Continuous evolution of the Fermi surface of CeRu2Si2 across the metamagnetic transition

Phys Rev Lett. 2006 Jan 20;96(2):026401. doi: 10.1103/PhysRevLett.96.026401. Epub 2006 Jan 17.


We present new, high resolution Hall effect and magnetoresistance measurements across the metamagnetic transition in the heavy fermion compound CeRu2Si2 . The results, and ambiguities in the interpretation of de Haas-van Alphen data, force us to rethink the notion that the transition is accompanied by an abrupt f-electron localization. Instead, we explain our data assuming a continuous evolution of the Fermi surface, which sees one of the spin-split sheets of the heaviest surface shrink to a point.