Chemical tuning of magnetic anisotropy and correlations in Ni1-xFexPS3

초록

We report the temperature and composition dependence of static magnetic susceptibility and Raman spectroscopic measurements on van der Waals antiferromagnets Ni1-xFexPS3. The end members NiPS3 and FePS3 feature XY- and Ising-like magnetism, respectively, enabling chemical tuning of magnetic anisotropy and spin correlations. Ni1-xFexPS3 shows a turnover from the XY to Ising anisotropy through x≈0.1. Although the XY anisotropy is rapidly suppressed on introducing Fe content, two-magnon scattering evidences the slow repression of short-range magnetic correlations deep inside the Fe-rich side. Counterintuitively, the two-magnon signal undergoes less renormalization of its energy with increasing x despite the larger spin number and enhanced classical magnetism. The disparate static and dynamic magnetic behaviors indicate the emergence of an exotic spin state in alloy van der Waals magnets. © 2021 American Physical Society.

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