  The anisotropic paramagnetism and specific heat in Nd2Ti2O7 single crystals
are investigated. Angular dependence of the magnetization and Weiss
temperatures show the dominant role of the crystal field effect in the
magnetization. By incorporating the results from the diluted samples,
contributions to Weiss temperature from exchange interactions and crystal field
interactions are isolated. The exchange interactions are found to be
ferromagnetic, while the crystal field contributes a large negative part to the
Weiss temperature, along all three crystallographic directions. The specific
heat under magnetic field reveals a two-level Schottky ground state scheme, due
to the Zeeman splitting of the ground state doublet, and the g-factors are thus
determined. These observations provide solid foundations for further
investigations of Nd2Ti2O7.

Materials Science;Other Condensed Matter