Abstract
At a generic quantum critical point, the thermal expansion is more singular than the specific heat . Consequently, the “Grüneisen ratio,” , diverges. When scaling applies, at the critical pressure , providing a means to measure the scaling dimension of the most relevant operator that pressure couples to; in the alternative limit and , with a prefactor that is, up to the molar volume, a simple universal combination of critical exponents. For a magnetic-field driven transition, similar relations hold for the magnetocaloric effect . Finally, we determine the corrections to scaling in a class of metallic quantum critical points.
- Received 19 December 2002
DOI:https://doi.org/10.1103/PhysRevLett.91.066404
©2003 American Physical Society