Evidence for charge delocalization crossover in the quantum critical superconductor CeRhIn₅.

ABSTRACT: The nature of charge degrees-of-freedom distinguishes scenarios for interpreting the character of a second order magnetic transition at zero temperature, that is, a magnetic quantum critical point (QCP). Heavy-fermion systems are prototypes of this paradigm, and in those, the relevant question is where, relative to a magnetic QCP, does the Kondo effect delocalize their f-electron degrees-of-freedom. Herein, we use pressure-dependent Hall measurements to identify a finite-temperature scale E_loc that signals a crossover from f-localized to f-delocalized character. As a function of pressure, E_loc(P) extrapolates smoothly to zero temperature at the antiferromagnetic QCP of CeRhIn₅ where its Fermi surface reconstructs, hallmarks of Kondo-breakdown criticality th

SUBMITTER: Wang H 

PROVIDER: S-EPMC10643617 | biostudies-literature | 2023 Nov

REPOSITORIES: biostudies-literature