Abstract:
An NMR analysis of 31P nuclei in metallic iron phosphide FeP has been performed both in a zero field and by sweeping the external magnetic field at several fixed frequencies with the aim of revealing and investigating the transformation of the magnetic helical structure of FeP. The NMR lineshape gradually changes with an increase in the field strength from trapezoidal (in weak fields) to pronounced asymmetric with two peaks (in strong fields). The former shape is typical of NMR spectra of powder samples under an applied magnetic field, while the latter is characteristic of NMR spectra of nonmagnetic atoms in single-crystalline helimagnetics. The observed transformation of the FeP NMR spectrum evidences in favor of the spin-reorientation transition of a spin-flop type in FeP at strong external fields.
This study was supported by Program 211 of the Government of the Russian Federation (contract no. 02.A03.21.0006), the Russian Foundation for Basic Research (project no. 17-52-80036), the Ministry of Education and Science of the Russian Federation (projects nos. 2277 and 5719), and the Interregional Program TRR80 of the German Physical Society (Munich, Augsburg).
Citation:
A. A. Gippius, S. V. Zhurenko, N. Büttgen, M. Schädler, I. Morozov, A. S. Moskvin, “NMR analysis of the magnetic structure and hyperfine interactions in a FeP binary helimagnetic”, Fizika Tverdogo Tela, 61:5 (2019), 836–840; Phys. Solid State, 61:5 (2019), 723–727
A. A. Gippius, A. V. Tkachev, S. V. Zhurenko, A. V. Mahajan, N. Büttgen, M. Schaedler, I. O. Chernyavskii, I. V. Morozov, S. Aswartham, B. Büchner, A. S. Moskvin, “NMR study of magnetic structure and hyperfine interactions in the binary helimagnet FeP”, Phys. Rev. B, 102:21 (2020)