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312 Handbook on the Physics and Chemistry of Rare Earths 0.3 0.5 0.2 0.1 0.4 0.3 0.2 0.1 2.0 1.5 e 1.0 YbRh2Si2 B || c YbRh2(Si0.95Ge0.05)2 B ⊥ c 00 0 1 2 0 0.1 0.2 0.3 B (T) FIG. 10 by the resistivity’s T-exponent E, there is a large region of NFL behavior throughout most of the phase diagram. The color coding illustrates how the TE changes from 2 (Fermi-liquid) to 1 (NFL). On the right side, Ge alloying is used to expand the lattice, thus reducing TN, such that the critical field along the easy axis is reduced to Hc ffi 0.027 T. For small concentrations of Ge, here 5%, the lattice disorder and strain are expected to be minimal. The specific heat, plotted as C/T vs T and logT, is illustrated in Fig. 11 for different applied fields along the easy axis (Oeschler et al., 2008). The enhanced antiferromagnetic peak at TN is reduced in both temperature and magnitude with applied field H, until it disappears at the QCP, now at Hc ffi 0.06 T. The expected NFL behavior C=T $ logðT0=TÞ, becomes steeper for low temperatures T<0.3 K where it turns into a power-law C/T$T0.3. This sug- gests another entropy contribution, probably from hyperfine interactions resulting from the nuclear magnetism of the Yb nucleus. At larger H-fields, C/T is essentially constant, indicating FL behavior. The ac susceptibility and magnetization of YbRh2Si2 show deviations from their high-temperature Curie–Weiss (C-W) behavior. Fig. 12 shows the ac-susceptibility for YbRh2Si2 at various magnetic fields (Trovarelli et al., 2000). The small peak in zero field followed by flatness denote the tiny moment antiferromagnetic transition. Above the Ne`el temperature TN one Temperature vs magnetic field phase diagram of YbRh2Si2. The color contours illus- trate the temperature exponent of the resistivity: red (gray in the print version) equals linear T, blue (dark gray in the print version) quadratic T2 in the various field tuned regimes. According to Custers, J., Gegenwart, P., Wilhelm, H., Neumaier, K., Tokiwa, Y., Trovarelli, O., Geibel, C., Steglich, F., Pepin, C., Coleman, P., 2003. The break-up of heavy electrons at a quantum critical point. Nature 424 (6948), 524-527. T (K)PDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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