科研之友
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摘要
We report NMR studies of TbCoGa5, which has the tetragonal HoCoGa5 structure and exhibits two antiferromagnetic (AF) transitions at T-N1 = 36.2 K and T-N2 = 5.4 K. From a symmetry analysis of internal magnetic fields at orthorhombic Ga sites, we have successfully determined the magnetic structures in the AF-I (T-N2 < T < T-N1) and AF-II (T < T-N2) phases. The AF-I phase is a collinear AF order with a propagation vector q = [1/2,0,1/2] and ordered moments parallel to the [001] direction. In the AF-II phase, on the other hand, we found a noncollinear AF structure described by double propagation vectors q(1) = [1/2,0,1/2] and q(2) = [0,1/2,1/2], where the moments tilt away from the [001] direction toward [100], keeping a constant value along the [001] direction. In the context of these results, we discuss the possible presence of magnetic frustration in this system.
- 出版日期2011-12-2
