FeSb2中应变稳定的反常磁性与电导率各向异性
Strain-stabilized altermagnetism and conductivity anisotropy in FeSb2
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中文总结 AI 辅助
研究发现FeSb2经拉伸应变可从常规反铁磁体转变为反常磁体，伴随费米面变化产生约60%的单轴电导率各向异性，该磁输运行为可作为转变的实验指标，FeSb2或可用于自旋电子器件。
中文摘要 AI 辅助
我们表明，当施加拉伸应变时，FeSb2会从常规反铁磁体转变为反常磁体。在反常磁相下，即使没有自旋轨道耦合，克拉默简并的解除也会在费米能级附近产生高达约0.2eV的自旋分裂。向反常磁相的转变伴随着费米面几何结构的显著变化，这导致单轴电导率各向异性高达约60%，远大于典型铁磁金属中观测到的数值。利用密度泛函理论和瓦尼尔插值费米面，我们表明这种磁输运行为可作为向反常磁相转变的实验指标。这些发现凸显FeSb2是一种通用的、应变可调的平台，可用于探索和利用反常磁输运现象以应用于自旋电子器件。
英文摘要
We show that FeSb2 experiences a transition from a conventional antiferromagnet to an altermagnet when tensile strain is applied. In the altermagnetic phase, the lifted Kramers degeneracy results in spin splitting up to ~0.2eV near the Fermi level even without spin-orbit coupling. The transition to the altermagnetic phase is accompanied by a dramatic change in the Fermi-surface geometry, which leads to a uniaxial conductivity anisotropy up to ~60%, much greater than those observed in typical ferromagnetic metals. Using density-functional theory and Wannier interpolated Fermi surfaces, we show that this magnetotransport behavior may function as an experimental indicator of the transition to the altermagnetic phase. These findings highlight FeSb2 as a versatile, strain-tunable platform for exploring and utilizing altermagnetic transport phenomena for spintronic devices.
