Material-design-concept for new high-Tc iron-based superconductors utilizing the multi-orbital nature

2015 Fiscal Year Final Research Report

• Project/Area Number: 26800182
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics II
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: IIMURA SOSHI 東京工業大学, 応用セラミックス研究所, 助教 (80717934)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 鉄系超伝導体 / 輸送特性 / 第一原理計算

Outline of Final Research Achievements

Iron-based superconductors, LaFeAsO1-xHx, has the two superconducting (SC) phases and two anti-ferromagnetic (AFM) phases. From the transport properties and first-principle calculations, it was shown that the half-filled state of Fe-3dxy orbital strongly affects the normal-conduction properties, and contributes the appearance of AFM in the proximity of the higher critical temperature (Tc) SC phase. These results indicate that the high-Tc superconductivity may emerge in the proximity of the half-filled state of Fe-3dxy, which provides a new design concept for the high-Tc superconductor.

Free Research Field

固体化学、高圧合成、超伝導