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

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

2003-08-05

arxiv.org/abs/cond-mat/0308093v1

Phys. Rev. Lett. 91, 066405 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.91.066405

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$_{0.05}$)$_2$ which are located very near to quantum critical points. For both systems, $\beta$ shows a more singular temperature dependence than $C$, and thus the Grueneisen ratio ${\Gamma \propto \beta/C}$ diverges as T --> 0. For CeNi2Ge2, our results are in accordance with the spin-density wave (SDW) scenario for three-dimensional critical spin-fluctuations. By contrast, the observed singularity in YbRh2$(Si$_{0.95}$Ge$_{0.05}$)$_2$ cannot be explained by the itinerant SDW theory but is qualitatively consistent with a locally quantum critical picture.

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