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説明:

We have investigated the magnetic orderings, crystal lattice distortion and spin dynamics in
magnetocaloric material HoB2, by using neutron diffraction, x-ray diffraction experiments and AC
susceptibility measurements. Although HoB2 exhibits the ferromagnetic phase transition at T1=15 K, the other phase transition at T2=11 K has not been elucidated so far. In the present high resolution powder neutron diffraction and single crystal x-ray diffraction experiments, we observed the crystal structure phase transition from hexagonal (P6/mmm) to monoclinic (C2/m) at T2. The structure change concomitantly occurs with change in the moment size and fixing the spin orientation angle of Ho3+ moments below T2. Analyzing the structure distortion mode coupled to spin direction, we found that the ferromagnetically ordered moments is in the hexagonal (x, -x, z)-plane. In the AC susceptibility measurements, we observed a large enhancement in the susceptibility along the ab-plane for T2 < T < T1, indicating that the ferromagnetic state in the intermediate temperature region is characterized by large spin fluctuations.

権利情報:

• In Copyright
  

  ©2026 American Physical Society

キーワード: magnetocaloric material, neutron diffraction, x-ray diffraction

刊行年月日: 2026-06-22

出版者: American Physical Society (APS)

掲載誌:

• Physical Review B (ISSN: 24699950) vol. 113 issue. 22 224436

研究助成金:

• University of Tokyo 24510
• University of Tokyo 23802
• Japan Proton Accelerator Research Complex 2025A0018
• Japan Society for the Promotion of Science 22H00297
• Japan Science and Technology Agency JPMJMI18A3
• High Energy Accelerator Research Organization 2023G510

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6377

公開URL: https://doi.org/10.1103/s3xn-xknz

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更新時刻: 2026-06-30 09:29:53 +0900

MDRでの公開時刻: 2026-06-30 12:27:50 +0900