MnP极低场的异常相位
Anomalous phase of MnP at very low field
摘要：
磷化锰MnP由于其丰富的磁相图而被研究了几十年。MnP在$\Tc=292$ K附近表现出铁磁相变，在低于$\TN=47$ K的温度下表现出螺旋磁相。最近，在磁场低于5 Oe时，在$T^* = 282$ K下观察到了一种新的磁相变，但新相变的性质尚未得到阐明。为了揭示这一点，我们进行了交流和直流磁化测量的单晶锰氧化物在很低的磁场。在$T^*$处观察到交流磁化率实部和虚部的发散行为以及直流磁化强度的急剧增加，表明在$T^*$处发生了磁相变。此外，还观察到一种特殊的温度滞后现象：即磁化强度取决于测量前是否将样品冷却到低于$\TN$的温度。这种磁滞现象表明了新相的复杂性质，以及新相的磁状态与螺旋结构之间的强烈关系。
英文摘要：
Manganese phosphide MnP has been investigated for decades because of its rich magnetic phase diagram. It is well known that the MnP exhibits the ferromagnetic phase transition at $\Tc=292$ K and the helical magnetic phase below $\TN=47$ K at zero field. Recently, a novel magnetic phase transition was observed at $T^* = 282$ K when the magnetic field is lower than 5 Oe. However, the nature of the new phase has not been illuminated yet. In order to reveal it, we performed the AC and the DC magnetization measurements for a single crystal MnP at very low field. A divergent behavior of the real and the imaginary part of the AC susceptibility and a sharp increase of the DC magnetization was observed at $T^*$, indicating the magnetic phase transition at $T^*$. Furthermore a peculiar temperature hysteresis was observed: namely, the magnetization depends on whether cooling sample to the temperature lower than $\TN$ or not before the measurements. This hysteresis phenomenon suggests the complicated nature of the new phase and a strong relation between the magnetic state of the new phase and the helical structure.
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