论文标题
Weyl Semimetal CO3SN2S2的铁磁阶段内磁性域壁的异常繁殖
Anomalous depinning of magnetic domain walls within the ferromagnetic phase of the Weyl semimetal Co3Sn2S2
论文作者
论文摘要
我们报告了CO3SN2S2单晶中磁性域的批量磁化测量和空间分辨的测量。结果表明，先前报道的磁异常约为130 K，这是由于冷却时的异常域壁引起的。我们的测量值还揭示了在300 OE以下的恒定磁场下获得的场冷却冷却（FCC）和场冷热（FCW）磁化曲线之间的磁滞。该观察结果排除了异常源于二阶过渡的可能性。我们的结果进一步表明，磁滞回路的形状从5 K到170 K的变化是由一个不寻常的温度依赖性域成核场引起的，该域核定场在130 K附近发生了变化。
We report bulk magnetization measurements and spatially resolved measurements of magnetic domains in Co3Sn2S2 single crystals. The results indicate that a previously reported magnetic anomaly around 130 K is due to an anomalous domain wall depinning upon cooling. Our measurements also reveal a hysteresis between field-cooled-cooling (FCC) and field-cooled-warming (FCW) magnetization curves acquired under a constant magnetic field below 300 Oe. This observation rules out the possibility that the anomaly stems from a second-order phase transition. Our results further suggest that changes in the shape of hysteresis loops from 5 K to 170 K are caused by an unusual temperature-dependent domain nucleation field that changes sign around 130 K. The Kerr rotation images of the magnetic domains confirm that the domain walls depin between 120 K and 140 K.
