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Unlocking the secrets of quasicrystal magnetism: Revealing a novel magnetic phase diagram

January 18, 2024
Tokyo University of Science
Non-Heisenberg-type approximant crystals have many interesting properties and are intriguing for researchers of condensed matter physics. However, their magnetic phase diagrams, which are crucial for realizing their potential, remain completely unknown. Now, a team of researchers has constructed the magnetic phase diagram of a non-Heisenberg Tsai-type 1/1 gold-gallium-terbium approximant crystal. This development marks a significant step forward for quasicrystal research and for the realization of magnetic refrigerators and spintronic devices.

Quasicrystals are intermetallic materials that have garnered significant attention from researchers aiming to advance condensed matter physics understanding. Unlike normal crystals, in which atoms are arranged in an ordered repeating pattern, quasicrystals have non-repeating ordered patterns of atoms. Their unique structure leads to many exotic and interesting properties, which are particularly useful for practical applications in spintronics and magnetic refrigeration.

A unique quasicrystal variant, known as the Tsai-type icosahedral quasicrystal (iQC) and their cubic approximant crystals (ACs), display intriguing characteristics. These include long-range ferromagnetic (FM) and anti-ferromagnetic (AFM) orders, as well as unconventional quantum critical phenomenon, to name a few. Through precise compositional adjustments, these materials can also exhibit intriguing features like aging, memory, and rejuvenation, making them suitable for the development of next-generation magnetic storage devices. Despite their potential, however, the magnetic phase diagram of these materials remains largely unexplored.

To uncover more, a team of researchers, led by Professor Ryuji Tamura from the Department of Materials Science and Technology at Tokyo University of Science (TUS) in collaboration with researchers fromTohoku University recently conducted magnetization and powder neutron diffraction (PND) experiments on the non-Heisenberg Tsai-type 1/1 gold-gallium-terbium AC.

"For the first time, the phase diagrams of the non-Heisenberg Tsai-type AC have been unravelled. This will boost applied physics research on magnetic refrigeration and spintronics," remarks Professor Tamura.

Through several experiments, the researchers developed the first comprehensive magnetic phase diagram of the non-Heisenberg Tsai-type AC, covering a broad range of electron-per-atom (e/a) ratios (a parameter crucial for understanding the fundamental nature of QCs). Additionally, measurements using the powder neutron diffraction (PND) revealed the presence of a noncoplanar whirling AFM order at an e/a ratio of 1.72 and a noncoplanar whirling FM order at the e/a ratio of 1.80. The team further elucidated the ferromagnetic and anti-ferromagnetic phase selection rule of magnetic interactions by analyzing the relative orientation of magnetic moments between nearest-neighbour and next-nearest neighbour sites.

Professor Tamura adds that their findings open up new doors for the future of condensed matter physics. "These results offer important insights into the intricate interplay between magnetic interactions in non-Heisenberg Tsai-type ACs. They lay the foundation for understanding the intriguing properties of not only non-Heisenberg ACs but also non-Heisenberg iQCs that are yet to be discovered."

In summary, the present breakthrough propels condensed matter physics and quasicrystal research into uncharted territories, paving the way for advanced electronic devices and next-generation refrigeration technologies.

Story Source:

Materials provided by Tokyo University of Science. Note: Content may be edited for style and length.

Journal Reference:

  1. Farid Labib, Kazuhiro Nawa, Shintaro Suzuki, Hung-Cheng Wu, Asuka Ishikawa, Kazuki Inagaki, Takenori Fujii, Katsuki Kinjo, Taku J. Sato, Ryuji Tamura. Unveiling exotic magnetic phase diagram of a non-Heisenberg quasicrystal approximant. Materials Today Physics, 2024; 40: 101321 DOI: 10.1016/j.mtphys.2023.101321

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Tokyo University of Science. "Unlocking the secrets of quasicrystal magnetism: Revealing a novel magnetic phase diagram." ScienceDaily. ScienceDaily, 18 January 2024. <>.
Tokyo University of Science. (2024, January 18). Unlocking the secrets of quasicrystal magnetism: Revealing a novel magnetic phase diagram. ScienceDaily. Retrieved February 25, 2024 from
Tokyo University of Science. "Unlocking the secrets of quasicrystal magnetism: Revealing a novel magnetic phase diagram." ScienceDaily. (accessed February 25, 2024).

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