Radiation-induced metastable electronic phase in strongly correlated systems

2017 Fiscal Year Final Research Report

• Project/Area Number: 15H04238
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Nuclear engineering
• Research Institution: Tohoku University
• Principal Investigator: Asai Keisuke 東北大学, 工学研究科, 教授 (60231859)
• Co-Investigator(Kenkyū-buntansha): 越水 正典 東北大学, 工学研究科, 准教授 (40374962)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 超伝導 / 放射線 / ドーピング / Ｘ線

Outline of Final Research Achievements

We investigated the irradiation effects on the conductive and magnetic properties of high-temperature cuprate superconductors with different compositions upon irradiation of ionizing radiations. We observed a rise in the superconductive transition temperature after X-ray irradiation, and this result was consistent with the change in the magnetic properties induced by the irradiation. These results are owing to the hole doping by the irradiation, which generates electron-hole pairs and subsequently electrons are trapped at defect sites such as oxygen vacancies. We successfully demonstrated that the enhancement in the supercnductive properties can be achieved by irradiation of X-ray or gamma-ray, which have high permeability in bulk materials.

Free Research Field

放射線物理化学