Point-contact spectroscopic study on noncentrosymmetric superconductor

2018 Fiscal Year Final Research Report

• Project/Area Number: 16K05450
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Shimane University
• Principal Investigator: MOTOYAMA Gaku 島根大学, 学術研究院理工学系, 准教授 (20360050)
• Co-Investigator(Kenkyū-buntansha): 山口 明 兵庫県立大学, 物質理学研究科, 准教授 (10302639) ; 武藤 哲也 島根大学, 学術研究院理工学系, 准教授 (50312244)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: 空間反転対称 / 点接合分光測定 / 電気磁気効果

Outline of Final Research Achievements

We carried out two study plans to search characteristic phenomena in noncentrosymmetric system. First, we developed a new measurement method of point-contact spectroscopy under high pressure and it was tried to observe a spectrum of superconducting state of CeCoIn5, which is expected to be line-node superconductor. We observed a pressure dependence of spectrum of the superconducting state. On the other hand, observation of the spectrum of Andreev resonant state was not achieved. Second, we carried out a material research for new compounds with noncentrosymmetric crystal structure. In the new compound Ce3TiBi5 discovered by this study, current-induced magnetization due to the ferrotoroidal order, which is predicted by theoretical studies, was observed.

Free Research Field

数物系科学、低温物性測定、物質探索

Academic Significance and Societal Importance of the Research Achievements

近年、発電材料やセンシングデバイス材料などの産業に応用可能な新規材料として、様々な対称性の破れを有した系に注目が集まっている。対称性が破れた系ではこれまで考慮されなかった様々な物理現象が期待されている。これらの新しい現象を観測する手段やそれらが期待できる新しい化合物の発見は、基礎研究から応用研究まで広くすそ野を広げることに貢献できる。