Abstract
We have determined the effect of hydrostatic pressure on the susceptibility, on the ${T}^{2}$ temperature dependence of the spin-fluctuation resistivity, and on superconductivity in ${\mathrm{UPt}}_{3}$. The spin-fluctuation temperature ${T}_{s}$, derived from the slope of resistivity versus ${T}^{2}$, is used within a Fermi-liquid picture to calculate the susceptibility \ensuremath{\chi} at T=0 K. The depression of this calculated \ensuremath{\chi} with pressure agrees with the directly measured value \ensuremath{\partial} ln\ensuremath{\chi}/\ensuremath{\partial}P=-24 ${\mathrm{Mbar}}^{\mathrm{\ensuremath{-}}1}$. Both the superconducting transition temperature ${T}_{c}$ and the initial slope of the upper critical field also decrease under pressure. We find that \ensuremath{\partial} ln${T}_{c}$/\ensuremath{\partial}P=-25 ${\mathrm{Mbar}}^{\mathrm{\ensuremath{-}}1}$ and speculate upon correlations between \ensuremath{\chi} and ${T}_{c}$.
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