金属Helimagnet MnP中的新型手征结构和反常的温度滞后
Novel Magnetic Chiral Structures and Unusual Temperature Hysteresis in the Metallic Helimagnet MnP
摘要：
我们重新研究了经典的金属helimagnet MnP的磁化和中子散射实验的磁性。我们的中子散射结果表明，以前报道的低温螺旋磁相（T <47 K）的磁结构应该修改为由Dzyaloshinsky-Moriya相互作用产生的交替倾斜螺旋磁结构。在c轴上的LT螺旋磁相和高温铁磁相之间的中间温度（47 K < T <282 K）范围内，发现了沿b轴的弱铁磁行为。令人惊讶的是，IT弱铁磁相具有两种不同的状态，即大磁化（LM）和小磁化（SM）状态。SM状态出现与冷却从顺磁相以上292 K通过HT铁磁相和LM状态出现与升温从LT helmagnetic相。沿b轴的弱铁磁性和不寻常的温度滞后在IT相可以理解，通过假设一个自发形成的条纹结构交替排列的HT铁磁和LT helmagnetic域组成。
英文摘要：
We have reinvestigated the magnetic properties of the classical metallic helimagnet MnP by magnetization and neutron scattering experiments. Our neutron scattering results indicate that the previously reported magnetic structure in the low-temperature (LT) helimagnetic phase (T < 47K) should be modified to an alternately tilted helimagnetic structure pro- duced by the Dzyaloshinsky-Moriya interaction. In the intermediate temperature (IT) range between the LT helimagnetic phase and the high-temperature (HT) ferromagnetic phase along the c-axis, 47K < T < 282K, we have found a weak ferromagnetic behavior along the b-axis. Surprisingly, the IT weak ferromagnetic phase has two different states, namely, the large magnetization (LM) and small magnetization (SM) states. The SM state emerges with cooling from the paramagnetic phase above 292 K via the HT ferromagnetic phase and LM state emerges with warming from the LT helimagnetic phase. The weak ferromagnetism along the b-axis and the unusual temperature hysteresis in the IT phase can be understood by assuming a spontaneous formation of the stripe structure consisting of alternately arranged HT ferromagnetic and LT helimagnetic domains.
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