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

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