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Magnetic field-tuned quantum critical point in CeAuSb2


Transport, magnetic, and thermal properties at high magnetic fields (H) and low temperatures (T) of the heavy-fermion compound CeAuSb2 are reported. At H=0 this layered system exhibits antiferromagnetic order below TN=6K. Applying B along the interplane direction, leads to a continuous suppression of TN and a quantum critical point at Hc 5.4T. Although it exhibits Fermi-liquid behavior within the Néel phase, in the paramagnetic state the fluctuations associated with Hc give rise to unconventional behavior in the resistivity (sublinear in T) and to a TlnT dependence in the magnetic contribution to the specific heat. For H>Hc and low T the electrical resistivity exhibits an unusual T3 dependence. © 2005 The American Physical Society.

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