Magnetic-Ordering Propagation Vectors of Terbium Hexaboride Revisited

The magnetic ordered state of a single-crystal sample of TbB6 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 qM2=(1/4,1/...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2018-06, Vol.87 (6), p.64705
Main Authors: Iwasa, Kazuaki, Iga, Fumitoshi, Moyoshi, Taketo, Nakao, Akiko, Ohhara, Takashi
Format: Article
Language:English
Subjects:
Crystal lattices
Diffraction
Magnetic fields
Neutron diffraction
Propagation
Scattering
Single crystals
Superlattices
Terbium
Thomson scattering
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Summary:The magnetic ordered state of a single-crystal sample of TbB6 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 qM2=(1/4,1/4,0) below the Néel temperature TN ≈ 20 K, in addition to qM1=(1/4,1/4,1/2) reported in the literature. Because X-ray Thomson scattering measurements do not detect the qM2 superlattice reflections at 13 K, qM2 is a new magnetic-ordering propagation vector. The magnetic multi-q structure of TbB6 is similar to that of CeB6, whereas the ratio of the qM2 amplitude to that of qM1 is smaller than that in CeB6. The combination of qM1 and qM2 is expected to assist the qL1=(1/2,0,0) lattice modulation.
ISSN:0031-9015
1347-4073
DOI:10.7566/JPSJ.87.064705