Neutron thermometry applied to magnetization and spin-lattice relaxation measurements on silver nuclei

We have studied spin-lattice relaxation in silver metal at temperatures and magnetic fields beyond the validity of the normal Korringa relation tau(1) = kappa/T-e using transmission of polarized and unpolarized neutrons. For the Korringa constant of Ag-109 we obtained kappa = (10.0+/-0.3) sK. Unpolarized neutrons were also used to measure the critical value of antropy S for nuclear antiferromagnetic ordering and to determine the induced magnetization M in the ordered state. The nuclear susceptibility chi = mu(0)M/B = 0.36+/-0.01 was found to be constant, independent of S and B (B-c approximate to 100 mu T).