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ac susceptibility and static magnetization measurements of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CeRu</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Si</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>at small magnetic fields and ultralow temperatures
The magnetic properties of ${\mathrm{CeRu}}_{2}{\mathrm{Si}}_{2}$ at microkelvin temperatures (down to $170\ensuremath{\mu}\mathrm{K})$ and ultrasmall magnetic fields $(0.02\ensuremath{\sim}6.21\mathrm{mT})$ are investigated experimentally. 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 …