Magnetic field induced non-Fermi liquid to Fermi liquid crossover at the quantum critical point of YbCu$_{5-x}$Au$_{x}$

P. Carretta; R. Pasero; M. Giovannini; C. Baines

doi:10.1103/PhysRevB.79.020401

paper

Magnetic field induced non-Fermi liquid to Fermi liquid crossover at the quantum critical point of YbCu $_{5 - x}$ Au $_{x}$

arXiv:0809.2685 · doi:10.1103/PhysRevB.79.020401

Abstract

The temperature (T) dependence of the muon and $^{63}$ Cu nuclear spin-lattice relaxation rates $1/ T_{1}$ in YbCu4.4Au0.6 is reported over nearly four decades. It is shown that for $T \to 0$ $1/ T_{1}$ diverges following the behaviour predicted by the self-consistent renormalization (SCR) theory developed by Moriya for a ferromagnetic quantum critical point. On the other hand, the static uniform susceptibility $χ_{s}$ is observed to diverge as $T^{- 2/3}$ and $1/ T_{1} T \propto χ_{s}^{2}$ , a behaviour which is not accounted for by SCR theory. The application of a magnetic field $H$ is observed to induce a crossover to a Fermi liquid behaviour and for $T \to 0$ $1/ T_{1}$ is found to obey the scaling law $1/ T_{1} (H) = 1/ T_{1} (0) [1 + (μ_{B} H / k_{B} T)^{2}]^{- 1}$ .

4 pages, 4 figures

Magnetic field induced non-Fermi liquid to Fermi liquid crossover at the quantum critical point of YbCu5−x​Aux​

Abstract

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Magnetic field induced non-Fermi liquid to Fermi liquid crossover at the quantum critical point of YbCu $_{5 - x}$ Au $_{x}$