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Novel quantum criticality in CeRu2Si2 near absolute zero observed by thermal expansion and magnetostriction
J Yoshida1, S Abe, D Takahashi
1Department of Physics, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan.
Abstract:
We report linear thermal expansion and magnetostriction measurements for CeRu2Si2 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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