Knight Shifts and Susceptibilities of Transition Metals: Palladium

This is the authors' abstract. We don't add key points for this paper.

The nuclear magnetic resonance (NMR) of Pd¹⁰⁵ has been observed for the first time. The temperature dependence of the Pd¹⁰⁵ NMR in palladium metal was studied in the region 1.4 to 300^∘{}K. The relatively large linewidth (δH=9±2 Oe) at all temperatures necessitated the use of continuous averaging techniques to obtain the requisite sensitivity. The field for resonance, at a fixed frequency, was found to have a maximum in the vicinity of 85^∘{}K, as does the susceptibility χ(T). From an analysis of the temperature dependence of the Knight shift $K(T)$ and of χ(T) it was deduced that: (1) d-spin paramagnetism is responsible for the observed behavior of $K(T)$ and χ(T), (2) the principle contribution to K in Pd arises from d-spin-induced core polarization and (3) the core-polarization hyperfine field Hcp=-689±20kOe/spin. From a partitioning of the various contributions to K, χ, and the specific heat, an estimated value of 1T₁0.8T sec^-1 ^∘{}K is obtained for the nuclear spin-lattice relaxation rate at low temperatures. It is shown that the "knee" in χ(T) is not associated with a static antiferromagnetic ordering; an upper limit of 10^-5 μB per Pd atom for the spontaneous moment at low temperatures is obtained. A diamagnetically uncorrected value of the Pd¹⁰⁵ nuclear moment μ¹⁰⁵=-0.639±0.003 nm was determined.