By application of the perturbed γ-ray distribution method following heavy-ion reactions, we have found an experimental method of producing and investigating strong local 4d magnetism in metals. Mo ions recoil implanted into alkali metals show a large local moment and an extremely small 4d spin-relaxation rate. The data along with an analysis using a Born-Haber cycle are consistent with a localized 4$d^5$ shell behavior for isolated Mo ions in Rb and Cs.

• Received 18 May 1987

DOI:https://doi.org/10.1103/PhysRevLett.59.1244