Anomalous scaling behavior of the dynamical spin susceptibility of Ce$_{0.925}$La$_{0.075}$Ru$_{2}$Si$_{2}$

W. Knafo; S. Raymond; J. Flouquet; B. Fåk; M. A. Adams; P. Haen; F. Lapierre; S. Yates; P. Lejay

doi:10.1103/PhysRevB.70.174401

paper

Anomalous scaling behavior of the dynamical spin susceptibility of Ce $_{0.925}$ La $_{0.075}$ Ru $_{2}$ Si $_{2}$

arXiv:cond-mat/0404124 · doi:10.1103/PhysRevB.70.174401

Abstract

Inelastic neutron scattering measurements have been performed on single crystals of the heavy fermion compound Ce $_{0.925}$ La $_{0.075}$ Ru $_{2}$ Si $_{2}$ in broad energy [0.1, 9.5 meV] and temperature [40 mK, 294 K] ranges in order to address the question of scaling behavior of the dynamical spin susceptibility at the quantum critical point of an itinerant magnetic system. For two wavevectors $Q$ corresponding to uncorrelated and antiferromagnetically correlated spin fluctuations, it is found that the dynamical spin susceptibility $χ^{''} (Q, E, T)$ is independent of temperature below a cut-off temperature $T_{Q}$ : the spin fluctuation amplitude saturates at low temperatures contrarily to its expected divergence at a quantum critical point. Above $T_{Q}$ , a $Q$ -dependent scaling behavior of the form $T χ^{''} (Q, E, T) = C_{Q} f [E / (a_{Q} T^{β_{Q}})]$ with $β_{Q} < 1$ is obtained. This scaling does not enter the general framework of quantum phase transition theories, since it is obtained in a high temperature range, where Kondo spin fluctuations depend strongly on temperature.

8 pages, 6 figures

Anomalous scaling behavior of the dynamical spin susceptibility of Ce $_{0.925}$ La $_{0.075}$ Ru $_{2}$ Si $_{2}$

Abstract

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Anomalous scaling behavior of the dynamical spin susceptibility of Ce0.925​La0.075​Ru2​Si2​

Abstract

References in corpus (3)

Cited by in corpus (11)

Anomalous scaling behavior of the dynamical spin susceptibility of Ce $_{0.925}$ La $_{0.075}$ Ru $_{2}$ Si $_{2}$