Prof. Baskaran, CMT Speaker for May 30, 2012, 2015 PRB

[Reilly, Leah]

Hello all.

Dr. Baskaran from the Perimeter Institute will be our guest CMT seminar speaker on Wednesday, May 30, 2012.  His presentation will be held from 10:30 am to 11:30 pm in 2015 PRB.

Please find the title and abstract for his presentation below:

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"Fe based Superconductors:

A Strong Coupling Perspective"


Abstract: Transition metal compounds have a strong tendency to be a Mott insulator or remain close to it and develop local moments. Iron Arsenide superconductor family is no exception. In this family, tendency to form a Fe spin-1 moment is apparent in the phenomenology.

A recent striking example is the vacancy ordered K_2Fe_4Se_5, where Fe exhibits spin-2 moment. It is believed that this system has coexisting antiferromagetism (T_N ~ 600 K) and superconductivity (T_c ~ 30 K).  Further, Fe based superconductors are similar in many ways to Cuprates and Organic superconductors. Putting all these together, we will present a strong coupling perspective [1,2] for magnetism and superconductivity in Fe based superconductors. In our theory, a reference Mott insulator, which is either externally doped or self doped (due to chemical pressure) plays a fundamental role. A striking consequences of our our theory is that it offers scope for higher superconducting Tc's, competing with cuprates.



            [1] G. Baskaran, J. Phys. Soc. Jap., vol.77 page 113713 (2008)



            [2] G. Baskaran, arXiv:1108.3562

Thank you.

Leah Reilly, MBA
Administrative Associate
reilly.115 at osu.edu<mailto:reilly.115 at osu.edu>
1(614)2923437



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