Non-Fermi-liquid effects at ambient pressure in the stoichiometric heavy-fermion compound YbRh2Si2

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Abstract

Strong deviations from the properties of a heavy Landau Fermi-liquid already at ambient pressure and zero field are reported for single-crystalline YbRh2Si2. The low-temperature specific-heat coefficient and the electrical resistivity show a logarithmic and a linear temperature dependence, respectively, in more than a decade in temperature. This anomalous metallic state is ascribed to the proximity of a very nearby magnetic instability. Application of hydrostatic pressure induces anomalies in the electrical resistivity, indicating the onset of long-range magnetic order at a critical pressure pc≃0.5GPa, which is so far the lowest required for the onset of magnetism in Yb compounds.

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