Quantum oscillations in heavy fermion compound YbPtBi

TL;DR

This study reports quantum oscillations in YbPtBi at high magnetic fields, revealing small effective masses of conduction electrons and providing insights into Kondo screening suppression in heavy fermion systems.

Contribution

First observation of quantum oscillations in YbPtBi at high fields, demonstrating small effective masses and the suppression of heavy fermion behavior by magnetic fields.

Findings

Quantum oscillations observed at fields as low as 60 kOe and temperatures up to 3 K.

Effective masses of quasiparticles are close to the bare electron mass.

Magnetic field suppresses the large electronic specific heat coefficient.

Abstract

We present quantum oscillations observed in the heavy fermion compound YbPtBi in magnetic fields far beyond its field-tuned, quantum critical point. Quantum oscillations are observed in magnetic fields as low as 60 kOe at 60 mK and up to temperatures as high as 3 K, which confirms the very high quality of the samples as well as the small effective mass of conduction carriers far from the quantum critical point. Although the electronic specific heat coefficient of YbPtBi reaches ~ 7.4 J/mol K2 in zero field, which is one of the highest effective mass value among heavy fermion systems, it is suppressed quickly by applied magnetic field. The quantum oscillations were used to extract the quasiparticle effective masses of the order of the bare electron mass, which is consistent with the behavior observed in specific heat measurements. Such a small effective masses at high fields can be understood by considering the suppression of Kondo screening.