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

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dc.creatorKnafo, W.
dc.creatorRaymond, S.
dc.creatorFlouquet, J.
dc.creatorFåk, B.
dc.creatorAdams, M. A.
dc.creatorHaen, P.
dc.creatorLapierre, F.
dc.creatorYates, S.
dc.creatorLejay, P.
dc.date2004-04-06
dc.date2004-07-05
dc.date.accessioned2026-07-07T02:57:27Z
dc.date.available2026-07-07T02:57:27Z
dc.descriptionInelastic 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 $\mathbf{Q}$ corresponding to uncorrelated and antiferromagnetically correlated spin fluctuations, it is found that the dynamical spin susceptibility $χ''(\mathbf{Q},E,T)$ is independent of temperature below a cut-off temperature $T_{\mathbf{Q}}$: the spin fluctuation amplitude saturates at low temperatures contrarily to its expected divergence at a quantum critical point. Above $T_{\mathbf{Q}}$, a $\mathbf{Q}$-dependent scaling behavior of the form $Tχ''(\mathbf{Q},E,T) = C_{\mathbf{Q}}f[E/(a_{\mathbf{Q}}T^{β_{\mathbf{Q}}})]$ with $β_{\mathbf{Q}}<1$ 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.
dc.description8 pages, 6 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0404124
dc.identifierhttp://arxiv.org/abs/cond-mat/0404124
dc.identifierPhys. Rev. B 70, 174401 (2004)
dc.identifierdoi:10.1103/PhysRevB.70.174401
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/23675
dc.subjectStrongly Correlated Electrons
dc.titleAnomalous scaling behavior of the dynamical spin susceptibility of Ce$_{0.925}$La$_{0.075}$Ru$_{2}$Si$_{2}$
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