2010 Fiscal Year Final Research Report

Search for strongly coupled phonon superconductors by formation of three-dimensional networks of conductive σ-bonds

Research Project

Project/Area Number	21860093
Research Category	Grant-in-Aid for Research Activity Start-up
Allocation Type	Single-year Grants
Research Field	Inorganic materials/Physical properties
Research Institution	The Institute of Physical and Chemical Research
Principal Investigator	KATSURA Yukari The Institute of Physical and Chemical Research, 高木磁性研究室, 基礎科学特別研究員 (00553760)
Project Period (FY)	2009 – 2010
Keywords	超伝導 / 新物質探索 / ホウ化物
Research Abstract	We searched for novel superconductors in compounds with three-dimensional conductive covalent networks. Although no supercondutivity was observed so far, KB6 is one of such compounds, and heavy hole-doping was suggested to be a possible way for superconductivity. We discovered a novel paramagnetic compound Ca3Co4Ge4, with three-dimensional network of Co-Ge covalent bonds. From broad investigation of electronic structures, we designed hypothetical compounds MgFeGe and LiCoGe to reproduce electronic structures of Fe pnictide superconductors.