HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS

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HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS ( handbook-onphysics-and-chemistry-rare-earths )

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308 Handbook on the Physics and Chemistry of Rare Earths FIG. 7 2.5 2.0 1.5 1.0 0.5 CeCu6–xAux 4 3 2 1 0 0.0 0.5 Single crystals Polycrystals 1.0 1.5 x x p (kbar) 00 0.1 0 0.15 0 0.2 0 0.3 0 0.1 6.0 0.2 4.1 0.3 8.2 CeCu6–xAux 0.1 1 4 T (K) Specific heat of CeCu6xAux vs log(T) for various tuning parameters Aux concentration and hydrostatic pressure near the QCP at xc 1⁄4 0.1. Note the behavior of C/T is logarithmic at xc signifying the QCP. There are slight deviations from FL behavior (C/T% constant) at xxc. Pressure restores the lower x behavior, ie, removes the AFM-order and generates a return to quantum criticality and FL behavior. The upper panel traces the AFM Ne`el temperature as a function of x for single and polycrystal samples. Note how TN becomes reduced as x increases above 1.0. This illustrates the disorder effects of large gold dilutions probably affecting the band structure and Fermi surface of CeCu6. 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. magnetic field H applied along c. There is a near constant in T dependence for x1⁄40 and the gradual low temperature upturn at xc, with the antiferromagnetic order only becoming apparent at x1⁄40.3. The susceptibility behavior at the pffiffiffi QCP follows a w 1⁄4 w0 d T dependence. Spin fluctuations seem to be modifying the x 1⁄4 0 FL state where w should be constant as T ! 0. C/T (J/mol K2) TN (K)

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