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Magnetic Physics Lab
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A lab that studies valence changes in compounds of europium and other elements.
AboutAbout the lab
Exploring unusual phenomena in magnetic materials and working to clarify how they arise.
The Magnetic Physics Lab searches for unusual physical phenomena that appear in magnetic materials and conducts research to clarify their mechanisms.
In compounds containing europium (Eu) or ytterbium (Yb), the lab studies phenomena in which the "valence" of the ions switches between 2+ and 3+, or the ions line up in a fixed pattern.
The lab captures these behaviors by examining changes under applied pressure and through diffraction experiments using X-rays and neutrons.
The lab belongs to the Quantum Condensed Matter field, Condensed Matter Physics chair, Department of Physics, Faculty of Science, Graduate School, Kyushu University.
Key terms
- Valence transition
- A phenomenon in which ions such as Eu switch to a different valence state, for example between 2+ and 3+.
- Valence fluctuation
- A state in which the valence fluctuates in time and space between values such as 2+ and 3+.
- Valence order
- A state in which ions of different valences, such as 2+ and 3+, are arranged in a fixed pattern in a crystal.
ResearchResearch themes
The Magnetic Physics Lab searches for unusual physical phenomena that appear in magnetic materials and aims to clarify their mechanisms. Its main research subjects are the valence transitions and valence order seen in compounds containing Eu or Yb.
*Illustrative imageValence Transitions in Europium Compounds
In compounds, europium (Eu) takes either a 2+ state with seven 4f electrons or a 3+ state with six. The lab found that applying pressure to the antiferromagnet EuRh2Si2 makes the antiferromagnetic order disappear and a valence transition appear.
*Illustrative imageValence Order in Ytterbium Compounds
YbPd is a valence-fluctuating material in which the average valence of Yb is 2.8+. Using single-crystal X-ray diffraction, the lab showed that valence order occurs in it. Valence order usually occurs in materials that conduct electricity poorly, so seeing it in a metallic material is unusual. The lab also examined the magnetic structure using neutron diffraction.
*Illustrative imageTwo-Step Valence Order in EuPtP
In the layered hexagonal compound EuPtP, the lab used resonant X-ray diffraction at SPring-8 to find two valence-ordered structures with different stacking patterns of 2+ and 3+ layers. Applying pressure produces a new valence structure, and at even higher pressure both the valence order and the magnetic order disappear.
MembersFaculty
The members of the Magnetic Physics Lab consist of faculty and students in the master's and undergraduate programs.As of 2026
- Associate ProfessorAkihiro Mitsuda
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Eu2O3.powder” Materialscientist at en.wiki / CC BY-SA 3.0 (cropped)
- Valence Transitions in Europium Compounds: “Europium (III) Hydroxide under UV light” Zlynkyx/Leo S / CC BY-SA 4.0 (cropped)
- Valence Order in Ytterbium Compounds: “Ytterbium-3” Jurii / CC BY 3.0 (cropped)
- Two-Step Valence Order in EuPtP: “Gold-crystals” Alchemist-hp (talk) www.pse-mendelejew.de / CC BY-SA 3.0 de (cropped)
- Related lab (創発量子物性研究室): “Two-pronged Approach to Studying High-temperature Superconductivity ( )” National Science Foundation / Public domain (cropped)
- Related lab (凝縮系理論研究室): “Researchers advance topological superconductors for quantum computing ( )” Oak Ridge National Laboratory / CC BY 2.0 (cropped)
- Related lab (物性理論研究室): “Growing crystals in liquid glass” AgrisR / CC BY-SA 4.0 (cropped)
- Related lab (固体電子物性研究室): “Eddy-currents in spinning disc” Silvanus Phillips Thompson / CC0 (cropped)
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