Ac Susceptibility and Static Magnetization Measurements of CeRu${}_2$Si${}_2$ at Small Magnetic Fields and Ultra Low Temperatures

Abstract

The magnetic properties of CeRu${}_2$Si${}_2$ at microkelvin temperatures (down to 170 $\mu$K) and ultra small magnetic fields ($0.02\sim 6.21$ mT) are investigated experimentally for the first time. The simultaneously measured ac susceptibility and static magnetization show neither evidence of the magnetic ordering, superconductivity down to the lowest temperatures nor conventional Landau Fermi-Liquid behavior. The results imply the magnetic transition temperature in undoped CeRu${}_2$Si${}_2$ is very close to absolute 0 K. The possibility for proximity of CeRu${}_2$Si${}_2$ to the quantum critical point without any doping is discussed.

4 pages, 3 figures; accepted for publication in Phys. Rev. B (Rapid Communication) and scheduled issue on 1st of May 2003

References in corpus (3)

• Locally critical quantum phase transitions in strongly correlated metals
• Onset of antiferromagnetism in heavy fermion metals
• Magnetic-Field Induced Quantum Critical Point in YbRh${}_2$Si${}_2$

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