Tunable non-Lifshitz-Kosevich temperature dependence of Shubnikov-de Haas oscillation amplitudes in SmSb

TL;DR

This study reveals that the temperature dependence of Shubnikov-de Haas oscillations in SmSb can be tuned from anomalous to enhanced behavior by adjusting sample purity, challenging traditional Lifshitz-Kosevich theory.

Contribution

It demonstrates that sample purity influences the temperature dependence of quantum oscillations, enabling control over non-LK behaviors in SmSb.

Findings

Observed departure from LK theory near 2.4 K in SmSb

Tuning sample purity alters the SdH amplitude behavior

Identified a connection between non-LK behaviors and sample conditions

Abstract

The Lifshitz-Kosevich (LK) theory is the pillar of magnetic quantum oscillations, which have been extensively applied to characterize a wide range of metallic states. In this study, we focus on the Shubnikov-de Haas (SdH) effect observed in SmSb, a rare-earth monopnictide. We observed a significant departure from the expected LK theory near $T_N=2.4$~K: both a peak-like anomaly and an enhancement in the temperature dependence of quantum oscillation amplitude are seen in SmSb. Moreover, we discovered a remarkable sensitivity of the SdH amplitudes to sample purity. By adjusting the sample purity, we were able to tune the temperature dependence of the $\alpha$ band's SdH amplitudes from a peak-like anomalous behavior to an enhancement. Therefore, SdH oscillations from the $\alpha$ band connect the two well-known non-LK behaviours, controllable through varying the sample purity, paving the way for developing further understanding of the mechanism leading to the anomalous quantum oscillations.