Magnetic properties near the non-Fermi-liquid regime in the antiferromagnetic heavy-fermion compound YbAgGe

Measurements of the magnetoresistance down to 75 mK give indications for the evolution of the magnetic ground state of YbAgGe from antiferromagnetic order at zero field to a field polarised state at high fields. In particular, the feature at 5 T closest to the field range, where non-Fermi-liquid behaviour had been previously observed, is associated with an increase of the field-induced ferromagnetic component. (c) 2006 Published by Elsevier B.V.