Lattice-site determination by magnetic hyperfine interaction for implanted 54Fe ions in alpha - and gamma -cerium.

A pronounced difference in magnetic behavior at distinct lattice sites has been found for recoil-implanted 54 Fe ions in fcc cerium metal using the perturbed-angular-distribution method. Of the implanted ions 25(5)% show predominantly spin magnetism while 75(5)% appear to be nonmagnetic. Based on the Anderson model, the magnetic fraction is assigned to regular lattice sites and the nonmagnetic fraction is inferred to occupy interstitial positions. This interpretation is supported by Monte Carlo simulations describing the transport of ions in matter