Knight Shifts and Susceptibilities of Transition Metals: Palladium

摘要: The nuclear magnetic resonance (NMR) of ${\mathrm{Pd}}^{105}$ has been observed for the first time. temperature dependence NMR in palladium metal was studied region 1.4 to 300\ifmmode^\circ\else\textdegree\fi{}K. relatively large linewidth ($\ensuremath{\delta}H=9\ifmmode\pm\else\textpm\fi{}2$ Oe) at all temperatures necessitated use continuous averaging techniques obtain requisite sensitivity. field resonance, a fixed frequency, found have maximum vicinity 85\ifmmode^\circ\else\textdegree\fi{}K, as does susceptibility $\ensuremath{\chi}(T)$. From an analysis Knight shift $K(T)$ and $\ensuremath{\chi}(T)$ it deduced that: (1) $d$-spin paramagnetism is responsible behavior $\ensuremath{\chi}(T)$, (2) principle contribution $K$ Pd arises from $d$-spin-induced core polarization (3) core-polarization hyperfine ${H}_{\mathrm{cp}}=\ensuremath{-}689\ifmmode\pm\else\textpm\fi{}20$kOe/spin. partitioning various contributions $K$, $\ensuremath{\chi}$, specific heat, estimated value $\frac{1}{{T}_{1}}\ensuremath{\simeq}0.8T$ ${\mathrm{sec}}^{\ensuremath{-}1}$ \ifmmode^\circ\else\textdegree\fi{}K obtained spin-lattice relaxation rate low temperatures. It shown that "knee" not associated with static antiferromagnetic ordering; upper limit ${10}^{\ensuremath{-}5}$ ${\mathrm{\ensuremath{\mu}}}_{\mathit{B}}$ per atom spontaneous moment obtained. A diamagnetically uncorrected ${\ensuremath{\mu}}^{105}=\ensuremath{-}0.639\ifmmode\pm\else\textpm\fi{}0.003$ nm determined.