Continuous Evolution of the Fermi Surface of CeRu2Si2 across the Metamagnetic Transition

TL;DR

This study uses high-resolution Hall effect and magnetoresistance measurements to demonstrate that the Fermi surface of CeRu2Si2 evolves continuously across its metamagnetic transition, challenging previous notions of abrupt f-electron localization.

Contribution

It provides new experimental evidence supporting a continuous Fermi surface evolution, offering a reinterpretation of the metamagnetic transition in CeRu2Si2.

Findings

Fermi surface changes continuously across the transition

Challenges the idea of abrupt f-electron localization

Addresses ambiguities in dHvA data interpretation

Abstract

We present new, high resolution Hall effect and magnetoresistance measurements across the metamagnetic transition in the heavy fermion compound CeRu2Si2. The results force us to rethink the notion that the transition is accompanied by an abrupt f-electron localisation. Instead, we explain our data assuming a continuous change of the Fermi surface. We also point out ambiguities in the interpretation of dHvA data and give a possible solution to the problem of the "missing mass".