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説明:

The successful growth of single crystals of a cubic Laves-phase material HoAl2 with the space group Fd-3m is reported. The crystals were grown by a floating-zone method with five laser di-odes as a heat source. Al-rich feed rods were prepared for compensation of heavy evaporation during the growth. The nominal ratio for the feed rods was optimized as Ho : Al = 1 : 2.5. Single crystals of HoAl2 with a length of 50 mm were firstly grown in this technique. Obtaining the large-size crystal by the floating-zone method enabled us to systematically explore the physical properties using the same batch crystal. The crystal possessed a second-ordered ferromagnetic transition at 29 K and a first-ordered spin-reorientation transition at 20 K. The bulk physical properties such as specific heat, magnetic susceptibility, isothermal magnetization, and thermal expansion measurements were measured. Also, a magnetocaloric effect was evaluated by the magnetic entropy change. We systematically demonstrate that anisotropic physical properties along the principal axes ([100], [110], and [111]) emerged below the magnetically ordered states, in contrast to the isotropic behavior in the paramagnetic state.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: HoAl2, crystal growth, laser floating-zone technique, bulk physical properties, magnetocaloric effect

刊行年月日: 2023-05-03

出版者: MDPI AG

掲載誌:

• Crystals (ISSN: 20734352) vol. 13 issue. 5 p. 760-760

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.3390/cryst13050760

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更新時刻: 2024-01-26 08:59:47 +0900

MDRでの公開時刻: 2024-01-26 12:30:21 +0900