Interplay of disorder and spin fluctuations in the resistivity near a quantum critical point

Abstract

The resistivity in metals near an antiferromagnetic quantum critical point (QCP) is strongly affected by small amounts of disorder. In a quasi-classical treatment, we show that an interplay of strongly anisotropic scattering due to spin fluctuations and isotropic impurity scattering leads to a large regime where the resistivity varies as T^alpha, with an anomalous exponent, alpha, 1 <= alpha <= 1.5, depending on the amount of disorder. I argue that this mechanism explains in some detail the anomalous temperature dependence of the resistivity observed in CePd_2Si_2, CeNi_2Ge_2 and CeIn_3 near the QCP.

4 pages, 4 eps figures, published version, only small changes

References in corpus (2)

• Two-dimensional fluctuations at the quantum-critical point of CeCu_{6-x}Au_x
• Scaling of magnetic fluctuations near a quantum phase transition

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