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Matsubayashi Lab
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A lab that explores new electronic phenomena in extreme environments such as high pressure.
AboutAbout the lab
Exploring new electronic phenomena in extreme environments.
The Matsubayashi Lab experimentally investigates new phenomena shown by electrons in materials, in environments that combine high pressure, ultralow temperature, and high magnetic fields.
In a material, many electrons crowd together, and a variety of cooperative phenomena arise from the electrons' charge, magnetic, and orbital degrees of freedom.
The lab studies the behavior of electrons under high pressure in systems such as excitonic insulators, heavy-fermion superconductors, and quantum critical phenomena.
Lab visits are accepted at any time.
Key terms
- Excitonic insulator
- A material in a state where excitons, bound pairs of an electron and a hole, have condensed.
- Heavy-fermion superconductivity
- Superconductivity that appears in materials known as heavy-fermion systems.
- Quantum critical phenomena
- Phenomena observed near the point where order such as magnetism appears or disappears under pressure.
NewsLab news
Master's student wins the Meguro-kai Award at the master's thesis presentation
Undergraduate student wins the Excellent Presentation Award and the Meguro-kai Award at the senior thesis presentation
Master's student wins a Student Poster Award at AIRAPT-29, an international high-pressure conference
Undergraduate student wins the Excellent Presentation Award at the senior thesis presentation
At the senior thesis and master's thesis presentations, an undergraduate student wins the Meguro-kai Award and a master's student wins the Excellent Presentation Award
ResearchResearch themes
In materials where many electrons crowd together, a variety of cooperative phenomena arise from the charge, magnetic, and orbital degrees of freedom. This lab searches for new phenomena in electron systems in environments that combine high pressure of around 100,000 atmospheres with ultralow temperature and high magnetic fields, and aims to clarify their origins. The research descriptions on the lab's website date from around 2021.
*Illustrative imagePressure Effects and Superconductivity in an Excitonic Insulator
The lab experimentally determined, for the first time, the pressure-temperature phase diagram of the layered material Ta2NiSe5, which has been suggested to be an excitonic insulator, up to around 100,000 atmospheres. It discovered superconductivity near the pressure at which the partial gap in the high-pressure semimetal phase disappears.
*Illustrative imageOrbital Degrees of Freedom and Heavy-Fermion Superconductivity
PrTi2Al20 has a nonmagnetic ground state with only an orbital degree of freedom, which makes it well suited to studying the relationship between quadrupole (orbital) order and superconductivity. The lab discovered that heavy-fermion superconductivity appears near the pressure at which strong quadrupole order is suppressed.
Valence Instability and Quantum Critical Phenomena
In the rare-earth intermetallic compound YbNi3Ga9, the lab observed a sharp increase in magnetization near the pressure where pressure-induced magnetic order appears, linked to a valence crossover and quantum critical phenomena of valence fluctuations. This is expected to provide an important guide for clarifying the origin of a new kind of quantum critical phenomenon.
*Illustrative imageTemperature-Pressure Phase Diagrams Under High-Quality High Pressure
Experimental results can differ depending on the quality of the high pressure, that is, on non-hydrostatic pressure effects. The lab investigated the electronic phase diagrams of a parent compound of iron-based superconductors and of a topological insulator under high-quality high-pressure conditions, and clarified how non-hydrostatic pressure effects influence their physical properties.
MembersFaculty
The members of the Matsubayashi Lab are faculty members and master's and undergraduate students.As of 2026
- ProfessorKazuyuki Matsubayashi
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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: “MAXIMATOR-High-Pressure-Manometer-01a” CEphoto, Uwe Aranas / CC BY-SA 3.0 (cropped)
- Pressure Effects and Superconductivity in an Excitonic Insulator: “DiamondAnvilCell 003” National Institute of Standards and Technology / Public domain (cropped)
- Orbital Degrees of Freedom and Heavy-Fermion Superconductivity: “Heavy Fermion CeRhIn5 Cristallographic Structure” Julien Bobroff (user:Jubobroff), LPS, Orsay, France / CC BY-SA 3.0 (cropped)
- Temperature-Pressure Phase Diagrams Under High-Quality High Pressure: “Researcher using diamond anvil cell” Allison Pease, University of Michigan, USA / CC BY-SA 2.5 (cropped)
- Related lab (Ozeki Lab): “Liquid Crystal Phase Transition” KarlGaff / CC BY 4.0 (cropped)
- Related lab (Muranaka Lab): “Levitating superconductor on a hula hoop handled by the physicist Julien Bobroff” Jubobroff / CC BY 4.0 (cropped)
- Related lab (Jin Nakamura Lab): “Superconducting HGMS ACMI-1998” Antonín Ryska / CC0 (cropped)
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