Dynamical magnetic properties of Tb2Ti2O7

Dynamical magnetic behavior of one of pyrochlore compounds, Tb2Ti2O7 with strong magnetic frustration has been investigated down to the temperature T - 1.5 K by thermal and cold neutron experiments. The magnetic reflections can be divided into three components, elastic, quasi elastic and inelastic ones. The T- and scattering vector (Q)-dependences of the intensity taken with cold neutrons at the elastic position of the spectrometer setting indicate that the correlation of the Tb3+ moments becomes appreciable with decreasing T at around ∼30 K and grows significantly with further decreasing T down to 5 K. A sharp increase of the intensity observed around Q=(0,0,2.1) with decreasing T from 5 K to 1.5 K suggests that large T-dependence exists even in this very low temperature region. (author)