Heavy fermion behavior of U&X co R. Osborn, Chairman

Magnetic and specific-heat studies of U,T& compounds show a frequent occurrence of the y enhancement in conjunction with the onset of antiferromagnetic ordering. The largest value of 830 mJ/mol K2 was observed in U,Pt,In, which is nonmagnetic down to 1.2 K. Variations of electronic structure are documented by optimized relativistic LCAO calculation. I. INTRODUCTION Magnetic and other electronic properties of light ac- tinides in intermetallic compounds are strongly affected by the hybridization of the