Journal
PHYSICAL REVIEW MATERIALS
Volume 5, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevMaterials.5.073401
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [DFG A.S 523/4-1, SFB 1143, 247310070]
- Wurzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter-ct.qmat [EXC 2147, 390858490]
- [STU 695/1-1]
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In this study, crystal growth and magnetic characterization of (Fe1-xNix)(2)P2S6 were conducted, revealing an abrupt change in anisotropy at a critical Ni concentration and anisotropic magnetization in the range of 0 < x <= 0.9.
We report the crystal growth by chemical vapor transport together with a thorough structural and magnetic characterization of the quasi-2D magnets (Fe1-xNix)(2)P2S6 with x(Ni) = 0, 0.3, 0.5, 0.7, 0.9, and 1. As-grown crystals exhibit a layered morphology with weak van der Waals interactions between layers parallel to the crystallographic ab plane of the monoclinic structure in the space group C2/m (No. 12). Magnetization measurements reveal an antiferromagnetic ground state for all grown crystals. In the ordered state, the magnetization along different crystallographic directions is in agreement with an Ising anisotropy for 0 <= x <= 0.9 and only for Ni2P2S6 a different behavior is observed which is in line with an anisotropic Heisenberg or XXZ model description. This striking abrupt change of anisotropy at a critical Ni concentration is coupled to a change in the width of the maximum in the magnetization around T-max. Furthermore, all intermediate compounds 0 < x <= 0.9 exhibit an anisotropic magnetization already in the paramagnetic state similar to the parent compound Fe2P2S6.
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