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Invited Lecturer: Place: (26-27 Oct) 3-201 Conference Room, Department of Physics, POSTECH, Pohang (28 Oct) Seminar room 512, Asia Pacific Center for Theoretical Physics (APCTP), Pohang Period:
October 26 (Mon), 2015 - October 28 (Wed), 2015 14:00-16:00 Abstract:
The discovery of superconductivity in Fe-based superconductors in 2008
with Tc reaching almost 60K is among the most significant breakthroughs
in contemporary condensed matter physics. The experimental data on
superconductivity show rich behavior, with potentially different
symmetry of a superconducting state for different compositions of the
same material. Furthermore, the phase diagram reveals a complex interplay
between magnetism and superconductivity typical for other exotic
superconductors such as cuprates or heavy fermions. The course of the
three lectures encompasses an introduction to various aspects of the
theory of iron-based superconductors. In particular, in the first
lecture I will discuss general aspects of the Cooper-pairing in Fe-based
superconductors. I will argue that the physics is universal and that
all pairing states obtained so far can be understood within the same
universal pairing scenario. In the second lecture I will review the
magnetic ordering in the iron-based parent compounds. I will first
analyze the selection of the experimentally observed magnetic order out
of the degenerate manifold which occurs due to frustration associated
with multiple nesting wave vectors. In addition, in analogy to the J1-J2
model of the localized spins, I will discuss the possibility of an
Ising nematic order to form above the actual Neel temperature and its
coupling to orbital and lattice degrees of freedom.
Topics:
Strongly correlated materials; Novel quantum phenomena, High temperature superconductivity; Organizers:
Contact: Emails: sec(at)apctp.org
Address: Hogil Kim Memorial Bldg. #501, POSTECH
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