Quantum Griffiths phase in CePd(1-x)Rh(x) with x ~ 0.8

Abstract

The magnetic field dependence of the magnetisation ($M$) and the temperature dependence of the ac susceptibility (${\chi }^{\prime }=dM/dH$) of CePd(1-x)Rh(x) single crystals with $0.80\le x\le 0.86$ are analysed within the frame of the quantum Griffiths phase scenario, which predicts $M\propto H^{\lambda }$ and ${\chi }^{\prime }\propto T^{\lambda -1}$ with $0\le \lambda \le 1$. All $M$ vs $H$ and ${\chi }^{\prime }$ vs $T$ data follow the predicted power-law behaviour. The parameter $\lambda$, extracted from ${\chi }^{\prime }(T)$, is very sensitive to the Rh content $x$ and varies systematically with $x$ from -0.1 to 0.4. The value of $\lambda$, derived from $M(H)$ measurements on a \cpr single crystal, seems to be rather constant, $\lambda \approx 0.2$, in a broad range of temperatures between 0.05 and 2 K and fields up to about 10 T. All observed signatures and the $\lambda$ values are thus compatible with the quantum Griffiths scenario.

4 pages, 3 figures

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• A van Hemmen-Kondo model for disordered strongly correlated electron systems
• Neutron Depolarization due to Ferromagnetism and Spin Freezing in CePd${}_{1-x}$Rh${}_x$
• Spin glassiness and power law scaling in a quasi-triangular spin-1/2 compound