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Miyakawa Lab
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A lab exploring new materials through single-crystal growth and precision measurements of superconducting materials.
AboutAbout the lab
Probing the mechanism of superconductivity through crystal growth and measurement
The Miyakawa Lab studies the growth of high-purity single crystals of strongly correlated electron materials, centered on superconducting materials, and the search for novel functional materials, including novel superconductors.
The lab also puts effort into clarifying how superconductivity emerges and into discovering and explaining new physical phenomena.
The lab develops and improves high-precision thermal property measurement equipment, as well as point-contact tunneling spectroscopy, and uses them to advance its research.
The lab also grows large single crystals of transparent semiconductors and studies their physical properties.
Key terms
- Superconducting transition temperature
- The temperature at which superconductivity appears. Cuprate superconductors show high values that exceed the temperature of liquid nitrogen.
- Point-contact tunneling spectroscopy
- A measurement technique for directly observing the superconducting gap. This lab has used it to clarify the gap states of cuprates and other materials.
- Charge density wave
- Abbreviated CDW. When it forms, a gap opens at the Fermi surface, so it generally does not coexist with superconductivity.
ResearchResearch themes
The Miyakawa Lab grows high-purity single crystals and searches for new superconductors, working on strongly correlated electron materials centered on superconducting materials. With the aim of clarifying the mechanism of superconductivity, the lab conducts its research using tunneling spectroscopy and high-precision thermal property measurements.
*Illustrative imageResearch on cuprate superconductors
The lab has directly observed the superconducting gap by point-contact tunneling spectroscopy and has studied the gap states of many cuprates. It also grows large, high-quality single crystals by the floating zone (FZ) method and induces superconductivity using electric double layer transistors.
*Illustrative imageResearch on iron-based superconductors
Among iron-based superconductors, the lab focuses on the "11" family, which has no insulating layer. So far, it has clarified the superconducting gap of iron-based superconductors from the viewpoint of tunneling spectroscopy.
*Illustrative imageResearch on bismuth sulfide-based superconductors
The lab developed a precision specific heat measurement system and was the first to clarify the superconducting pairing symmetry from specific heat. Focusing also on the property that the superconducting transition temperature rises sharply under pressure, the lab studies the physical properties under high pressure.
*Illustrative imageResearch on transition metal chalcogenides
The lab focuses on compounds composed of transition metals and chalcogens, aiming to discover new superconductors. In the course of this work, it discovered HfTe3, in which superconductivity and a charge density wave coexist.
MembersFaculty
The members of the Miyakawa Lab consist of faculty members and master's and undergraduate students.As of 2025
- ProfessorNobuaki Miyakawa
- Assistant ProfessorAkito Yanagisawa
VoicesStudent voices
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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 dewar” Alkamid / CC BY-SA 3.0 (cropped)
- Research on cuprate superconductors: “Levitation of a magnet on top of a superconductor 2” Julien Bobroff (user:Jubobroff), Frederic Bouquet (user:Fbouquet), Jeffrey Quilliam, LPS, Orsay, France / CC BY-SA 3.0 (cropped)
- Research on iron-based superconductors: “Iron-based superconductor ( )” Oak Ridge National Laboratory / CC BY 2.0 (cropped)
- Research on bismuth sulfide-based superconductors: “Microflowers of bismuth sulfide” Timuratabaev / CC BY-SA 4.0 (cropped)
- Research on transition metal chalcogenides: “Crystal in VCGS furnace” Marshall Space Flight Center (NASA) / Public domain (cropped)
- Related lab (伊藤研究室): “BURNED OUT SUPERCONDUCTING MAGNET COIL - NARA - 17450109” Martin Brown / Public domain (cropped)
- Related lab (後藤研究室): “3.5 inch hard disk drive, side view” Gunnar Wolf / CC BY-SA 4.0 (cropped)
- Related lab (遠山研究室): “High-Temperature Superconducting Cables ( )” National Institute of Standards and Technology / Public domain (cropped)
- Related lab (齋藤研究室): “Stacja badawcza PEEM” Achrzes / CC BY-SA 4.0 (cropped)
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