Exploration of novel superconducting transport phenomena in Van der Waals superconductors

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K20352
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0202:Condensed matter physics, plasma science, nuclear engineering, earth resources engineering, energy engineering, and related fields
• Research Institution: The University of Tokyo
• Principal Investigator: Itahashi Yuki 東京大学, 大学院工学系研究科(工学部), 助教 (70966407)
• Project Period (FY): 2022-08-31 – 2024-03-31
• Keywords: 超伝導 / ファンデルワールス物質 / 超伝導ダイオード効果 / FFLO相

Outline of Final Research Achievements

We could not observe the rectification effect in the misfit layered superconductor (PbSe)1.14(NbSe2)3, which was proposed at the beginning of the research project.　However, electrical resistance measurements under high magnetic fields revealed anomalies implying an unconventional superconducting phase. Furthermore, by　performing bulk measurement, which is called TDO measurement,　we also succeeded in confirming an anomaly that indicates a phase transition inside the zero resistance state, which could not be obtained by electrical resistance measurements. I am currently writing a paper on this result.　In the future, we hope to verify the magnetic flux motion in (PbSe)1.14(NbSe2)3, and expanding the measuremnt to (PbSe)1.14(NbSe2) and (PbSe)1.14(NbSe2)2.

Free Research Field

ファンデルワールス層状超伝導体

Academic Significance and Societal Importance of the Research Achievements

本研究は消費電力の少ない超伝導エレクトロニクスに向けた超伝導ダイオード素子実現を目指し、超伝導ダイオード効果を示す物質系の開拓及び微視的機構の解明を目標としてきたが、今回副次的に非従来型超伝導相の発見に至った。このような非従来型超伝導がどのような系で見られるか、どのような起源を持つのかといった特性の解明につながることが期待される。