拓扑反铁磁体YbMnBi$_2$中磁致伸缩系数量子振荡的相位校准
Phase calibration of quantum oscillations in the magnetostrictive coefficient using the topological antiferromagnet YbMnBi$_2$
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中文总结 AI 辅助
本研究以拓扑反铁磁体YbMnBi$_2$为对象，通过对比磁化与交流磁致伸缩系数的量子振荡，校准了后者的相位偏移，确立了提取贝里相位的恰当相位。
中文摘要 AI 辅助
回旋轨道积累的贝里相位编码了电子能带拓扑的重要信息，通常可从量子振荡的相位中推断得到。交流磁致伸缩系数的测量近期已成为一种灵敏的量子振荡热力学探测手段，但其相位偏移尚未得到实验校准。本研究使用拓扑反铁磁体YbMnBi$_2$，通过直接对比磁化强度与交流磁致伸缩系数中的量子振荡来校准该相位偏移。对同一块单晶的两种响应测量显示，在高达14 T的磁场下存在约160 T的单一基频，可实现不受多频率歧义影响的直接相位对比。我们观测到两种振荡响应间存在约π/2的相对相移，这与将磁致伸缩系数与磁化强度应力导数关联的麦克斯韦关系一致。本研究结果确立了从交流磁致伸缩系数的量子振荡中提取回旋轨道相位信息所需的恰当相位。
英文摘要
The Berry phase accumulated along a cyclotron orbit encodes important information about electronic band topology and is commonly inferred from the phase of quantum oscillations. Measurements of the ac magnetostrictive coefficient have recently emerged as a sensitive thermodynamic probe of quantum oscillations, but the phase offset has not been experimentally calibrated. Here, using the topological antiferromagnet YbMnBi$_2$, we calibrate this offset by directly comparing quantum oscillations in magnetization with those in the ac magnetostrictive coefficient. Measurements of both responses on the same single crystal reveal a single fundamental frequency of approximately 160 T in fields up to 14 T, enabling a direct phase comparison free from ambiguities associated with multiple frequencies. We observe an approximately $π/2$ relative phase shift between the two oscillatory responses, consistent with the Maxwell relation linking the magnetostrictive coefficient to the stress derivative of magnetization. Our results establish the appropriate phase needed to extract cyclotron-orbit phase information from quantum oscillations in the ac magnetostrictive coefficient.
