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Journal of the Physical Society of Japan, December 15, 2017, Vol. 86, No. 12 Non-Fermi-Liquid Behavior in CeRu₂Si₂ at Ultralow Temperatures Studied by Thermal Expansion and Magnetostriction Daiki Inoue, Hiroyuki Takama, Daisuke Kaidou, Mitsuyuki Minegishi, Keisuke Ueno, Koichi Matsumoto, Satoshi Abe, Shigeyuki Murayama https://doi.org/10.7566/JPSJ.86.124712

Abstract

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We report the linear thermal expansion and magnetostriction of the heavy-fermion compound CeRu₂Si₂ along its a- and c-axes at temperatures down to 10 mK and in magnetic fields up to 9 T using a high-precision capacitive dilatometer. From the magnetostriction measurements, a large anisotropy between values for the coefficient of magnetostriction along the a- and c-axes was found in the Landau–Fermi-liquid (LFL) state. Non-Fermi-liquid (NFL) behavior was observed for both the linear thermal expansion below 60 mK for all applied magnetic fields and the linear magnetostriction below 0.5 T and 300 mK. The results suggest the existence of an additional pressure-driven quantum critical point (QCP), and a crossover from the NFL state to the LFL state occurs in CeRu₂Si₂ at ambient pressure near the QCP.

https://doi.org/10.7566/JPSJ.86.124712

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