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J-Material Strongly Correlated Electron Physics Lab
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The lab investigates the mechanisms of superconductivity and magnetism produced by electrons, through experiments at extremely low temperatures and in high magnetic fields.
AboutAbout the lab
Exploring new material functions generated by spin and orbitals
The J-Material Strongly Correlated Electron Physics Lab experimentally studies properties of electrons in solids, such as superconductivity and magnetism.
The lab develops new functions brought about by spin-orbit interaction and the breaking of crystal symmetry, as well as materials that have these functions, which it calls “J-Materials.”
It measures thermal, magnetic, electrical, and ultrasonic properties at extremely low temperatures, in high magnetic fields, and under ultrahigh pressure, and combines these with microscopic experiments such as neutron scattering and X-ray measurements.
The lab also conducts research on order and fluctuations using X-ray diffraction and laser spectroscopy, and on phenomena that appear in light-excited states.
Key terms
- Spin-orbit interaction
- An effect in which the spin of an electron, which corresponds to its rotation, couples with its orbital motion around the atomic nucleus.
- Charge density wave
- A state in which the electron density in a crystal forms periodic light and dark variations, like a wave.
- Antiferromagnetism
- Magnetism in which the magnetic moments of neighboring atoms align in alternating directions. Overall, they cancel each other's magnetization.
- Magnetostriction
- A phenomenon in which a material slightly expands or contracts when a magnetic field is applied.
NewsLab news
Paper on “negative magnetization” in TbNiC2 published in JPS Hot Topics
Master's student received an Excellent Poster Award at the plenary meeting of the Transformative Research Area “Asymmetric Quantum”
Master's student received an Excellent Poster Award at the results report meeting of the Transformative Research Area “Asymmetric Quantum”
Paper on the phenomenon of synthetic diamond becoming softer at extremely low temperatures published in J. Phys. Soc. Jpn. (press release)
Paper on the anisotropic magnetic field–temperature phase diagram of CeCoSi published in J. Phys. Soc. Jpn.
ResearchResearch themes
The lab calls the new material functions brought about by spin-orbit interaction and the breaking of crystal parity symmetry “J-Materials,” and works on developing them. Through precise measurements of physical properties in extreme environments and microscopic experiments, it investigates phenomena such as superconductivity, magnetic correlations, and magnetoelectric cross-correlation.
*Illustrative image“Negative Magnetization” Found in TbNiC2
The lab discovered “negative magnetization” in TbNiC2: when the material is cooled in a weak magnetic field, spontaneous magnetization appears in the direction opposite to the field. The lab reports that the cause may be the alignment of the phases of the antiferromagnetic order and the charge density wave.
*Illustrative imageCurrent-Induced Magnetization in UNi4B
The lab studies UNi4B, an antiferromagnet in which this research group was the first to observe, in a metal, the phenomenon of magnetization generated by passing a current. A puzzle remains: magnetization also appears in a direction different from the theoretical prediction, and revisiting the magnetic structure is an open task.
*Illustrative imageSixfold Symmetry in the Phase Diagram of UNi4B
Based on the correct orthorhombic crystal axes, the lab measured the thermal expansion and magnetostriction of UNi4B while varying the angle of the magnetic field. It has shown that the magnetic field–temperature phase diagram has sixfold rotational symmetry in the plane.
*Illustrative imageThe “Hidden Order” in CeCoSi
The lab investigates the “hidden order” of unknown origin in CeCoSi by looking at how the phase diagram differs depending on the direction of the magnetic field. It found that a new phase appears only when the field is applied along a particular crystal axis, and, in collaboration with theorists, proposed the symmetry of the order.
MembersFaculty
The J-Material Strongly Correlated Electron Physics Lab consists of faculty members and students in the doctoral, master's, and undergraduate programs.As of 2026
- ProfessorHiroshi Amitsuka
- ProfessorTatsuya Yanagisawa
- Associate ProfessorMasaki Takesada
- Assistant ProfessorHiroyuki Hidaka
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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: “Liquid helium dewars” Adville / CC BY-SA 4.0 (cropped)
- “Negative Magnetization” Found in TbNiC2: “Handheld compass with a magnetic needle” Sneha G Gupta / CC BY-SA 4.0 (cropped)
- Current-Induced Magnetization in UNi4B: “Straight-wire-magnetic-field-compass-needles” MikeRun / CC BY-SA 4.0 (cropped)
- Sixfold Symmetry in the Phase Diagram of UNi4B: “Steel sample in dilatometer holder” MadCAD / CC BY-SA 4.0 (cropped)
- The “Hidden Order” in CeCoSi: “Cerium (Element - 58) 1” James St. John / CC BY 2.0 (cropped)
- Related lab (量子物性物理学研究室): “Thin section scan crossed polarizers Siilinjärvi R edit” kallerna / CC BY-SA 4.0 (cropped)
- Related lab (固体電子物性研究室): “YBCO-xtal-3D-SF” Ben Mills / Public domain (cropped)
- Related lab (素粒子・宇宙論研究室): “Cosmic Microwave Background (CMB)” ESA and the Planck Collaboration / CC BY 4.0 (cropped)
- Related lab (原子核理論研究室): “REX-ISOLDE” Maximilien Brice / CC BY 4.0 (cropped)
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