  Ultracold atomic Fermi gases can be tuned to interact strongly, where they
display spectroscopic signatures above the superfluid transition reminiscent of
the pseudogap in cuprates. However, the extent of the analogy can be
questioned, since thermodynamic quantities in the low temperature
spin-imbalanced normal state can be described successfully using Fermi liquid
theory. Here we present spin susceptibility measurements across the interaction
strength-temperature phase diagram using a novel radiofrequency technique with
ultracold $^6\textrm{Li}$ gases. For all significant interaction strengths and
at all temperatures we find the spin susceptibility is reduced compared with
the equivalent value for a non-interacting Fermi gas, with the low temperature
results consistent with previous studies. However, our measurements extend to
higher temperatures, where we find that the reduction persists consistently
with a mean-field scenario. At unitarity, we can use the local density
approximation to extract the spin susceptibility for the uniform gas, which is
well described by mean-field models at temperatures from the superfluid
transition to the Fermi temperature.
