Superconducting Electronics Group


Group Outline and Primary Goal

Superconducting Electronics group promotes the research and development of new superconductors, the elucidation of the mechanism of high-Tc superconductivity through both theoretical and experimental approaches, and application technologies for superconducting devices and new technologies for their realization. We also pursue the research and development for the industrial applications of superconductors.


Key Themes of Research

  1. Development of superconducting materials that have higher Tc, or possess other interesting or useful properties
  2. Design and trial production of copper oxide high temperature superconducting cables for industrial applications
  3. Development of basic technology for industrial use of iron-based high-temperature superconducting materials
  4. Elucidation of the mechanism of superconductivity in high-temperature superconductors represented by copper oxide and iron compound superconductors
  5. Research for the development of new functional substances and new devices, and development of physical property evaluation methods

High-Pressure Synthesis
Here, material synthesis is performed under extreme conditions. This technique is useful in the search for high-throughput materials.

Zone Melting
This is a technique for growing single crystals of materials such as high-Tc cuprates with the largest dimensions and best qualities.

First-Principles Electronic Structure Calculation
The calculation of the electronic structure of abnormal superconducting materials.

High-Pressure Measurement of the Physical Properties
This allows us to alter the structure of materials without introducing disorder; provides a systematic scan of the structural parameter space for the development and optimization of novel materials.

Microscopic and Macroscopic Phenomenology
Simulation of electromagnetic response of striated superconducting tapes

Prototype of superconducting wire using Iron-based superconductor


Our Technologies and Equipment

  • Condensed-matter theory, band calculation
  • Analytical and numerical technique for superconducting phenomena
  • High-pressure material synthesis
  • Single-crystal growth by using floating-zone method, etc.
  • Transport measurement under high pressure
  • Fabrication of superconducting wire

Articles

  • S. Ishida, et al. “Superconductivity-driven ferromagnetism and spin manipulation using vortices in the magnetic superconductor EuRbFe4As4” Proc. Natl. Acad. Sci. USA 118, e2101101118 (2021)
  • A. Iyo et al., “Antiperovskite Superconductor LaPd3P with Noncentrosymmetric Cubic Structure, Inorg. Chem. 60,18017-18023 (2021).
  • A. Iyo et al., “Superconductivity of centrosymmetric and non-centrosymmetric phases in antiperovskite (Ca,Sr)Pd3P” J. Alloys Compd. 882, 160733 (2021).
  • A. Iyo et al.,“Structural phase transitions and superconductivity induced in antiperovskite phosphide CaPd3P”, INORGANIC CHEMISTRY,59,12397(2020)
  • S. Ishida, et al., "Unique defect structure and advantageous vortex pinning properties in superconducting CaKFe4As4", npj Quantum Materials 4, 27 (2019)
  • I. Hase, T. Yanagisawa, Y. Aiura and K. Kawashima; "Possibility of Flat-Band Ferromagnetism in Hole-Doped Pyrochlore Oxides Sn2Nb2O7 and Sn2Ta2O7" Phys. Rev. Lett. 120 (2018) 196401.
  • A. Iyo et al., “New-Structure-Type Fe-Based Superconductors: CaAFe4As4 (A = K, Rb, Cs) and SrAFe4As4 (A = Rb, Cs)“ J. Am. Chem. Soc. 138, 3410 (2016).