Pressure dependence of the magnetic susceptibility of pure Pd to 3.7 GPa from 1.3 to 300 K

The temperature and pressure dependences of the static magnetic susceptibility $\ensuremath{\chi}$ of pure Pd were determined from 4 to 300 K and 0 to 1.5 GPa. The susceptibility is found to decrease slowly with pressure at all temperatures: at 300 K, $\frac{\ensuremath{\partial}\mathrm{ln}\ensuremath{\chi}}{\ensuremath{\partial}P}=\frac{(\ensuremath{-}1.05\ifmmode\pm\else\textpm\fi{}0.10)%}{\mathrm{GPa}}$, giving $\frac{\ensuremath{\partial}\mathrm{ln}\ensuremath{\chi}}{\ensuremath{\partial}\mathrm{ln}V}=+1.9\ifmmode\pm\else\textpm\fi{}0.2$; at 4 K, $\frac{\ensuremath{\partial}\mathrm{ln}\ensuremath{\chi}}{\ensuremath{\partial}P}=\frac{(\ensuremath{-}1.55\ifmmode\pm\else\textpm\fi{}0.30)%}{\mathrm{GPa}}$, giving $\frac{\ensuremath{\partial}\mathrm{ln}\ensuremath{\chi}}{\ensuremath{\partial}\mathrm{ln}V}=+2.8\ifmmode\pm\else\textpm\fi{}0.5$. Extrapolating these results to negative pressures indicates that the enhanced magnetism found in Au-Pd-Au sandwiches by Brodsky and Freeman cannot be due to a simple volume expansion of the Pd film alone. In pure Pd no superconductivity is observed above 1.3 K to hydrostatic pressures as high as 3.7 GPa.

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