NMR研究双螺旋磁网络FeP的磁结构和超精细相互作用
NMR study of magnetic structure and hyperfine interactions in binary helimagnet FeP
摘要：
本文用${}^{31}$ P核磁共振谱对单磷化物FeP的基态螺旋磁结构进行了详细的研究。我们发现，零场NMR谱的多晶样品提供了强有力的证据，局部磁场的各向异性分布在P网站的非谐性大大低于发现在Fe网站的穆斯堡尔谱。从场扫描${}^{31}$ P NMR谱我们得出结论，一个连续的自旋重取向转变发生在外部磁场范围为4 - 7 T，这也证实了比热测量。我们观察到两对磁性不等价的磷的位置，导致在一个明显的四峰结构的单晶${}^{31}$ P NMR谱特征的一个不相称helmagnetic基态。我们揭示了在高场下由Fe自旋-重取向转变引起的P位局域场的空间重新分布，并提出了一种有效的方法来解释它。我们证明，所有观测到的${}^{31}$ P谱都可以在Fe磁矩的各向同性螺旋模型中处理。根据中子散射数据，在Fe 1-Fe 3（Fe 2-Fe 4）和Fe 1-Fe 2（Fe 3-Fe 4）位点之间分别具有36 $^{\circ}$和176 $^{\circ}$的相移的（$ab$）-平面。
英文摘要：
We report a detailed study of the ground state helical magnetic structure in monophosphide FeP by means of ${}^{31}$P NMR spectroscopy. We show that the zero-field NMR spectrum of the polycrystalline sample provides strong evidence of an anisotropic distribution of local magnetic fields at the P site with substantially lower anharmonicity than that found at the Fe site by Mössbauer spectroscopy. From field-sweep ${}^{31}$P NMR spectra we conclude that a continuous spin-reorientation transition occurs in an external magnetic field range of 4 - 7 T, which is also confirmed by specific-heat measurements. We observe two pairs of magnetically inequivalent phosphorus positions resulting in a pronounced four-peak structure of the single crystal ${}^{31}$P NMR spectra characteristic of an incommensurate helimagnetic ground state. We revealed a spatial redistribution of local fields at the P sites caused by Fe spin-reorientation transition in high fields and developed an effective approach to account for it. We demonstrate that all observed ${}^{31}$P spectra can be treated within a model of an isotropic helix of Fe magnetic moments in the ($ab$)-plane with a phase shift of 36$^{\circ}$ and 176$^{\circ}$ between Fe1-Fe3 (Fe2-Fe4) and Fe1-Fe2 (Fe3-Fe4) sites, respectively, in accordance with the neutron scattering data.
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