标题： 重费米子化合物YbPtBi中的量子振荡 显示英文标题

标题： Quantum oscillations in heavy fermion compound YbPtBi

摘要： 我们展示了在重费米子化合物YbPtBi中观察到的量子振荡，这些振荡是在远超其场调谐量子临界点的磁场下发生的。 在60 mK时，量子振荡在低至60 kOe的磁场以及高达3 K的温度下被观察到，这证实了样品的高质量以及在远离量子临界点时导电载流子的小有效质量。 尽管YbPtBi在零磁场下的电子比热系数达到约7.4 J/mol K2，这是重费米子系统中最高的有效质量值之一，但该系数会迅速被施加的磁场抑制。 利用量子振荡提取了准粒子有效质量，其数量级接近自由电子质量，这与比热测量中观察到的行为一致。 在高磁场下如此小的有效质量可以通过考虑Kondo屏蔽的抑制来理解。 显示英文摘要

摘要： 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.