Magnetic structure of triangular lattice compound Tb2Ni0.90Si2.94

[摘要] AlB2-type ternary intermetallic compound Tb2Ni0.90Si2.94 (space group P6/mmm,hP3, No. 191) was reported to exhibit spin freezing behaviour of the ferromagnetic clusters present in the system below Tf = 9.9 K, along with the presence of spatially limited antiferromagnetic phase. In this work, on the basis of variable temperature zerofield neutron diffraction measurements, we have shown that the antiferromagnetic phase transition occurs for the compound below TN similar to 13 K. Neutron diffraction study indicates ab-plane non-collinear sine-modulated antiferromagnetic ordering of the system with wave vectors of k1 = [+/- 1/6, +/- 1/6, 0] and k2 = [+/- 1/3, +/- 1/3, 0] down to 1.7 K. The weak and diffuse nature of the magnetic Bragg peaks along with limited coherence length further confirm the short-range nature of the antiferromagnetic phase in this compound.

[发布日期] 2021-10-15

[关键词] Intermetallics;Rare-earths;Magnetic structure;Neutron diffraction