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The bulk magnetic susceptibility $\chi(T,B)$ ofYbRh$_2$(Si$_{0.95}$Ge$_{0.05}$)$_2$ has been investigated %by ac-anddc-magnetometry at low temperatures and close to the field-induced quantumcritical point at $B_c=0.027$ T. For $B\leq 0.05$ T a Curie-Weiss law with anegative Weiss temperature is observed at temperatures below 0.3 K. Outsidethis region, the susceptibility indicates ferromagnetic quantum criticalfluctuations: $\chi(T)\propto T^{-0.6}$ above 0.3 K, while at low temperaturesthe Pauli susceptibility follows $\chi_0\propto (B-B_c)^{-0.6}$ and scales withthe coefficient of the $T^2$ term in the electrical resistivity. TheSommerfeld-Wilson ratio is highly enhanced and increases up to 30 close to thecritical field.Comment: Physical Review Letters, to be publishe

physical review letters

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Ferromagnetic Quantum Critical Fluctuations inYbRh2(Si0.95