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Condensed Matter Colloquium Thursday, February 10, 2011

Summary: Condensed Matter Colloquium
Thursday, February 10, 2011
2 pm, Room 1201
Refreshments at 1:30 pm in Room 1305F
Taner Yildirim
NIST Center for Neutron Scattering
First-principles investigation of recent novel superconductors:
Fe-pnictides and K-doped Picene
In this talk, I will present a brief review of our first principles studies on two recent novel
superconductors; namely Fe-pnictides (i.e., BaFe2As2, KFe2Se2) and K-doped hydrocarbon
Picene, two totally different systems. For iron-based superconductors, our results clearly
show that the Fe-spin is the key factor controlling many physical properties of the pnictide
systems, including atomic positions, crystal cell size, structural phase transitions, and lattice
vibrations and which provides a strong clue about the superconducting mechanism. In
particular, we show that there are strong and competing magnetic interactions in these systems
that explain both the observed spin-pattern and the structural phase transition. In particular, we
present some new results concerning the spin-resolved electron-phonon coupling in these
systems. In the second part of the talk, I will discuss a long-standing question, namely "Can
simple hydrocarbon molecular solids superconduct?" Unlike many well established high
temperature (Tc) superconductors such as cuprates, M3C60, MgB2 and iron-pnictides, the


Source: Appelbaum, Ian - Department of Physics, University of Maryland at College Park


Collections: Engineering; Materials Science