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arXiv · 2008.10975

NMR study of magnetic structure and hyperfine interactions in binary helimagnet FeP

A. A. Gippius·A. V. Tkachev·S. V. Zhurenko·N. Büttgen·M. Schädler·I. O. Chernyavskii·I. V. Morozov·S. Aswartham·B. Büchner·A. S. Moskvin
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Abstract

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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A. A. Gippius, A. V. Tkachev, S. V. Zhurenko, N. Büttgen, M. Schädler, I. O. Chernyavskii, I. V. Morozov, S. Aswartham, B. Büchner, A. S. Moskvin. 2020-11-06. NMR study of magnetic structure and hyperfine interactions in binary helimagnet FeP. https://doi.org/10.1103/physrevb.102.214416

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