2005/01/25 by P. Gegenwart, J. Custers, Y. Tokiwa +2 · 3 citations
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.94.076402
published as Phys. Rev. Lett. 94, 076402 (2005). · Physical Review Letters, to be published
arxiv created 2005/01/25 · openalex publication_date 2005/02/23 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
The bulk magnetic susceptibility \ensuremathχ(T,B) of YbRh2(Si0.95Ge0.05)2 has been investigated close to the field-induced quantum critical point at Bc=0.027 T. For B\ensuremath≤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, \ensuremathχ(T)\ensuremath∝T^\ensuremath-0.6 above 0.3 K. At low temperatures the Pauli susceptibility follows \ensuremathχ0\ensuremath∝(B\ensuremath-Bc)^\ensuremath-0.6 and scales with the coefficient of the T2 term in the electrical resistivity. The Sommerfeld-Wilson ratio is highly enhanced and increases up to 30 close to the critical field.