Microscopic investigation of the relation between superconductivity and one-dimensional electronic order in iron-based superconductors

2014 Fiscal Year Final Research Report

• Project/Area Number: 24740242
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics II
• Research Institution: The Institute of Physical and Chemical Research (2014); Tokyo University of Science (2012-2013)
• Principal Investigator: MACHIDA Tadashi 独立行政法人理化学研究所, 創発物性科学研究センター, 特別研究員 (60570695)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 鉄系超伝導 / 軌道秩序 / 反強磁性秩序 / 走査型トンネル分光

Outline of Final Research Achievements

In this research, we have investigated the real-space electronic structure in Fe1+dTe1-xSex by scanning tunneling microscope. In a parent material Fe1+dTe, we have found the unidirectional electronic structure and isosceles triangular structure around excess Fe atoms. The spatial symmetries of both electronic structures are identical with that of the underlying AFM order. These results can be well-explained by the theoretical model in which the Fund’s rule on each Fe site dominates the electron hopping process. This suggests that the electronic properties in this system are governed by the strength of Fund’s coupling on each Fe site.

Free Research Field

物性物理　実験