BREAKDOWN OF HUNDS 3RD RULE FOR INDUCED MAGNETISM IN U-METAL

An example of a breakdown of Hund's third rule for a system with less than a half filled electronic shell is presented. By means of spin pol arized electronic structure calculations including the relativistic ef fects and a Zeeman term, we demonstrate that in the field induced magn etic state of uranium the spin and orbital moments are coupled paralle l rather than antiparallel as stipulated by Hund's third rule. This pr ovides an explanation for the measured field induced magnetic form fac tor of uranium metal.