Novel Quantum Criticality in CeRu${}_2$Si${}_2$ near Absolute Zero Observed by Thermal Expansion and Magnetostriction

Abstract

We report linear thermal expansion and magnetostriction measurements for CeRu${}_2$Si${}_2$ in magnetic fields up to 52.6 mT and at temperatures down to 1 mK. At high temperatures, this compound showed Landau-Fermi-liquid behavior: The linear thermal expansion coefficient and the magnetostriction coefficient were proportional to the temperature and magnetic field, respectively. In contrast, a pronounced non-Fermi-liquid effect was found below 50 mK. The negative contribution of thermal expansion and magnetostriction suggests the existence of an additional quantum critical point.

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• Limits to magnetic quantum criticality from nuclear spins