Universally diverging Grüneisen parameter and the magnetocaloric effect close to quantum critical points.

@article{Zhu2003UniversallyDG,
  title={Universally diverging Gr{\"u}neisen parameter and the magnetocaloric effect close to quantum critical points.},
  author={Lijun Zhu and Markus Garst and Achim Rosch and Qimiao Si},
  journal={Physical review letters},
  year={2003},
  volume={91 6},
  pages={066404}
}
At a generic quantum critical point, the thermal expansion alpha is more singular than the specific heat c(p). Consequently, the "Grüneisen ratio," Gamma=alpha/c(p), diverges. When scaling applies, Gamma approximately T(-1/(nu z)) at the critical pressure p=p(c), providing a means to measure the scaling dimension of the most relevant operator that pressure couples to; in the alternative limit T-->0 and p not equal p(c), Gamma approximately 1/(p-p(c)) with a prefactor that is, up to the molar… CONTINUE READING
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