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

作者：Zhang, Wei; Kuo, C. N.; Kuo, S. T.; So, Chun Wa; Xie, Jianyu; Lai, Kwing To; Yu, Wing Chi; Lue, C. S.; Po, Hoi Chun^*; Goh, Swee K.^*

来源：npj Quantum Materials, 2023, 8(1): 55.

DOI：10.1038/s41535-023-00588-1

• PHASE-DIAGRAM
• SURFACE

The Lifshitz-Kosevich (LK) theory is the pillar of magnetic quantum oscillations, which have been extensively applied to characterise 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 TN = 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 behaviour 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.