FERROMAGNETISM AND CRYSTAL FIELDS IN YBINNI4

We present transport and thermodynamic measurements as a function of t emperature (0.1-300 K), pressure (1 bar-16 kbars), and magnetic field (0-600 kOe) on YbInNi4. Ferromagnetism arises near 3 K out of a state with enhanced electronic specific-heat coefficient. Resistivity, speci fic-heat, and magnetization measurements imply that the ground state o f YbInNi4 is a crystal-field doublet, whereas earlier neutron-scatteri ng results suggest a ground-state quartet. We also compare YbInNi4 to YbInCu4 and intermediate alloys.