Divergence of the Grueneisen Ratio at Quantum Critical Points in Heavy Fermion Metals

R. Kuechler, N. Oeschler, P. Gegenwart +8

We present low-temperature volume thermal expansion, $\beta$, and specific heat, $C$, measurements on high-quality single crystals of CeNi2Ge2 and YbRh2(Si${}_{0.95}$Ge${}_{0.05}$)${}_2$ whi…