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310 Handbook on the Physics and Chemistry of Rare Earths 55 45 140 35 x = 0.1 Iôb 0.4 0.6 120 100 80 60 40 20 0 0 0.2 x= 0 x = 0.05 x = 0.1 x = 0.15 x = 0.2 x = 0.3 FIG. 9 Electrical resistivity, r, of Ce(Cu6xAux) from 0 to 0.3 concentration tuning. The r (T) curves illustrate the change of behavior from HFL (T2) to NFL (T) to a constant resistivity due to the strong disorder of Aux doping. Here, the antiferromagnetic transition is hardly discern- ible because of the large disorder scattering. According to von Lo€hneysen, H., Rosch, A., Vojta, M., Wo€lfle, P., 2007. Fermi-liquid instabilities at magnetic quantum phase transitions. Rev. Mod. Phys. 79 (3), 1015-1075. Further inelastic neutron scattering probed the critical fluctuations at xc (Stockert et al., 1998). The spin fluctuations appeared to be highly anisotropic leading to a rod-like formation of excitations in the dynamical structure factor S(q, o). In real space, this corresponds to quasi-2D fluctuations (Rosch et al., 1997). The dynamical structure factor S(q1⁄4const, o) resulted in a dynamical scaling of the dynamical susceptibility in o/T (Schr€oder et al., 2000). Interest- ingly, HM theory is incompatible with such o/T scaling, indicating the need for new theories. The third way to tune the system is through an external applied magnetic field H. Since Aux dilution can be reversed with hydrostatic pressure, the field tuning should have similar effects to diminish the AFM and return the com- pound CeCu6xAux to its QCP at xc 1⁄4 0.1. Such experiments were performed on a single crystal of CeCu5.8Au0.2 with H along its easy axis, measuring a T (K) Au , I 0 0.2 0.4 0.6 0.8 1 CeCu 6–x x ô T (K) r (mW cm) r (mW cm)PDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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