Magnetic-ordering propagation vectors of terbium hexaboride revisited

岩佐 和晃*; 伊賀 文俊*; 茂吉 武人*; 中尾 朗子*; 大原 高志

Journal of the Physical Society of Japan, 87(6), p.064705_1 - 064705_5, 2018/06

https://doi.org/10.7566/JPSJ.87.064705

The magnetic-ordered state of a single-crystal sample of TbB has been studied with the high-precision neutron diffraction instrument SENJU installed at BL18 of the Materials and Life Science Facility in J-PARC. We observed new Bragg-reflection spots characterized by a propagation vector = (1/4, 1/4, 0) below the Nel temperature 20 K, in addition to the = (1/4, 1/4. 1/2) reported in the previous literatures. Because X-ray Thomson scattering measurements do not detect the superlattice reflections at 13 K, is a new magnetic-ordering propagation vector. The magnetic multi-q structure of TbB is similar to that of CeB, whereas the ratio of the amplitude to that of qM1 is smaller than in CeB. The combination of and is expected to assist the = (1/2, 0, 0) lattice modulation.