Khasanov R, Amato A, Bonfà P, Guguchia Z, Luetkens H, Morenzoni E, De Renzi R, Zhigadlo N D
Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland.
J Phys Condens Matter. 2017 Apr 26;29(16):164003. doi: 10.1088/1361-648X/aa6391. Epub 2017 Mar 21.
Muon-spin rotation data collected at ambient pressure (p) and at p = 2.42 GPa in MnP were analyzed to check their consistency with various low- and high-pressure magnetic structures reported in the literature. Our analysis confirms that in MnP the low-temperature and low-pressure helimagnetic phase is characterised by an increased value of the average magnetic moment compared to the high-temperature ferromagnetic phase. An elliptical double-helical structure with a propagation vector [Formula: see text], an a-axis moment elongated by approximately 18% and an additional tilt of the rotation plane towards c-direction by [Formula: see text]-8° leads to a good agreement between the theory and the experiment. The analysis of the high-pressure μSR data reveals that the new magnetic order appearing for pressures exceeding 1.5 GPa can not be described by keeping the propagation vector [Formula: see text]. Even the extreme case-decoupling the double-helical structure into four individual helices-remains inconsistent with the experiment. It is shown that the high-pressure magnetic phase which is a precursor of superconductivity is an incommensurate helical state with [Formula: see text].
分析了在常压（p）和p = 2.42 GPa下在MnP中收集的μ子自旋旋转数据，以检查它们与文献中报道的各种低压和高压磁性结构的一致性。我们的分析证实，在MnP中，低温和低压螺旋磁相的特征是与高温铁磁相相比平均磁矩值增加。具有传播矢量[公式：见正文]的椭圆形双螺旋结构、a轴矩拉长约18%以及旋转平面朝着c方向额外倾斜[公式：见正文]-8°，使得理论与实验之间达成了良好的一致性。对高压μSR数据的分析表明，对于超过1.5 GPa的压力出现的新磁序不能通过保持传播矢量[公式：见正文]来描述。即使是将双螺旋结构解耦为四个单独螺旋的极端情况，也与实验不一致。结果表明，作为超导前驱体的高压磁相是一种具有[公式：见正文]的非公度螺旋态。
