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Prof. Gregory Stewart

RESEARCH INTERESTS OF G. R. STEWART

Iron Pnictide Superconductors:

With the discovery of superconductivity up to Tc=57 K (fueled by the Hosono group's discovery of superconductivity at 26 K in LaFeAsO doped with F), a number of interesting physical questions have been raised.  Chief among these are:  What other compounds with perhaps even higher transition temperature can be found?  What role do non-conventional pairing mechanisms (including spin fluctuations) play in the superconductivity?

We are investigating both known, and as-yet uninvestigated compounds (there are over 800 known systems in the '1111' structure (like LaFeAsO) and the '122' structure (based on BaFe2As2)).  In addition, specific heat as a function of angle and field up to 20 Tesla and down to 0.1 K are either under investigation or being planned.

Our group is involved in a number of ongoing, active collaborations, including research groups in Kyoto University, Los Alamos National Laboratory,  and (starting in 2008) Seoul National University.