Interplay among spin, orbital, and lattice degrees of freedom in the magnetocaloric compound
                    <math>
                      <mrow>
                        <mi>Ho</mi>
                        <msub>
                          <mi>B</mi>
                          <mn>2</mn>
                        </msub>
                      </mrow>
                    </math>

Noriki Terada; Simon R. Larsen; Takafumi D. Yamamoto; Daisuke Okuyama; Hironori Nakao; Ginga Kitahara; Shuki Torii; Hiraku Saito; Taro Nakajima; Osamu Sakai; Hiroaki Mamiya; Kensei Terashima; Hiroyuki Takeya; Yoshihiko Takano; Hideaki Kitazawa

doi:10.1103/s3xn-xknz

Journal article Interplay among spin, orbital, and lattice degrees of freedom in the magnetocaloric compound $Ho B_{2}$

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Noriki Terada, Simon R. Larsen, Takafumi D. Yamamoto, Daisuke Okuyama, Hironori Nakao, Ginga Kitahara, Shuki Torii, Hiraku Saito, Taro Nakajima, Osamu Sakai, Hiroaki Mamiya, Kensei Terashima, Hiroyuki Takeya, Yoshihiko Takano, Hideaki Kitazawa. Interplay among spin, orbital, and lattice degrees of freedom in the magnetocaloric compound

Ho B_{2}

. Physical Review B. 2026, 113 (22), 224436. https://doi.org/10.1103/s3xn-xknz

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(abstract)

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.

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©2026 American Physical Society

Keyword: magnetocaloric material, neutron diffraction, x-ray diffraction

Date published: 2026-06-22

Publisher: American Physical Society (APS)

Journal:

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

Funding:

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

Manuscript type: Author's version (Accepted manuscript)

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

First published URL: https://doi.org/10.1103/s3xn-xknz

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Updated at: 2026-06-30 09:29:53 +0900

Published on MDR: 2026-06-30 12:27:50 +0900

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