic long-range order is induced by applying the relatively small magnetic field.