Superfluid Transition ofH4ein Porous Gold

We have measured the superfluid density and the heat capacity of ${}^4\mathrm{He}$ confined in porous gold in order to study the effect of quenched disorder on the superfluid transition. The superfluid density exponent is found to be identical to that of bulk ${}^4\mathrm{He}$ within experimental resolution. The heat capacity shows a sharp peak at the transition temperature. The size of the peak appears to be larger than that predicted by critical phenomena theory.