Magnetic-ordering propagation vectors of terbium hexaboride revisited

Iwasa, Kazuaki*; Iga, Fumitoshi*; Moyoshi, Taketo*; Nakao, Akiko*; Ohara, Takashi

The magnetic-ordered state of a single-crystal sample of TbB $_{6}$ 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 $q_{rm M2}$ = (1/4, 1/4, 0) below the Nel temperature $T_{rm N}$ 20 K, in addition to the $q_{rm M1}$ = (1/4, 1/4. 1/2) reported in the previous literatures. Because X-ray Thomson scattering measurements do not detect the $q_{rm M2}$ superlattice reflections at 13 K, $q_{rm M2}$ is a new magnetic-ordering propagation vector. The magnetic multi-q structure of TbB $_{6}$ is similar to that of CeB $_{6}$ , whereas the ratio of the $q_{rm M2}$ amplitude to that of qM1 is smaller than in CeB $_{6}$ . The combination of $q_{rm M1}$ and $q_{rm M2}$ is expected to assist the $q_{rm L1}$ = (1/2, 0, 0) lattice modulation.

Language	:	English
Journal	:	Journal of the Physical Society of Japan
Volume	:	87
Number	:	6
Pages	:	p.064705_1 - 064705_5
Publication Year/Month	:	2018/06
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Paper URL	:	https://doi.org/10.7566/JPSJ.87.064705
DOI for research data	:	Link to research data related to this paper/report.
Keywords	:	6ホウ化テルビウム; 単結晶中性子散乱; SENJU
Research Facility	:	J-PARC物質・生命科学実験施設
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Article of JAEA R&D Review	:
Cooperating Institute	:	茨城大学; 総合科学研究機構

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Registration No. : AA20180012
JAEA Abstracts No. : 46000594
Paper Submission No. : 20186

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