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Condensed Matter Seminars

ics Condensed Matter
Thursday, March 14, 2013
11:00 AM
Physics Building, Room 204
Note special room.
Chul-Ho Lee [Host: Seunghun Lee]
National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
"What is an essential factor for determining Tc in Iron Pnictides?
- In terms of crystal structure and spin fluctuations -"
ABSTRACT:
The discovery of superconductivity in LaFeAsO1-xFx at superconducting temperature of Tc = 26K has triggered the energetic study of searching a new superconductor. In an early stage, we reported that Tc attains maximum values when FeAs4-lattices form a regular tetrahedron [1]. Many new iron-based superconductors have been found after the report and most of them really follow the relationship. Recently, we also found that Tc depends on FeAs layer-layer distance as well as Fe-pnictogen bond length. Spin fluctuations can also be an essential factor for the superconductivity. I will summarize recent studies of spin fluctuations using inelastic neutron scattering. The reason and a strategy to get higher Tc will be discussed.
[1] C. H. Lee et al., J. Phys. Soc. Jpn. 77 (2008) 083704.

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