Novel ferromagnetic superconductivity and field-induced phenomena in actinide compounds

2015 Fiscal Year Final Research Report

• Project/Area Number: 25247055
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Tohoku University
• Principal Investigator: AOKI Dai 東北大学, 金属材料研究所, 教授 (30359541)
• Co-Investigator(Kenkyū-buntansha): HONDA Fuminori 東北大学, 金属材料研究所, 准教授 (90391268) ; HOMMA Yoshiya 東北大学, 金属材料研究所, 助教 (00260448) ; LI Dxin 東北大学, 金属材料研究所, 助教 (40281985)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 強磁性超伝導

Outline of Final Research Achievements

We grew high quality single crystals of UGe2, URhGe and UCoGe which show the coexistence of ferromagnetism and superconductivity. Many macroscopic experiments, such as resistivity, specific heat, thermopower, thermal expansion, magnetization and susceptibility, were performed under extreme conditions, namely low temperature, high field and high pressure. Microscopic experiments, such as de Haas-van Alphen experiments, Shubnikov-de Haas experiments, quantum oscillations in thermopower, were also done. We precisely determined temperature-field-pressure phase diagram in these materials, and focused on the field-induced ferromagnetic fluctuations and Fermi surface instabilities, which can be understood as the Lifshitz transition.

Free Research Field

固体物理