Ferromagnetic quantum critical fluctuations in YbRh_2(Si_{0.95}Ge_{0.05})_2

Abstract

The bulk magnetic susceptibility $\chi (T,B)$ of YbRh${}_2$(Si${}_{0.95}$Ge${}_{0.05}$)${}_2$ has been investigated %by ac-and dc-magnetometry at low temperatures and close to the field-induced quantum critical point at $B_c=0.027$ T. For $B\le 0.05$ T a Curie-Weiss law with a negative Weiss temperature is observed at temperatures below 0.3 K. Outside this region, the susceptibility indicates ferromagnetic quantum critical fluctuations: $\chi (T)\propto T^{-0.6}$ above 0.3 K, while at low temperatures the Pauli susceptibility follows ${\chi }_0\propto (B-B_c{)}^{-0.6}$ and scales with the coefficient of the $T^2$ term in the electrical resistivity. The Sommerfeld-Wilson ratio is highly enhanced and increases up to 30 close to the critical field.

arXiv commentPhysical Review Letters, to be published

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