Electric, magnetic, and thermal properties of (formula presented) A Kondo lattice compound showing spin glass behavior

The magnetism of (formula presented) was investigated by measuring magnetic susceptibility χ, electrical resistivity ρ, thermoelectric power S, and specific heat C. dc susceptibility shows irreversible behavior at low temperatures. In a low external magnetic field, the field-cooled susceptibility increases monotonically with decreasing temperature. On the other hand, the zero-field-cooled susceptibility shows a peak at 3.5 K, which was estimated as the freezing temperature (formula presented) The magnitude of the peak decreases with increasing field. No anomalies were found in resistivity and in specific heat at (formula presented) Instead, a broad peak of the specific heat was observed at a higher temperature (formula presented) The magnetic contribution to the specific heat (formula presented) shows a Schottky peak around 60 K, giving the scheme of crystal field splitting: (formula presented) and (formula presented) The specific heat coefficient (formula presented) was estimated to be 25 (formula presented) Ce from the data below 1 K. Magnetic resistivity shows a (formula presented) dependence from room temperature to 50 K. The thermoelectric power shows a broad positive peak around 80 K and a negative peak at 20 K. (formula presented) was found to be a new Kondo lattice compound showing spin-glass behavior. Frustration and disorder play a crucial role in the formation of the spin-glass state.